*TM 10-8470-204-10 TECHNICAL MANUAL OPERATOR`S
Contents
1. Pad Configurations Pad Suspension Adjustment Sizing and Fitting Troubleshooting vss Donning and Doffing eene Removing and Replacing the Chinstrap Retention System tra ai ANS ats Attaching Helmet Cover ou Front Bracket Assembly Kit Installation Eyewear Retention Strap Installation Configuration for Airborne Operations CHAPTER 3 MAINTENANCE PROCEDURES Replacing the Hardware en Replacing the Pad Suspension Cleaning Instructions n Preventive Maintenance Checks and Services CHAPTER 4 SUPPORTING INFORMATION References eiie npe nien nien eei ene Components of End Item and Basic Issue ems iS irr mter ERR Expendable and Durable Items List vos Tool Identification List neee Associated and Repair Items List Record f Hit 0002 00 0003 00 0004 00 0005 00 0006 00 0007 00 0008 00 0009 00 0010 00 0011 00 0012 00 0013 00 0014 00 0015 00 0016 00 0017 00 0018 00 0019 00 0020 00 0021 00 0022 00 0023 00 10 8470 204 10 HOW TO USE THIS MANUAL OVERVIEW This manual contains operating instructions and maintenance procedures for the Advanced Combat Helmet ACH This manual is divided into the following major sections Fr2. 10 8470 204 10 TECHNICAL MANUAL OPERATOR S MANUAL FOR ADVANCED COMBAT HELMET ACH DISTRIBUTION STATEMENT A Approved for public release distribution is unlimited This manual supercedes TM 10 8470 204 10 dated 30 November 2002 including all changes HEADQUARTERS DEPARTMENT OF THE ARMY 31 MAY 2004 WARNING SUMMARY This warning summary contains general safety warnings and hazardous materials warnings that must be understood and applied during operation and maintenance of this equipment Failure to observe these precautions could result in serious injury or death to personnel WARNING All seven 7 helmet pads must be worn during airborne operations and should be worn during other high risk operations such as air assault and rappelling mountaineering Failure to observe this precaution could result in serious injury or death because all seven 7 pads provide maximum impact protection WARNING The hardware p clamp ladder lock screw and nut inside the helmet where the chinstrap retention system webbing attaches to the helmet shell must be covered by padding during airborne and other high risk operations such as air assault and rappelling mountaineering The oblong oval pad must be placed flush with the rim edge of the helmet and completely cover the hardware See illustration Pad Placement over Hardware Front and Pad Placement over Hardware Rear Failure to observe this precaution could result i
3. 0004 00 1 10 8470 204 10 0004 00 Step 3 Measure head width Measurement is best made with a caliper If no caliper is available an approximate measurement can be made using a tape measure aligned with each side of head as shown Record size measured Arrows denote the proper alignment of the caliper or tape measure Nu jus Step 4 Measure head circumference Record size measured Subject sits erect with head level Measure circumference by passing tape measure just above the bony eyebrow ridges of the forehead and above both ears The tape measure must be pulled tight 0004 00 2 10 8470 204 10 0004 00 Step 5 Using the chart below select the helmet size based on the largest of the 3 measurements If a measurement falls on the dividing line between the two sizes select the larger size This is the proper shell size for the soldier measured NOTE If any measurement falls on the dividing line between sizes select the larger size Head Shell Sizing Chart Head Circumference Up to 7 Up to 22 inches inches 198 mm 573 mm Up to 6 inches From 7 34 From 22 Y inches 162 mm inches 198 mm 573 mm up to 8 up to 23 Y inches inches 210 mm 597 mm 6 8 inches inches 210 mm 162 mm and over and over 23 inches 597 mm and over 0004 00 3 10 8470 204 10 0004 00 ACH Pad Sizing Two size pads are available a size 6 thinner and a size 8
4. 8470 01 506 6855 34 Post Helmet for attaching NVG Front Bracket Assembly box of 50 8470 01 144 5367 35 Screw Machine 8 32 x 3 8 in long for plugging front NVG hole hd 5305 00 182 9265 36 Screw Set Mounting includes 4 p clamps 4 ladder locks 4 bolts 4 nuts MSA 300107A set 8470 01 476 5631 37 Strap Chin Retention size M L ea 8470 01 476 2605 38 Strap Chin Retention size XL ea 8470 01 519 4200 39 Strap Eyewear Retention pr 0022 00 4 8470 01 487 1605 10 8470 204 10 0023 00 SUPPORTING INFORMATION OPERATOR RECORD OF HIT OPERATOR RECORD OF HIT Name Rank Serial Unit Phone HELMET Size Date of Issue l Duty Being Performed When Hit Hit Caused by circle Fragmentation Mine Grenade Booby Trap Artillery Other Date of Hit Estimated range from point of detonation Location of Hit s on Advanced Combat Helmet Continued to Perform Mission circle one Yes No Was Personal Injury Sustained circle one Yes No Description of Injury 0023 00 1 10 8470 204 10 0023 00 OPERATOR RECORD OF HIT cont d Mail Record of Hit to postal address or responses to electronic mail address Postal Address Commander U S Army Soldier and Biological Chemical Command ATTN AMSRD NSC IP A Kansas Street Natick MA 01760 Electronic Mail Address
5. thicker To select pad size 1 Assemble helmet in standard pad configuration see Pad Configuration in WP 0005 00 If other equipment is to be used with the helmet such as headset microphone evaluate size with that equipment if possible 2 Try on helmet and evaluate fit Proper fit is achieved when the helmet does not sit too high crown pad dos not contact head or too much of forehead is exposed or too low too low on brow or not compatible with eyewear etc and is not too tight or too loose see Sizing and Fitting Troubleshooting in WP 0007 00 Shake head rapidly from side to side to check for stability Helmet should not rotate from side to side when head is shaken While evaluating fit be sure to have the chinstrap retention system cinched down END OF WORK PACKAGE 0004 00 4 10 8470 204 10 0005 00 OPERATION UNDER USUAL CONDITIONS PAD CONFIGURATIONS This work package provides instructions for different pad configurations Standard Pad Configuration All seven 7 pads are worn when first trying on the helmet for sizing and fitting and for airborne and other high risk operations see configuration for airborne operations in WP 0013 00 for additional information 1 ea circular crown pad 4 ea oval oblong side pads front of helmet 2 ea Trapezoidal Pads one front and one back Standard Pad Configuration 0005 00 1 10 8470 204 10 0005 00 Alternate Pad Configurations Alternate pad confi
6. 002200 Nomenclature U l NSN Cover Helmet Reversible woodland desert without communication flap size M L ea 8415 01 506 6729 Cover Helmet Reversible woodland desert without communication flap size S M ea 8415 01 515 4671 Cover Helmet Reversible woodland desert without communication flap size L XL ea 8415 01 515 4674 Cover Helmet Non reversible white without communication flap size M L ea 8415 01 506 6731 Cover Helmet Non reversible white without communication flap size S M ea 8415 01 515 4289 Cover Helmet Non reversible white without communication flap size L XL ea 8415 01 515 4290 Fastener tape Hook hook disks roll of 500 8470 01 506 6742 Helmet Advanced Combat green with one NVG mounting hole size medium shell size 6 pads ea 8470 01 506 6369 0022 00 2 10 8470 204 10 002200 Nomenclature U l NSN Helmet Advanced Combat green with one NVG mounting hole size medium shell size 8 pads ea 8470 01 506 6373 Helmet Advanced Combat green with one NVG mounting hole size large shell size 6 pads ea 8470 01 506 6375 Helmet Advanced Combat green with one NVG mounting hole size large shell size 8 pads ea 8470 01 506 6377 20 21 Helmet Advanced Combat green with one NVG mounting hole size extra large
7. be routed horizontally to make a seal around the user s head This configuration is better suited for cold weather environments See Pad Configurations in WP 0005 00 END OF WORK PACKAGE 0006 00 3 4 Blank 10 8470 204 10 0007 00 OPERATION UNDER USUAL CONDITIONS SIZING AND FITTING TROUBLESHOOTING This work package provides sizing and fitting troubleshooting techniques 1 If helmet is too tight Try arranging side pads in a horizontal configuration or diagonal direction see pad configuration illustrations in WP 0005 00 If rearranging the pads does not alleviate the tightness try the next smaller pad size Try removing front pad and rearranging side pads to create space in the area you felt tightness see pad configuration illustrations in WP 0005 00 Helmet too tight 0007 00 1 10 8470 204 10 0007 00 2 If too loose Shake head from side to side while eyes are closed If helmet slides on head it is too loose Try a larger thicker pad set Select the next smaller shell size Increase the number of pads in shell Helmet too loose 0007 00 2 10 8470 204 10 0007 00 3 If too high i e too much forehead exposed crown and does not touch top of head or wearer does not see edge of rim Try smaller thinner sized pad set Try rearranging pads horizontal or diagonal see pad configuration illustrations in WP 0005 00 Try a larger shell size It is extreme
8. in column 2 Column 6 Qty Rar Indicates the quantity required Components of End Item 1 2 3 4 5 6 Illus National Stock Description Usable QTY Num Number CAGEC and on ber Part Number Code 8470 01 476 2605 Strap Chin N A ea 1 Retention 8470 01 476 5643 Pad N A set 1 Suspension System ACH set of size 6 pads 8470 01 476 5648 Pad N A set 1 Suspension System ACH set of size 8 pads 0019 00 2 10 8470 204 10 Basic Issue Items BIl List 0019 00 1 Illus Num ber 2 National Stock Number 3 Description CAGEC and Part Number 4 Usable on Code 5 un 6 QTY 8415 01 487 1612 Cover Helmet Reversible woodland desert with communication flap size M L N A 8415 01 515 4662 Cover Helmet Reversible woodland desert with communication flap size S M N A ea 8415 01 515 4663 Cover Helmet Reversible woodland desert with communication flap size L XL N A ea 8415 01 476 6066 Cover Helmet Non reversible white with communication flap size M L N A ea 8415 01 515 4286 Cover Helmet Non reversible white with communication flap size S M N A ea 0019 00 3 10 8470 204 10 Basic Issue Items BII List Cont d 0019 00 1 Illus Num ber 2 National Stock Number 3 Des
9. shell size 6 pads Helmet Advanced Combat green with one NVG mounting hole size extra large shell size 8 pads ea ea 8470 01 513 6411 8470 01 513 6414 22 Helmet Parts Kit includes 9 sets of size 6 pads 1 set of size 8 pads 400 fastener tapes hook disks 10 chinstrap retention systems 10 mounting screw set and 10 reversible covers kit 8470 01 506 6721 23 Ladder Lock Helmet Advanced Combat box of 50 8470 01 506 6451 24 Mounting Screw Helmet Advanced Combat box of 50 8470 01 506 6503 25 Nut Helmet Advanced Combat box of 50 8470 01 506 6488 26 Pad Suspension System ACH set of size 6 pads set 8470 01 476 5643 0022 00 3 10 8470 204 10 002200 Nomenclature U l NSN 27 Pad Suspension System ACH set of size 8 pads set 8470 01 476 5648 28 Pad Helmet Advanced Combat circular crown pad size 6 ea 8470 01 506 6626 29 Pad Helmet Advanced Combat circular crown pad size 8 ea 8470 01 506 6627 30 Pad Helmet Advanced Combat oblong oval pad size 6 ea 8470 01 506 6454 31 Pad Helmet Advanced Combat oblong oval pad size 8 ea 8470 01 506 6456 32 33 Pad Helmet Advanced Combat trapezoidal pad size 6 Pad Helmet Advanced Combat trapezoidal pad size 8 ea ea 8470 01 506 6851
10. 001 0023 0 Authentication Pg 0 Electronic 2028 Instructions 0 Zero in this column indicates an original page A B Blank 10 8470 204 10 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON D C 31 May 2004 TECHNICAL MANUAL OPERATOR S MANUAL FOR ADVANCED COMBAT HELMET ACH REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS You can help improve this manual If you find any mistakes or if you know of a way to improve the procedures please let us know Mail your letter DA form 2028 Recommended Changes to Publications and Blank Forms or DA Form 2028 2 directly to Commander U S Army Tank automotive amp Armament Command ATTN AMSTA LC CECT Kansas St Natick MA 01760 You may also submit your recommended changes by E mail directly to amssbriml natick army mil A reply will be furnished directly to you Instructions for sending electronic 2028 may be found at the back of this manual DISTRIBUTION STATEMENT A Approved for public release distribution is unlimited TABLE OF CONTENTS WP Sequence No WARNING SUMMARY ii a HOW TO USE THIS MANUAL n iii GENERAL INFORMATION 0001 00 10 8470 204 10 TABLE OF CONTENTS Cont CHAPTER 1 DESCRIPTION AND THEORY OF OPERATION Equipment Description and Data Theory of Operation i CHAPTER 2 OPERATOR INSTRUCTIONS Sizing and Fitting Instructions
11. 04 10 0009 00 Routing of Chinstrap Webbing through Ladder Lock END OF WORK PACKAGE 0009 00 2 10 8470 204 10 0010 00 OPERATION UNDER USUAL CONDITIONS ATTACHING HELMET COVER This work package provides instructions for attaching the camouflage helmet cover to your ACH There are two covers available for the ACH a reversible woodland desert cover and a white Artic cover front of helmet buttonholes on facing communications flap hook and loop retaining tabs Helmet Cover Inside Helmet Cover Outside Back 1 Remove the suspension pads from the inside of the helmet shell 2 Remove the chinstrap retention system webbing see WP 0009 00 LEAVE THE HARDWARE P CLAMPS AND LADDER LOCKS ATTACHED TO THE SHELL 3 Select the camouflage pattern to be worn and orient the cover so that the desired pattern is on the outside if using the reversible cover 4 Align the label found on rear of helmet cover with the rear of the helmet shell 0010 00 1 10 8470 204 10 0010 00 5 Pull the cover over the back and sides of helmet shell 6 Thread each ladder lock through the corresponding buttonhole in the cover 7 Pull the cover retaining tabs down and attach tabs to hook disks inside helmet shell Ensure tight smooth fit of cover by pulling the retaining tabs until tight 8 Place suspension pads back into shell See WP 0005 00 9 Replace chinstrap retention system webbing See WP 0009 00 for instruc
12. 204 10 snap stud snap socket nut screw hole in eyewear retention strap p clamp hole in helmet shell Eyewear Retention Strap and Screw Assembly 0012 00 2 10 8470 204 10 001200 eyewear retention strap helmet cover screw shown under cover lower most rear buttonhole Helmet with Eyewear Retention Strap Installed 0012 00 3 4 Blank 10 8470 204 10 0013 00 OPERATION UNDER USUAL CONDITIONS CONFIGURATION FOR AIRBORNE OPERATIONS This work package provides instructions for configuring the ACH for airborne operations as well as other high risk operations such as air assault and rappelling mountaineering No other parts or components are required for airborne use of the helmet WARNING The hardware p clamp ladder lock screw and nut inside the helmet where the chinstrap retention system webbing attaches to the helmet shell must be covered by padding during airborne and other high risk operations such as air assault and rappelling mountaineering The oblong oval pad must be placed flush with the rim edge of the helmet and completely cover the hardware See illustration Pad Placement over Hardware Front and Pad Placement over Hardware Rear Failure to observe this precaution could result in serious injury or death to personnel because a hard point could contact the wearer s head WARNING All seven 7 helmet pads must be worn during airborne operations and should be worn during
13. 7 00 3 0017 00 Pads torn cut or otherwise damaged Gouges scrapes cracks delamination or other damage extends below the surface below the paint Edging is excessively loose or damaged Hook disks are damaged such that they will not securely hold the pads in place 4 5 During 6 After TM 10 8470 204 10 Cover Chinstrap Retention System Chinstrap Retention System Hardware Pads Shell Cuts frays or other damage to the fabric or cut or frayed stitching Refer to higher level maintenance for repair Inspect for damaged components see Item 1 Perform all PMCS steps in Items 1 4 after use 0017 00 Excessive cuts frays or other damage to the fabric or cut or frayed stitching Chinstrap components are damaged See above END OF WORK PACKAGE 0017 00 4 4 SUPPORTING INFORMATION FOR ADVANCED COMBAT HELMET ACH 10 8470 204 10 0018 00 SUPPORTING INFORMATION REFERENCES This work package lists related field manuals forms technical manuals and miscellaneous publications FIELD MANUALS FM 3 5 Tactics of Chemical Warfare FM 21 11 First Aid for Soldiers FM 3 21 220 Static Line Parachuting Techniques and Training FORMS DA Form 2028 Recommended changes to Publications and Blank Forms SF 368 Product Quality Deficiency Report TECHNICAL MANUALS TM 10 8400 203 23 Unit and Direct Suppor
14. Check number and placement of pads see pad illustrations in WP 0005 00 Step 2 Prior to donning helmet loosen all adjustment straps 2 ladder locks in front 2 ladder locks in back and the nape pad Unbuckle chinstrap buckle ladder lock ladder lock chinstrap buckle 0008 00 1 10 8470 204 10 0008 00 Step 3 Position helmet on head and buckle chinstrap Hold helmet in place with one hand on top of helmet for initial adjustment WARNING If you pull too tightly on any strap during Steps 4 and 5 or if you don t position helmet on head and hold in place with one hand on top of helmet for initial adjustment as instructed in Step 3 the helmet may become uncomfortable and tilted on your head and chin cup may become un centered Step 4 Partially tighten 2 back adjustment straps one side at a time 0008 00 2 10 8470 204 10 0008 00 Step 5 Partially tighten 2 front adjustment straps one side at a time Step 6 With both hands fully tighten front and back adjustment straps 0008 00 3 10 8470 204 10 0008 00 Step 7 The nape pad can be can be slid up and down along the rear legs of the chinstrap It can be positioned according to personal comfort When tightened see figure below against the nape by pulling on end of webbing the nape pad adds additional stability to the helmet such as when wearing NVGs Keep the nape pad away from the ladder locks while adjusting the chinst
15. KAGE 0001 00 1 2 Blank 1 DESCRIPTION AND THEORY OF OPERATION FOR ADVANCED COMBAT HELMET ACH 10 8470 204 10 000200 ADVANCED COMBAT HELMET EQUIPMENT DESCRIPTION AND DATA EQUIPMENT CHARACTERISTICS CAPABILITIES AND FEATURES The ACH is a helmet system that provides ballistic and impact protection This system is compatible with the current night vision devices NVG s communications packages and nuclear biological and chemical NBC defense equipment and body armor The ACH provides ballistic protection within the full spectrum of operational environments The ACH allows maximum sensory and situational awareness for the operator This includes an unobstructed field of view and increased ambient hearing capabilities The ACH s chinstrap retention system and pad suspension system provides unsurpassed balance stability and comfort This system provides for proper size fit and ventilation The ACH s pad suspension system provides impact protection throughout all operational scenarios including static line airborne operations 0002 00 1 10 8470 204 10 000200 DESCRIPTION OF MAJOR COMPONENTS The Advanced Combat Helmet is made up of the following major components which are illustrated below helmet shell pad suspension system chinstrap retention system with hardware helmet cover eyewear retention strap helmet cover pad suspension system helmet shell c
