PIPER AZTEC SERVICE MANUAL BA
Contents
1. PIPER AZTEC SERVICE MANUAL BA 48 HARNESS ASSEMBLY 8A 49 INSPECTION OF HARNESS a Check lead assemblies for nicks Cuts mutilated braiding badly worn section or any other evidence of phys icaldamage Inspect spark plug sleeves for chafing or tears and damaged or stripped threads on coupling outs Check compression spring to see if it is broken or distorted Inspect grom met for tears Check all mounting brackets and clamps to see that they are secure and not cracked Figure 8A 17 Removal of Spring b Using an ohmmeter buzzer or From Lead Assembly other suitable low voltagedevice check each lead for continuity If continuity does not exist wire is broken and must be replaced c For electrical test of harness assembly use a high voltage direct current tester such as the TAKK Model 86 or 86A or an equivalent direct current high voltage tester capable of delivering a test potential of 10 000 volts Connect ground lead of high voltage tester to outer shielding braid of a single lead Con nect plug terminal Turn tester ON and apply 10 000 volts The insulation resistance should be 100 megohms minimum Proceed to check other leads of harness in same manner d Minor repair of the harness assembly such as replacement of contact spriogs spring retainer assemblies insulating sleeves or of onelead assembly can be accomplished with the harness assembly mounted onthe engine However should repair require replacement of more t2. han one lead assembly or of a cable outlet plate the harness should be removed from the engine and sent to an over haul shop BA 50 REMOVAL OF HARNESS a Disconnect the clamps that secure the wires to the engine and accessories b Loosenthe coupling nuts at the spark plugs and remove the insulators from the spark plug barrel well Use caution when withdrawing the insulator not m damage the insulator spring c Place a guard over the harness insulawrs d Remove the harness assembly terminal plate from the magnet Remove the harness from the airplane POWER PLANT Reissued 2 18 a 3F9
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