3. Fault Confirmation
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A. Do the operational test of the APU (Ref. AMM TASK 49-00-00-710-008).
4. Fault Isolation
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A. If the APU Last Leg Report gives the maintenance message:
ACFT BAT NOT SELECTED / CONTACTOR (5KA)
Fault Code Number: 085
select the A/C batteries ON:
- check and repair the aircraft wiring from the ECB (59KD) AC/1 to the START CONTACTOR (5KA) B/3 (Ref. ASM 49-42/01).
(1) If the fault continues:
- do a check for a ground signal (with APU MASTER SW pushed) at the MAIN START CONTACTOR (5KA) B/5 (Ref. ASM 49-42/01).
(a) If there is a ground signal:
- replace the CONTACTOR-MAIN START (5KA).
1 If the fault continues:
