AIRBORNE AUXILIARY POWER - GENERAL ((GTCP 36-300)) - FAULT ISOLATION PROCEDURES
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R **ON A/C 001-003, 051-099, 401-499,
TASK 49-00-00-810-801
APU AUTO SHUT DOWN - Slow Start Shutdown, Main Start Contactor Fault (GTCP
36-300)
1. Possible Causes
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- CONTACTOR-MAIN START (5KA)
- the BAT 1 and 2 pushbutton switches are selected OFF
- wiring
- ECB (59KD)
2. Job Set-up Information
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A. Referenced Information
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REFERENCE DESIGNATION
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AMM 49-00-00-710-004 Operational Test of the APU (4005KM) (GTCP 36-300)
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 49-61-34-000-001 Removal of the Electronic Control Box (ECB) (59KD)
(GTCP 36-300) AMM 49-61-34-400-001 Installation of the Electronic Control Box (ECB) (59KD) (GTCP 36-300) ASM 49-42/01
3. Fault Confirmation
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**ON A/C 001-003, 051-062,
A. Check/Test
NOTE : Make sure that the Battery Charge Limiters 1PB1 and 1PB2 are
____ available. If not, do the related trouble shooting.
(1) Before you start the operational test, make sure that:
- on the overhead panel 35VU, the BAT 1 and BAT 2 pushbutton switches are in the on position (the OFF legends are off). If the BAT 1 and2 pushbutton switches are selected OFF, the APU start contactor 5KA is disconnected from the power supply,
- the Ram Air Turbine is in the retracted position.
(2) Do the operational test of the APU (Ref. AMM TASK 49-00-00-710-004).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-003, 051-099, 401-499, ∞∞49-00-00∞∞∞∞∞∞∞∞∞∞Page 201
Config-1 Aug 01/05 CES
R **ON A/C 063-099, 401-499,
A. Do the operational test of the APU (Ref. AMM TASK 49-00-00-710-004).
R **ON A/C 001-003, 051-099, 401-499,
4. Fault Isolation
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**ON A/C 001-003, 051-062,
A. If an APU auto shutdown occurs during the APU start sequence and the APU SHUTDOWNS report gives maintenance message:
START TIME EXCEEDED - CONTACTOR 5KA:
- replace the CONTACTOR-MAIN START (5KA) (Ref. AMM TASK 49-42-55-000-001) and (Ref. AMM TASK 49-42-55-400-001).
(1) If the fault continues:
- do a check for a ground signal at the START CONTACTOR (5KA) B/5.
(a) If there is no ground signal:
- do a check and repair the wiring from the START CONTACTOR (5KA) B/5 to the ground (Ref. ASM 49-42/01).
(b) If there is a ground signal:
- do a check and repair of the wiring from the ECB (59KD) AC/1 to the MAIN START CONTACTOR (5KA) B/3 (Ref. ASM 49-42/01).
- do a check and repair of the wiring from the BACK-UP START CONTACTOR (10KA) A/F to the MAIN START CONTACTOR (5KA) A/D (Ref. ASM 49-42/01).
- do a check and repair of the wiring from the ECB (59KD) AB/J10 to the STARTER MOTOR (8KA) positive terminal (Ref. ASM 49-42/01).
1 If the fault continues:
_
- replace the ECB (59KD) (Ref. AMM TASK 49-61-34-000-001) and (Ref. AMM TASK 49-61-34-400-001).
R **ON A/C 063-099, 401-499,
A. Maintenance Action
(1) If an APU auto shutdown occurs during the APU start sequence and the APU SHUTDOWNS report gives maintenance message:
NO ACCELERATION - ACFT BAT NOT SELECTED/CONTACTOR 5KA:
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-003, 051-099, 401-499, ∞∞49-00-00∞∞∞∞∞∞∞∞∞∞Page 202
Config-1 Aug 01/05 CES with the LRU TROUBLE SHOOT DATA menu information MAIN START CONTACTOR SHOWS OPEN CIRCUIT Fault Code Number: 123
- do a check and repair of the wiring from the ECB (59KD) AB/J10 to the STARTER MOTOR (8KA) positive terminal (Ref. ASM 49-42/01).
- do a check and repair the wiring from the START CONTACTOR (5KA) B/5 to the ground (Ref. ASM 49-42/01).
(a) If the fault continues:
- replace the CONTACTOR-MAIN START (5KA) (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 49-61-34-000-001) and (Ref. AMM TASK 49-61-34-400-001). 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 機載輔助動力 1