16. ON EXPENDABLE AND DURABLE ITEMS LIST INTRODUCTION Scope This work package lists expendable and durable items that you will need to operate and maintain the Advanced Combat Helmet This list is for information only and is not authority to requisition the listed items These items are authorized to you by CTA 50 970 Expendable Durable Items Except Medical Class V Repair Parts and Heraldic Items or CTA 8 100 Army Medical Department Expendable Durable Items Explanation of Columns in the Expendable Durable Items List Column 1 Item Number This number is assigned to the entry in the list and is referenced in the narrative instructions to identify the item e g Use brake fluid item 5 WP 0098 00 Column 2 Level This column identifies the lowest level of maintenance that requires the listed item include as applicable C Operator Crew O Unit AVUM F Direct Support AVIM H General Support D Depot Column 3 National Stock Number NSN This is the NSN assigned to the item which you can use to requisition it Column 4 Item Name Description Commercial and Government Entity Code CAGEC and Part Number P N This column provides the other information you need to identify the item Column 5 Unit of Issue Indicates the physical measurement or count of the item as issued per the National Stock Number shown in column 3 0020 00 1 10 8470 204 10 Table 1 Expendable and Durable It
17. assembly and fitting instructions and the operating instructions Chapter 2 Perform maintenance procedures Chapter 3 on a regular basis Always follow the WARNINGS and CAUTIONS 10 8470 204 10 000100 ADVANCED COMBAT HELMET GENERAL INFORMATION SCOPE This manual covers the basic fitting and use instructions for the Advanced Combat Helmet ACH hereafter referred to as the ACH or the helmet MAINTENANCE FORMS RECORDS AND REPORTS Department of the Army forms and procedures used for equipment maintenance will be those prescribed by DA PAM 738 750 Functional Users Manual for the Army Maintenance Management System TAMMS REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS EIR If your helmet needs improvement let us know Send us an EIR You the user are the only one who can tell us what you don t like about your equipment Let us know why you don t like the design or performance Also please report any quality deficiencies or product defects Put it on an SF 368 Product Quality Deficiency Report Mail it to Commander U S Army Tank automotive and Armament Command ATTN AMSTA LC R Kansas Street Natick MA 01760 5052 We will send you a reply MOST CURRENT VERSION OF THIS MANUAL The most current version of this manual may be found at http www logsa army mil etms online htm LIST OF ABBREVIATIONS ACRONYMS Components of End Item Basic Issue Items BII Advanced Combat Helmet ACH END OF WORK PAC
18. cription CAGEC and Part Number 4 Usable on Code 5 un 5 QTY 8415 01 515 4288 Cover Helmet Non reversible white with communication flap size M L N A ea 8415 01 506 6729 Cover Helmet Reversible woodland desert without communication flap size M L N A ea 8415 01 515 4671 Cover Helmet Reversible woodland desert without communication flap size S M N A ea 8415 01 515 4674 Cover Helmet Reversible woodland desert without communication flap size L XL N A ea 8415 01 506 6731 Cover Helmet Non reversible white only without communication flap size M L N A ea 0019 00 4 10 8470 204 10 Basic Issue Items List Cont d 0019 00 1 Illus Num ber 2 National Stock Number 3 Description CAGEC and Part Number 4 Usable on Code 5 Un 6 QTY 8415 01 515 4289 Cover Helmet Non reversible white without communication flap size M L N A ea 8415 01 515 4289 8415 01 515 4290 Cover Helmet Non reversible white without communication flap size S M Cover Helmet Non reversible white without communication flap size L XL N A N A END OF WORK PACKAGE 8470 01 487 1605 Strap Eyewear Retention 0019 00 5 6 Blank N A ea 10 8470 204 10 002000 SUPPORTING INFORMATI
19. e the cover around to line up the buttonhole in the cover 4 Insert the screw through the front bracket assembly cover and into shell from the outside of the helmet Insert the threaded post from inside the helmet Start to tighten the screw and post see Front Bracket Assembly Positioned Helmet illustration in this work package 5 Before completely tightening the screw ensure that the cleat of front bracket assembly is tight against the rim of the helmet see Front Bracket Assembly Positioned Helmet illustration in this work package Push the bracket up so that the cleat is tight against the rim edge of the helmet while tightening the screw and post It may be helpful to have another person assist with this step CAUTION Do not over tighten the screw or the front bracket assembly may break 0011 00 2 Screw located the outside of the helmet and inserted thru front bracket assembly and helmet cover into hole in the shell TM 10 8470 204 10 0011 00 Post located on helmet cover the inside of helmet and inserted into hole in the ensure cleat of front bracket assembly rim edge of is tight against rim helmet under edge cover of helmet Front Bracket Assembly Positioned on Helmet 0011 00 3 10 8470 204 10 001100 If no Front Bracket is used and the helmet has hole for front bracket plug hole with 8 32 x 3 8 long screw and post See WP 0021 00 Ass
20. een reduced when compared to the Helmet Ground Troops and Parachutists This enables better situational awareness through improved field of vision and hearing The shell provides ballistic protection The pads act as a suspension system providing sizing and fitting In conjunction with the shell the pad suspension system provides impact protection In conjunction with the chinstrap retention system the pad suspension system provides stability The chinstrap retention system is a four point design attaching to the shell at four locations In conjunction with the pad suspension system it provides improved stability END OF WORK PACKAGE 0003 00 1 2 Blank 2 OPERATOR INSTRUCTIONS FOR ADVANCED COMBAT HELMET ACH 10 8470 204 10 0004 00 OPERATION UNDER USUAL CONDITIONS SIZING AND FITTING INSTRUCTIONS This work package provides instructions for choosing the proper size ACH ACH Shell Sizing Head Measuring Procedure Use tape measure and caliper to make the following measurements See WP 0020 00 Expendable and Durable Items List for appropriate NSNs Step 1 Subject must be seated in upright position Step 2 Measure head length Measurement is best made with a caliper If caliper is not available an approximate measurement can be made using a tape measure aligned with the front and back of head as shown Record size measured Arrows denote the proper alignment of the caliper or tape measure
