TASK 49-00-81-810-807
APU AUTO SHUTDOWN - UNDERSPEED, Fuel-Control Unit Fault (131-9(A))
1. Possible Causes
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- FUEL TORQUE MOTOR SHOWS OPEN CIRCUIT
- FUEL TORQUE MOTOR SHOWS SHORT CIRCUIT
- FUEL SOLENOID SHOWS CIRCUIT FAILURE
- damage/contamination of electrical connector P19
- FUEL CONTROL UNIT (P19)
- aircraft wiring
- ECB (59KD)
- FUEL CONTROL UNIT (8022KM)
2. Job Set-up Information
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A. Fixtures, Tools, Test and Support Equipment
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REFERENCE QTY DESIGNATION
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No specific multimeter
B. Referenced Information
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REFERENCE DESIGNATION
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AMM 49-00-00-860-008 APU Start by External Power (131-9(A)) AMM 49-32-11-000-003 Removal of the Fuel Control Unit (FCU) (8022KM) (131-9(A)) AMM 49-32-11-400-003 Installation of the Fuel Control Unit (FCU) (8022KM) (131-9(A)) AMM 49-61-34-000-003 Removal of the Electronic Control Box (ECB) (131-9(A)) AMM 49-61-34-400-003 Installation of the Electronic Control Box (ECB) (131-9(A)) ASM 49-61/02
3. Fault Confirmation
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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 TORQUE MOTOR SHOWS OPEN CIRCUIT
or
FUEL TORQUE MOTOR SHOWS SHORT CIRCUIT
or
FUEL SOLENOID SHOWS CIRCUIT FAILURE
(4) Start the APU and apply Bleed Air for 20 seconds, minimum (Ref. AMM TASK 49-00-00-860-008).
4. Fault Isolation
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R **ON A/C 001-049, 101-105, 107-107, 151-154, 201-207,
A. If an APU auto shutdown occurs during the APU operation and the APU SHUTDOWN report gives the maintenance message:
UNDERSPEED
FUEL CONTROL UNIT P19
associated with Fault Code Numbers (FCN) 105, 106, 107, 108 or 125
- do a check for damage/contamination of electrical connector P19 of the FUEL CONTROL UNIT (P19)
(1) If the electrical connector P19 is damaged/contaminated:
- do a repair/cleaning.
(2) If the electrical connector is OK:
- use a multimeter to do a resistance check across pin 6 and pin 7 pin 8 and pin 9 of the FUEL CONTROL UNIT (P19).
(a) If the resistance value is not between 20 Ohms and 100 Ohms (pin 6 - 7) and/or not between 10 Ohms and 80 Ohms (pin 8 - 9).
- replace the FUEL CONTROL UNIT (P19) (Ref. AMM TASK 49-32-11-000-003) and (Ref. AMM TASK 49-32-11-400-003).
(b) If the resistance values are in the specified limits:
- do a check and repair of the aircraft wiring from the ECB (59KD) AB/H11,G7,F6 to the FUEL CONTROL UNIT (P19) P19/6,7,8 and the FUEL CONTROL UNIT (P19) P19/9 to GND (Ref. ASM 49-61/02).
「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 219
201-210, Config-1 Aug 01/05 CES 1 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).
**ON A/C 001-049, 101-105, 151-199, 201-210,
Post SB 49-1062 For A/C 001-049,101-105,151-154,201-207,
A. If an APU auto shutdown occurs during the APU operation and the APU SHUTDOWN report gives the maintenance message:
UNDERSPEED
FUEL CONTROL UNIT (8022KM)
associated with Fault Code Numbers (FCN) 105, 106, 107, 108 or 125
- do a check for damage/contamination of electrical connector P19 of the FUEL CONTROL UNIT (8022KM)
(1) If the electrical connector P19 is damaged/contaminated:
- do a repair/cleaning.
(2) If the electrical connector is OK:
- use a multimeter to do a resistance check across pin 6 and pin 7 pin 8 and pin 9 of the FUEL CONTROL UNIT (8022KM)
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