(1) If there is damage/leakage in the APU FUEL SYSTEM
- do a repair.
(2) If the APU FUEL SYSTEM is OK:
- purge the aircraft fuel-line of the APU-pump fuel-system. (Ref. AMM TASK 28-22-00-710-001).
(a) If the fault continues:
- replace the FUEL FILTER (8028KM) (Ref. AMM TASK 49-32-41-920-001).
(b) If the fault continues:
- replace the IGNITER PLUG (Ref. AMM TASK 49-41-41-000-005) and (Ref. AMM TASK 49-41-41-400-004)
(c) If the fault continues:
- replace the IGNITER LEAD (Ref. AMM TASK 49-41-43-000-003) and (Ref. AMM TASK 49-41-43-400-003)
(d) If the fault continues:
- replace the IGNITION UNIT (8030KM) (Ref. AMM TASK 49-41-43-000-003) and (Ref. AMM TASK 49-41-43-400-003)
(e) If the fault continues:
- do a check of the FCU CONTROL UNIT drive:
- remove the FUEL CONTROL UNIT (8022KM) (Ref. AMM TASK 49-32-11-000-003).
- remove the end cap from the STARTER MOTOR (8KA).
- use a socket and a ratchet on the shaft of the STARTER MOTOR (8KA) to turn the APU counterclockwise
- verify if the LUBE PUMP shaft turns.
1 If the LUBE PUMP shaft does not turn:
_
- replace the LUBE OIL MODULE (8076KM) (Ref. AMM TASK 49-91-45-000-003) and (Ref. AMM TASK 49-91-45-400-003).
2 If the LUBE PUMP shaft turns:
_
- replace the FUEL CONTROL UNIT (8022KM) (Ref. AMM TASK 49-32-11-400-003).
a If the fault continues:
_
- replace the FLOW DIVIDER (8024KM) (Ref. AMM TASK 49-32-13-000-001) and (Ref. AMM TASK 49-32-13-400-001).
b If the fault continues:
_
- replace the APU INLET PRESSURE TRANSDUCER (8048KM) (Ref. AMM TASK 49-51-21-000-001) and (Ref. AMM TASK 49-51-21-400-001).
NOTE : The APU can have a normal start on the ground and
____ fail a start in the air if the proper ambient corrections are not made (calibration shift).
「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 : 001-049, 101-105, 151-199, 201-210, ∞∞49-00-81∞∞∞∞∞∞∞∞∞∞Page 258
Config-1 May 01/05 CES c If the fault continues:
_
- replace the APU INLET TEMPERATURE SENSOR (8010KM) (Ref. AMM TASK 49-23-14-000-001) and (Ref. AMM TASK 49-23-14-400-001).
NOTE : The APU can have a normal start on the ground and
____ fail a start in the air if the proper ambient corrections are not made (calibration shift).
d If the fault continues:
_
- replace the ECB (59KD) (Ref. AMM TASK 49-61-34-000-003) and (Ref. AMM TASK 49-61-34-400-003).
e If the fault continues:
_
- replace the APU (4005KM) (Ref. AMM TASK 49-11-11-000-004) and (Ref. AMM TASK 49-11-11-400-004).
R **ON A/C 001-049, 101-105, 107-107, 151-199, 201-210,
B. Do the test given in para. 3.
「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 : 001-049, 101-105, 107-107, 151-199, ∞∞49-00-81∞∞∞∞∞∞∞∞∞∞Page 259
201-210, Config-1 Aug 01/05 CES
TASK 49-00-81-810-822
APU AUTO SHUTDOWN - NO FLAME, Fuel Pressure is low during APU Run (131-9(A))
1. Possible Causes
_______________
- FUEL PRESSURE SHOWS LOW DURING APU RUN
- air in the fuel
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
28-22-00-810-801 APU Fuel System - Low Pressure
AMM 28-22-00-710-001 Operational Test of the APU Fuel-Pump System on
Ground to Purge the Fuel Line
AMM 49-00-00-860-008 APU Start by External Power (131-9(A))
3. Fault Confirmation
__________________
A. Read-out of ECB Trouble-Shooting Data
(1) Put the APU MASTER SW to the ON position.
(2) Get access to the APU SHUTDOWN report.
(3) Push the '>' adjacent to LRU DATA:
- the MCDU menu shows
FUEL PRESSURE SHOWS LOW DURING APU RUN
(4) Purge the APU fuel-line to make sure that there is no air in the fuel (Ref. AMM TASK 28-22-00-710-001) .
(5) Start the APU and apply Bleed Air for 20 seconds, minimum (Ref. AMM TASK 49-00-00-860-008).
4. Fault Isolation
_______________
A. If an APU auto shutdown occurs during the APU operation and the APU SHUTDOWN report gives the maintenance message:
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