21. ems List 0020 00 1 2 3 4 5 ITEM LEV NATIONAL ITEM NAME U I EL STOCK DESCRIPTION NUMBER CAGEC PART NUMBER 1 5210 01 434 0493 Caliper 2 Cloth ea 3 8315 00 782 3520 Measuring tape ea 4 Mild Soap ea 5 Soft Brush ea 6 8030 01 104 5392 Sealing Compound bx END OF WORK PACKAGE 0020 00 2 10 8470 204 10 002100 SUPPORTING INFORMATION TOOL IDENTIFICATION LIST INTRODUCTION Scope This work package lists all common tools and supplements and special tools fixtures needed to maintain the ACH Explanation of Columns in the Tool Identification List Column 1 Number This number is assigned to the entry in the list and is referenced in the initial setup to identify the item e g Extractor item 32 WP 0090 00 Column 2 Name This column lists the item by noun nomenclature and other descriptive features e g Gage belt tension Column 3 National Stock Number This is the National Stock Number NSN assigned to the item use it to requisition the item Column 4 Part Number CAGEC Indicates the primary number used by the manufacturer individual company firm corporation or Government activity which controls the design and characteristics of the item by means of its engineering drawings specifications standards and inspection requirements to identify an item or range of items The manufacturer s Commercial and Govern
22. gurations are allowed to obtain a better fit or more comfort Pads can be placed in vertical or horizontal directions as shown in illustrations or a combination or at an angle between horizontal and vertical diagonal Up to two pads oblong oval or trapezoidal can be removed in non risk situations The circular crown pad must always remain in the helmet Pads should be placed around the inside of the helmet to provide optimum comfort and stability It is best to cover hardware with pads in all situations However hardware MUST be covered with pads in high risk situations The following illustrations show alternate configurations For reasons of clarity only each of the illustrations shows pads in either horizontal or vertical positions but not in diagonal positions However the pads can be placed diagonally at any angle 0005 00 2 10 8470 204 10 0005 00 front of helmet horizontal pad direction vertical pad direction Five Pad Configuration The five pad configuration is useful in hot climates 0005 00 3 10 8470 204 10 0005 00 front of helmet horizontal pad direction vertical pad direction Six Pad Configuration The six pad configuration is useful for wearer s who have long heads or when wearing protective masks 0005 00 4 10 8470 204 10 0005 00 horizontal pad direction vertical pad direction front of helmet Seven Pad Configuration The seve
23. hinstrap retention system with hardware eyewear retention strap Major Components 0002 00 2 10 8470 204 10 000200 hook disks Helmet Shell 0002 00 3 10 8470 204 10 000200 circular crown pad oblong oval pad trapezoidal pad Pad Suspension System 0002 00 4 10 8470 204 10 000200 elastic band elastic band hardware TT nape pad buckle chin cup Chin Strap Retention System with Hardware 0002 00 5 0002 00 10 8470 204 10 000200 front of helmet cover retaining tab communications flap rear of helmet Helmet Cover 0002 00 7 10 8470 204 10 000200 snap socket snap stud O hole to mount to helmet shell Eyewear Retention Strap 0002 00 8 10 8470 204 10 000200 The following used in certain operations chemical protective cover helmet band END OF WORK PACKAGE 0002 00 9 10 Blank 10 8470 204 10 0003 00 ADVANCED COMBAT HELMET THEORY OF OPERATION This work package discusses theory of operation and protective qualities of the ACH This ACH is designed to provide the Soldier with ballistic and impact protection It is compatible with night vision communications and Nuclear Biological and Chemical NBC equipment The ACH weighs approximately 3 Ibs for the size medium 3 25 Ibs for the size large and slightly more than 3 6 Ibs for the extra large The edge cut of the shell has b
24. http www sbccom army mil feedback index htm END OF WORK PACKAGE 0023 00 2 By Order of the Secretary of the Army PETER J SCHOOMAKER General United States Army Chief of Staff Official pol BALD JOEL B HUDSON Administrative Assistant to the Secretary of the Army 0413105 Distribution To be distributed in accordance with initial distribution number IDN 256758 requirements for TM 10 8470 204 10 These the instructions for sending an electronic 2028 The following format must be used if submitting an electronic 2028 The subject line must be exactly the same and all fields must be included however only the following fields are mandatory 1 3 4 5 6 7 8 9 10 13 15 16 17 and 27 From Whomever lt whomever avma27 army mil gt To amssbriml natick army mil Subject DA Form 2028 1 From Joe Smith 2 Unit home 3 Address 4300 Park 4 City Hometown 5 St MO 6 Zip 77777 7 Date Sent 19 OCT 93 8 Pub no 55 2840 229 23 9 Pub Title TM 10 Publication Date 04 JUL 85 11 Change Number 7 12 Submitter Rank MSG 13 Submitter FName Joe 14 Submitter MName T 15 Submitter LName Smith 16 Submitter Phone 123 123 1234 17 Problem 1 18 Page 2 19 Paragraph 3 20 Line 4 21 NSN 5 22 Reference 6 23 Figure 7 24 Table 8 25 Item 9 26 Total 123 27 Text This is the text for the problem below line 27 PIN 080445 000
25. l 1 Clean with mild soap and water Use a soft brush or cloth 2 Allow to air dry A small brush is useful in removing dirt from the hook disks on the inside of the shell Chinstrap Helmet Cover and Pad Suspension 1 Clean with mild soap and water Wash by hand or in machine in the gentle cycle cold water 2 Allow to air dry DO NOT MACHINE DRY Keeping the hook and loop clean will help to maintain its ability to stick together END OF WORK PACKAGE 0016 00 1 2 Blank 10 8470 204 10 0017 00 MAINTENANCE PROCEDURES PREVENTIVE MAINTENANCE CHECKS AND SERVICES Introduction General Preventive maintenance checks and services PMCS are performed to keep the ACH in operating condition The checks are used to find correct and report problems The operator is to do the PMCS tasks shown in PMCS Table 1 PMCS is to be done before during and after use of the ACH Before you use the ACH perform PMCS During use of the ACH periodically perform PMCS After you have used the ACH perform PMCS PMCS Column Description ITEM The order the PMCS should be performed and a reference number for maintenance forms INTERVAL Tells when the check should be performed ITEM TO BE CHECKED OR SERVICED Tells which items to perform the PMCS procedure on PROCEDURE Tells the procedure to perform If item cannot be repaired it must be replaced EQUIPMENT NOT READY IF Tells what conditions render the ACH unfit to perf
