TASK 49-00-81-810-806
APU AUTO SHUTDOWN - UNDERSPEED, Fuel Flow disagrees with Command (131-9(A))
1. Possible Causes
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- FUEL FLOW DISAGREES WITH COMMAND
- 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 FLOW DISAGREES WITH COMMAND
(4) Start the APU and apply Bleed Air for 20 seconds, minimum (Ref. AMM TASK 49-00-00-860-008).
4. Fault Isolation
_______________ 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:
UNDERPEED
FUEL CONTROL UNIT P19/APU FUEL SUPPLY
associated with Fault Code Number (FCN) 79
- 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 of the FUEL CONTROL UNIT (P19).
(a) If the resistance value is > 100 Ohms:
- 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 value is < 100 Ohms:
- do a check and repair of the aircraft wiring from the ECB (59KD) AB/H11,G7 to the FUEL CONTROL UNIT (P19) P19/6,7 (Ref. ASM 49-61/02).
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:
UNDERPEED
FUEL CTRL UNIT(8022KM) / APU FUEL SUPPLY
associated with Fault Code Number (FCN) 79
「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 216
201-210, Config-1 Aug 01/05 CES
- 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 of the FUEL CONTROL UNIT (8022KM)
(a) If the resistance value is > 100 Ohms:
- replace the FUEL CONTROL UNIT (8022KM) (Ref. AMM TASK 49-32-11-000-003) and (Ref. AMM TASK 49-32-11-400-003).
(b) If the resistance value is < 100 Ohms:
- do a check and repair of the aircraft wiring from the ECB (59KD) AB/H11,G7 to the FUEL CONTROL UNIT (8022KM) P19/6,7 (Ref. ASM 49-61/02).
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).
R **ON A/C 001-049, 101-105, 107-107, 151-199, 201-210,
B. Do the test given in para. 3.
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本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 機載輔助動力 2(40)
