14021: 70899( ) Strobe Power Supply Assembly
Contents
1. NUMBERS CABLES CONNECTING REMOTE POWER SUPPLY TYPE STROBE LIGHTS MUST BE CONNECTED CORRECTLY Whelen Engineering and Aero flash wiring between light assemblies and remote power supplies are identical as pictured below SHIELD Grimes and SDI Hoskins wiring between light assemblies and remote power sup plies are identical as pictured below SHIELD Both Grimes and SDI sometimes use MS Cannon Type Connectors A RED Anode B WHITE Trigger C BLACK Ground Page 22. than 12 inches 3 CABLE COLORING CODING see Figure 3 PIN 1 RED Anode PIN 2 BLACK Cathode flash tube ground PIN 3 WHITE Trigger SHIELD Ground at power supply end only CAUTION When pins 1 amp 2 or pins 2 amp 3 are reversed the system will appear to operate normally however this condition will cause premature flash tube failure Fig 2 IMPORTANT NOTE Your new strobe power supply has an additional circuit built in to prevent self ionization steady glowing of the strobe tubes In some cases when replacing older power supplies the bare shield wire in the existing harness is pinned together at each end with the black wire The following modification must be made to ensure proper operation 1 At the strobe tube end of the cable cut the shield wire and tape it off DO NOT CUT THE BLACK WIRE 2 At the power supply end of the cable cut the shield wire and connect it to a good ground DO NOT CUT THE BLACK WIRE 3 This must be done for each strobe light connection see Fig 2 PIN 1 RED ANODE PIN 2 BLACK CATHODE PIN 3 WHITE TRIGGER SHIELD RFI DRAIN TO GROUND 3 POS PIN HSG 3 CONDUCTOR SHIELDED CABLE 3 POS SOCKET HSG POWER 1 1 STROBE SUPPLY 2 2 TUBE END 3 3 END SHIELD WIRE x CUT AND TAPE SHIELD WIRE AT STROBE TUBE END ma GROUND SHIELD WIRE AT POWER SUPPLY END INTERMIXING STROBE LIGHT SYSTEM EQUIPMENT OBSERVE COLOR AND PIN
3. Aviation Fig 1 WHELEN ENGINEERING COMPANY INC Route 145 Winthrop Road Chester Connecticut 06412 Phone 860 526 9504 Fax 860 526 2009 Internet www whelen com Sales Service e mail aviation whelen com Specifications Model Number 7089900 Part Number 01 0770899 00 Current Draw 2 4 Amps 28 Volts D C Weight 1 8 Ibs Length 5 5 Height 3 0 Width 5 0 Installation Guide Model 70899 Strobe Power Supply Assembly TSO C96a Approved Paes MADE IN THE U S A The conditions and tests required for TSO approval of this article are minimum performance standards It is the responsibility of those installing this article either on or within a specific type or class of aircraft to determine that the aircraft installation conditions are within the TSO standards TSO articles must have separate approval for installation in aircraft The article may be installed only if performed under 14 CFR part 43 or the applicable airworthiness requirements OPERATION This power supply will operate up to 2 strobe light head assemblies Total power to each output is 36 joules Output 1 alternates with output 2 The typical configuration is to connect output 1 to one wingtip strobe light assembly and output 2 to the other wingtip strobe light assembly CONTINUED AIRWORTHINESS The power supply output should be checked on a regular basis for flash rate The flash rate may be checked by indir
4. ect observation of the strobe lighthead Do not look directly at the strobe light If the strobe does not appear to be functioning correctly try to determine if the problem is with the power supply or the strobe lighthead This can be accomplished by replacing the strobe tube or lighthead assembly with a good operating unit or with the use of a Whelen Strobe Check unit Periodically check the power supply connections and wiring Also check and tighten or clean the Ground wire connection at the power supply case EQUIPMENT LIMITATIONS An approved Anti Collision System consists of Power Supply 70899 connected to two Whelen Strobe Light Assemblies model A650 Series A600 Series or A625 Series TYPICAL STROBE HOOK UP PIN 1 RED ANODE PIN 2 BLACK CATHODE PIN 3 WHITE TRIGGER PIN 1 2 3 SYNC Connector for Input Power Cable Outlet 1 2005 Whelen Engineering Company Inc Form No 14021 102405 1 TYP 2TYP 3 TYP Outlet 2 STROBE OUTLETS Page 1 INSTALLATION PROCEDURES Location 1 Consider areas or locations designated by the aircraft manufacturer Do not mount the strobe power supply any closer than 3 feet from the ADF loop 2 For alternate locations consider areas such as the cabin baggage compartment the floor under the seat non structural bulkheads firewalls etc 3 If necessary fabricate support brackets or shelves and at
5. tach them to the aircraft structure to provide a mounting surface that will withstand the inertia forces stipulated in chapters 1 amp 3 of AC 43 13 2A 4 An IA or other representative of the FAA must approve documentation of structural integrity of the fabricated installation 5 Specifically call out the location of the strobe light power supply on FAA form 337 Wiring WARNING STROBE LIGHT POWER SUPPLIES ARE POLARITY SENSITIVE REVERSING THE INPUT POLARITY WILL CAUSE SEVERE DAMAGE TO THE POWER SUPPLY Steps below Ref AC 43 13 1B Chapter 11 Sections 1 2 3 amp 7 1 Choosing wire size of A input lead refer to Paragraph 444 Electric Wire Chart Figure 11 7 and 11 7A with reference to Strobe Light Model Current requirement chart on page 6 and 11 and Wire and Circuit Protection Chart Figure 11 1 2 Shielded wire is not generally necessary but has proven effective in reducing the possibility of radio interference 3 The power supply shall acquire its power from a low impedance source such as the alternator or generator end of the electrical buss as close to the battery as possible 4 For penetrating pressure hull refer to the aircraft service manual 5 Check all avionics systems for interference Interconnecting Cable 1 The Whelen interconnecting cable shall be secured in place with approved aviation techniques 2 The cable shall not parallel ADF Gyro or Flux Gate compass leads closer
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