26. ly important that the helmet not be sized and fitted to sit too high on the head Here are some things to look for If too much of forehead is exposed approximately more than inch above eyebrow then the helmet is too high too much forehead exposed Helmet too high too much forehead exposed 0007 00 3 10 8470 204 10 0007 00 If crown pad does not hit head wearer cannot feel pad then helmet may be too high space between pad and head Helmet too high Crown pad not touching head 0007 00 4 10 8470 204 10 0007 00 When fitting have subject look upward by moving eyes but without moving head If subject cannot see rim of helmet helmet may be too high wearer cannot see rim Helmet too high looking past rim 0007 00 5 10 8470 204 10 0007 00 4 If too low i e helmet too low on brow helmet not compatible with eyewear or has other similar compatibility issues Try larger thicker pad set Try rearranging pads horizontal or diagonal see pad configuration illustrations in WP 0005 00 Try a smaller helmet shell rim interferes with vision and eyewear Helmet too low 0007 00 6 10 8470 204 10 0008 00 OPERATION UNDER USUAL CONDITIONS DONNING AND DOFFING This work package provides instructions for donning and doffing the helmet including adjusting the chinstrap to optimize fit and comfort Donning To don put on the helmet Step 1
27. ment Entity Code CAGEC is also included Column 5 Reference This column identifies the authorizing supply catalog or RPSTL for items listed in this work package 0021 00 1 10 8470 204 10 0021 00 Item Item Name National Part Reference No Stock Number Number CAGEC 1 Screwdriver 0021 00 2 10 8470 204 10 SUPPORTING INFORMATION ASSOCIATED AND REPAIR ITEMS LIST 0022 00 This work package lists the associated and repair items you will need to operate and maintain the Advanced Combat Helmet ACH Nomenclature U l NSN 1 2 Bracket Lever NVG Clamp P Helmet Advanced Combat Kit Front Bracket Assembly box of 50 5430 01 509 1467 8470 01 506 6625 3 Cover Helmet Reversible woodland desert with communication flap size M L Cover Helmet Reversible woodland desert with communication flap size S M ea ea 8415 01 487 1612 8415 01 515 4662 Cover Helmet Reversible woodland desert with communication flap size L XL 8415 01 515 4663 Cover Helmet Non reversible white with communication flap size M L 8415 01 476 6066 Cover Helmet Non reversible white with communication flap size S M Cover Helmet Non reversible white with communication flap size M L ea ea 8415 01 515 4286 8415 01 515 4288 0022 00 1 10 8470 204 10
28. n pad configuration is the standard configuration and offers the most impact protection and is required for airborne operations 0005 00 5 6 Blank 10 8470 204 10 0006 00 OPERATION UNDER USUAL CONDITIONS PAD SUSPENSION ADJUSTMENT This work package provides information about the adjusting the pad suspension system This unique suspension system is fully adjustable The system has the following requirements and restrictions WARNING The hardware p clamp ladder lock screw and nut inside the helmet where the chinstrap retention system webbing attaches to the helmet shell must be covered by padding during airborne and other high risk operations such as air assault and rappelling mountaineering The oblong oval pad must be placed flush with the rim edge of the helmet and completely cover the hardware See illustration Pad Placement over Hardware Front and Pad Placement over Hardware Rear Failure to observe this precaution could result in serious injury or death to personnel because a hard point could contact the wearer s head oblong oval pad hardware Pad Placement over Hardware Front 0006 00 1 10 8470 204 10 0006 00 hardware rim edge of helmet ar P mE S trapezoidal pad BE Md oblong oval pad Pad Placement over Hardware Rear WARNING All seven 7 helmet pads must be worn during airborne operations and should be worn during other high risk operations such as ai
29. n serious injury or death to personnel because a hard point could contact the wearer s head WARNING In order to maximize ventilation reduction of NO MORE THAN 2 pads is authorized in non risk situations WARNING If you experience fit problems tightness looseness or helmet profile is too high or too low refer to Sizing and Fitting Troubleshooting guidelines WARNING When donning the helmet for the first time in a cold environment it is necessary to wear the helmet for a few minutes or otherwise warm the pads such as by placing in pockets so that the pads will conform to the shape of your head As the pads warm up and conform to the shape of your head it may be necessary to retighten the chinstrap retention system WARNING If you pull too tightly on any strap during steps 3 and 4 or if you don t position helmet on head and hold in place with one hand on top of helmet for initial adjustment as instructed in Step 2 the helmet may become uncomfortable and tilted on your head and chin cup may become un centered WARNING For first aid treatments refer to FM 21 11 10 8470 204 10 LIST OF EFFECTIVE PAGES WORK PACKAGES Date of issue for original and changed pages work packages is Original 0 31 May 04 TOTAL NUMBER OF PAGES FOR FRONT AND REAR MATTER IS 18 AND TOTAL NUMBER OF WORK PACKAGES IS 23 CONSISTING OF THE FOLLOWING Page WP Change WP Page Change No No No No a b 0 A B 0 i iv 0 WP 0
30. ncy repairs Although shipped separately packaged BII must be with the Advanced Combat Helmet during operation and when it is transferred between property accounts Listing these items is your authority to request requisition them for replacement based on authorization of the end item by the TOE MTOE Illustrations are furnished to help you find and identify the items Explanation of Columns in the COEI List and BII List Column 1 Illus Number Gives you the number of the item illustrated Column 2 National Stock Number NSN Identifies the stock number of the item to be used for requisitioning purposes Column 3 Description CAGEC and Part Number Identifies the Federal item name in all capital letters followed by a minimum description when needed The stowage location of COEI and BII is also included in this column The last line below the description is the 0019 00 1 10 8470 204 10 0019 00 CAGEC Commercial and Government Entity Code in parentheses and the part number Column 4 Usable On Code When applicable gives you a code if the item you need is not the same for different models of equipment Add the following only as applicable Replace Xs with appropriate codes and model numbers These codes are identified below Code Used on XXX Model XXX XXX Model XXXX XXX Model XXXXX Column 5 Unit of Issue Indicates the physical measurement or count of the item as issued per the National Stock Number shown
31. ociated and Repair Items List for appropriate NSN END OF WORK PACKAGE 0011 00 4 10 8470 204 10 001200 OPERATION UNDER USUAL CONDITIONS EYEWEAR RETENTION STRAP INSTALLATION INSTRUCTIONS This work package provides instructions for installing the eyewear retention strap on the ACH 1 Make sure you have two eyewear retention straps see WP 0022 00 Associated and Repair Items List for appropriate NSN 2 If the helmet cover is installed remove the rear cover retaining tabs and slide the rear half of the cover up to expose the two rear screws You can also remove the cover completely see WP 0010 00 3 Remove the two rear screws and place an eyewear retention strap over the barrel shaft of each of the two screws with the snap socket and stud facing away from the helmet See Eyewear Retention Strap and Screw Assembly illustration in this work package A strap is installed on each of the two rear screws 4 Insert the screws with eyewear retention straps attached into holes in helmet 5 Place p clamps and nuts on the screws and tighten See WP 0014 00 which shows screw and nut installation for replacing the hardware 6 Install the helmet cover While installing the cover thread eyewear retention strap through lower most rear buttonhole on cover see WP 0010 00 for attaching the helmet cover See Helmet with Eyewear Retention Strap Installed illustration for finished assembly 0012 00 1 10 8470
32. ont Cover Provides information about the equipment covered by the TM Warning Summary Provides a summary of all warnings that apply throughout the manual Table of Contents Lists chapters and work packages in order of appearance Chapter 1 Description and Theory of Operation Provides descriptions equipment data and theory of operation information Chapter 2 Operator Instructions Provides sizing information donning information and operating instructions in both usual and unusual conditions Chapter 3 Maintenance Procedures Provides cleaning and repair instructions and maintenance procedures Chapter 4 Supporting Information Provides reference information Components of End Item COEI Basic Issue Items BII Lists Associated and Repair Items List and Expendable and Durable Items List 10 8470 204 10 NAVIGATION This TM is in work package format All of the work packages contained within the TM are listed in the table of contents in the order they appear by chapters The work package sequence number e g WP 0001 00 is listed for each work package in the table of contents The work package sequence number is at the top of each page of the work package and is also a part of the page number for each work package e g WP 0001 00 1 The page numbers appear at the bottom of each page OPERATION AND MAINTENANCE Before you use the Operator s Manual for Advanced Combat Helmet ACH familiarize yourself with the
33. orm the mission 0017 00 1 10 8470 204 10 001700 Table 1 Preventive Maintenance Checks and Services ITEM INTERVAL ITEM TO PROCEDURE EQUIPMENT NOT NO BE READY AVAILABLE CHECKED IF OR SERVICED 1 Before Chinstrap Check for 1 Retention Cuts frays or Chinstrap webbing System other damage has cuts frays or or loose or damaged stitching in the webbing If webbing is frayed more than 77 or hasa discernable cut or loose or damaged stitching refer to higher level maintenance for repair 2 Cracked worn or damaged hardware p clamp ladder lock nut Screw and buckle Refer to higher level maintenance for repair 3 Loose screws Tighten screws or refer to higher level maintenance if loose 0017 00 2 other damage Hardware or buckle is cracked worn or damaged Screws loose 10 8470 204 10 Pads Shell Cuts tears or other damage to outer fabric or inner foam If pads are torn or cut exposing the inner padding replace 1 Gouges scrapes cracks delamination or other damage to shell If gouges scrapes or damage extends below the surface below the paint refer to higher level maintenance for repair 2 Loose or damaged edging Refer to higher level maintenance for repair 3 Loose or damaged hook disks Refer to higher level maintenance for repair 001
34. other high risk operations such as air assault and rappelling mountaineering Failure to observe this precaution could result in serious injury or death because all seven 7 pads provide maximum impact protection WARNING The rear trapezoidal pad must be placed flush with the rim edge of the helmet for airborne operations If you experience helmet rotation during airborne operations the rear trapezoidal pad can be placed so that it extends beyond the rim of the helmet Placement of the rear trapezoidal pad flush or beyond the rim edge of the helmet prevents the hard shell from hitting your neck See Pad Placement over Hardware Front and Pad Placement over Hardware Rear illustrations 0013 00 1 10 8470 204 10 0013 00 oblong oval pad hardware sa Pad Placement over Hardware Front hardware rim edge of helmet pd trapezoidal pad LE oblong oval pad Pad Placement over Hardware Rear 0013 00 2 CHAPTER 3 MAINTENANCE PROCEDURES FOR ADVANCED COMBAT HELMET 10 8470 204 10 0014 00 MAINTENANCE PROCEDURES REPLACING THE HARDWARE This work package provides instructions for replacing the ACH s hardware ladder lock p clamp screw or nut NOTE To replace hardware use a standard flathead screwdriver If this tool is unavailable a coin may be used 1 Remove the chinstrap retention system as described in WP 0009 00 2 Remove the screw with a standard flathead screwdrive
