- the battery charge limiters 1PB1 and 1PB2 are serviceable (Ref. AMM TASK 24-38-00-710-001) or (Ref. AMM TASK 24-38-00-710-001),
- the BAT 1 and 2 pushbutton switches are pushed (the FAULT and OFF legends areoff). If the BAT 1 and 2 pushbutton switches are selected OFF, the start contactors are disconnected from the power supply,
- the Ram Air Turbine is in the retracted position.
4. Fault Isolation
_______________
A. If an APU auto shutdown occurs during the APU start sequence and the APU SHUTDOWNS report gives the maintenance message:
NO ACCELERATION - CONTACTOR 5KA OR ECB 59KD:
- do a check for short to ground of the aircraft wiring from the ECB (59KD) AC/1 to the START CONTACTOR (5KA) B/3 (Ref. ASM 49-42/01).
(1) If there is a short to ground:
- repair the aircraft wiring from the ECB (59KD) AC/1 to the MAIN START CONTACTOR (5KA) B/3 (Ref. ASM 49-42/01).
(a) If there is no short to ground:
- replace the CONTACTOR-MAIN START (5KA) (Ref. AMM TASK 49-42-55-000-001) and (Ref. AMM TASK 49-42-55-400-001).
(b) If the fault continues:
- replace the ECB (59KD) (Ref. AMM TASK 49-61-34-000-002) and (Ref. AMM TASK 49-61-34-400-002).
B. Do the test given in para. 3.
TASK 49-00-00-810-928
APU AUTO SHUT DOWN - NO ACCELERATION, Back-up Start Contactor Fault (APS 3200)
1. Possible Causes
_______________
- CONTACTOR-BACK-UP START (10KA)
- wiring
- ECB (59KD)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 49-00-00-710-008 Operational Test of the APU (APS 3200)
AMM 49-42-55-000-001 Removal of the Start Contactors (5KA,10KA)
AMM 49-42-55-400-001 Installation of the Start Contactors (5KA,10KA)
AMM 49-61-34-000-002 Removal of the Electronic Control Box (ECB) (59KD)
(APS 3200) AMM 49-61-34-400-002 Installation of the Electronic Control Box (ECB) (59KD) (APS 3200) ASM 49-42/01
3. Fault Confirmation
__________________
A. Do the operational test of the APU (Ref. AMM TASK 49-00-00-710-008).
4. Fault Isolation
_______________
A. If the APU Last Leg Report gives the maintenance message:
CONTACTOR 10KA:
Fault Code Number: 051
Additionally:
Fault Code Number: 018 or 086
NOTE : The APU SHUTDOWNS report gives the maintenance message:
____
NO ACCELERATION - CONTACTOR 10KA
APU Auto Shut Down Fault Code Number: 051
- do a check and repair the wiring from the BACK-UP START CONTACTOR (10KA) B/5 to the ground (Ref. ASM 49-42/01).
(1) If the fault continues:
- do a check and repair the wiring from the ECB (59KD) AC/6 to the BACK-UP START CONTACTOR (10KA) B/3 (Ref. ASM 49-42/01).
(a) If the fault continues:
- replace the CONTACTOR-BACK-UP START (10KA) (Ref. AMM TASK 49-42-55-000-001) and (Ref. AMM TASK 49-42-55-400-001).
1 If the fault continues:
_
- replace the ECB (59KD) (Ref. AMM TASK 49-61-34-000-002) and (Ref. AMM TASK 49-61-34-400-002).
B. Do the test given in para. 3.
TASK 49-00-00-810-931
Low PMG Voltage (APS 3200)
1. Possible Causes
_______________
- wiring
- COOLING FAN/PMG ASSY (8053KM)
- ECB (59KD)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 49-00-00-710-008 Operational Test of the APU (APS 3200) AMM 49-52-53-000-001 Removal of the PMG and Cooling Fan Assembly (8055KM) (APS 3200) AMM 49-52-53-400-001 Installation of the PMG and Cooling Fan Assembly (8055KM) (APS 3200) AMM 49-61-34-000-002 Removal of the Electronic Control Box (ECB) (59KD) (APS 3200) AMM 49-61-34-400-002 Installation of the Electronic Control Box (ECB) (59KD) (APS 3200) ASM 49-61/02
3. Fault Confirmation
__________________
A. Do the operational test of the APU (Ref. AMM TASK 49-00-00-710-008).
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