35. r and lift the ladder lock and p clamp out 3 Replace the necessary portion ladder lock or p clamp Replace screw and nut Ensure the proper orientation of the ladder locks by seating the nut in the recessed portion of the p clamp See Hardware Installation illustration in this work package Tighten the screw 4 Inspect the screws to ensure tightness If loosening persists use the sealing compound thread locking compound see WP 0020 Expendable and Durable Items List Follow directions on container 0014 00 1 10 8470 204 10 0014 00 Hardware Installation END OF WORK PACKAGE 0014 00 2 10 8470 204 10 0015 00 MAINTENANCE PROCEDURES REPLACING THE PAD SUSPENSION This work package provides information on replacing the pad suspension Replacing Pad Suspension NOTE On one side the pads are covered with a loop material On the other side the pads are covered by moisture wicking fabric ONLY THE LOOP SIDE OF THE PAD WILL ATTACH TO THE HOOK DISKS ON THE HELMET SHELL Press the pad against the hook disks The loop side of the pad is green 1 Pull the individual pads off the inner helmet hook disks 2 Reattach suspension pads as needed see WP 0005 00 for Pad Configurations and WP 0006 for Pad Suspension Adjustment END OF WORK PACKAGE 0015 00 1 2 Blank 10 8470 204 10 0016 00 MAINTENANCE PROCEDURES CLEANING INSTRUCTIONS This work package provides instructions for cleaning the ACH Helmet Shel
36. r assault and rappelling mountaineering Failure to observe this precaution could result in serious injury or death because all seven 7 pads provide maximum impact protection WARNING If you experience fit problems tightness looseness or helmet profile is too high or too low refer to Sizing and Fitting Troubleshooting guidelines NOTE When donning the helmet for the first time in a cold environment it is necessary to wear the helmet for a few minutes or otherwise warm the pads such as by placing in pockets so that the pads will conform to the shape of your head Hardware rim edge of helmet trapezoidal pad oblong oval pad As the pads warm up and conform to the shape of your head it may be necessary to retighten the chinstrap retention system 0006 00 2 10 8470 204 10 0006 00 WARNING Up to two pads either oblong oval or trapezoidal can be removed in non risk situations However the circular crown must always remain in the helmet NOTE If you experience hot spots or discomfort try rearranging the pad system to accommodate a more comfortable fit If discomfort persists try resizing your shell See Sizing and Fitting Instructions WP 0004 00 or Sizing and Fitting Troubleshooting WP 0007 00 The direction of the side oblong oval pads may be changed to maximize comfort These pads may be routed vertically from bolt to crown This configuration maximizes airflow for better temperature regulation These pads may
37. rap to prevent jamming tighten nape pad slide nape pad up and down Doffing To doff remove the helmet To doff the helmet press the sides of the center section of the buckle on the chinstrap retention system inward Once the buckle releases remove the helmet To just loosen the chinstrap push up on the ladder lock END OF WORK PACKAGE 0008 00 4 10 8470 204 10 0009 00 OPERATION UNDER USUAL CONDITIONS REMOVING AND REPLACING CHINSTRAP RETENTION SYSTEM This work package provides instructions for replacing the ACH s chinstrap retention system 1 2 Unthread the chinstrap retention system webbing from the ladder lock Lay the helmet on its crown with the front of the helmet away from you buckle is located on right side of helmet Drape the replacement chinstrap retention system over the helmet with the nape strap pad facing down on the back rear of the helmet see Chinstrap Retention Orientation illustration below Insert and thread the four legs of the chinstrap into their corresponding ladder locks See Routing of Chinstrap Retention System Webbing through Ladder Lock illustration below For illustration of entire assembled helmet with chinstrap retention and hardware please refer to WP 0002 Take care to ensure that webbing is not twisted Slide elastic band over loose ends of webbing front of helmet buckle Chinstrap Retention System Orientation 0009 00 1 10 8470 2
38. t Maintenance Manual for General Repair Procedures for Individual Equipment TM 11 5855 262 10 2 Night Vision Goggles AN PVS 7B NSN 5855 01 228 0937 EIC LPS and AN PVS 7D NSN 5855 01 422 54 EIC N A TO 12510 2PVS7 11 TM 09500A 10 1A NAVSEA SW215 AT TM 11 5855 306 10 Monocular Night Vision Device AN PVS 14 NSN 5855 01 432 0524 EIC N A TM 10271A 10 1 MISCELLANEOUS PUBS DA PAM 738 750 Functional User s Manual for the Army Maintenance END OF WORK PACKAGE 0018 00 1 2 blank 10 8470 204 10 0019 00 SUPPORTING INFORMATION COMPONENTS OF END ITEM AND BASIC ISSUE ITEMS LISTS INTRODUCTION Scope This work package lists and BII for the Advanced Combat Helmet to help you inventory items for safe and efficient operation of the equipment General The and BII information is divided into the following lists Components of End Item COEI This list is for information purposes only and is not authority to requisition replacements These items are part of the helmet As part of the end item these items must be with the end item whenever it is issued or transferred between property accounts Items of are removed and separately packaged for transportation or shipment only when necessary Illustrations are furnished to help you find and identify the items Basic Issue Items BII These essential items are required to place the Advanced Combat Helmet in operation operate it and to do emerge
39. tions for replacing the chinstrap cover retaining tabs Helmet Cover Installed 0010 00 2 10 8470 204 10 0010 00 The communications flap is used to store cables from the headset microphone that is sometimes used with the helmet The flap can also be used to secure goggle straps if no eyewear retention straps are available Lift the flap and place the goggle strap under the flap Re secure the flap by pressing the hook and loop together END OF WORK PACKAGE 0010 00 3 4 Blank 10 8470 204 10 001100 OPERATION UNDER USUAL CONDITIONS FRONT BRACKET ASSEMBLY KIT INSTALLATION This work package provides instructions for installing the front bracket assembly kit on the ACH 1 Make sure that the front bracket assembly kit has all the components You should have a front bracket assembly a screw and a threaded post see illustration below See WP 0022 00 Associated and Repair Items List for appropriate NSN 2 Install the helmet cover on your helmet See WP 0010 00 for attaching helmet cover instructions front bracket assembly D threaded post D Front Bracket Assembly Kit Contents 0011 00 1 10 8470 204 10 001100 3 Place the front bracket assembly on the helmet over the helmet cover Line up the hole in the plate the front buttonhole in the cover and the hole in the helmet shell see Front Bracket Assembly Positioned Helmet illustration in this work package Mov
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