APU AUTO SHUTDOWN - LOSS OF SPEED, Speed Sensor Fault (131-9(A))
1. Possible Causes
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- SPEED SENSOR SHOWS AMPLITUDE FAILURE
- damage/contamination of the electrical connector P26
- SPEED SENSOR 1 and/or 2
- aircraft wiring
- (59KD)
- SPEED SENSOR (8060KM) 1 and/or 2
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 49-61-34-000-003 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)) AMM 49-71-13-000-003 Removal of the Speed Sensors (8060KM) (131-9(A)) AMM 49-71-13-400-003 Installation of the Speed Sensors (8060KM) (131-9(A)) ASM 49-61/01
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
SPEED SENSOR SHOWS AMPLITUDE FAILURE
(4) Start the APU and apply Bleed Air for 20 seconds, minimum (Ref. AMM TASK 49-00-00-860-008).
「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 A245
201-210, Config-1 Aug 01/05 CES
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:
LOSS OF SPEED
SPEED SENSOR P26
associated with the Fault Code Number (FCN) 1
- do a check and repair for damage/contamination of the electrical connector P26 of the SPEED SENSOR 1/2 (P26).
(1) If the electrical connector P26 is damaged/contaminated:
- do a repair/cleaning
(2) If the electrical connector is OK:
- use a multimeter to do a resistance check across pin 1 and pin 2; required value < 25 Ohms and pin 3 and pin 4; required value < 25 Ohms and the pin 1/pin 3 and pin 5; required value < 100 kOhms
(a) If the resistance values are out of the specified limits:
- replace the SPEED SENSOR 1 and/or 2 (Ref. AMM TASK 49-71-13-000-003) and (Ref. AMM TASK 49-71-13-400-003).
(b) If the resistance values are in the specified limits:
- do a check and repair of the aircraft wiring from the ECB (59KD) AB/E6,E7 to the electrical connector P26/1,2 (SPEED SENSOR 1) and the ECB (59KD) AB/D3,D4 to the electrical connector P26/3,4 (SPEED SENSOR 2) (Ref. ASM 49-61/01).
1 If the fault continues:
_
- replace the (59KD) (Ref. AMM TASK 49-61-34-000-003) and (Ref. AMM TASK 49-61-34-400-003).
「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 A246
201-210, Config-1 Aug 01/05 CES
**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:
LOSS OF SPEED
SPEED SENSOR (8060KM)
associated with the Fault Code Number (FCN) 1
- do a check and repair for damage/contamination of the electrical connector P26 of the SPEED SENSOR 1/2 (8060KM).
(1) If the electrical connector P26 is damaged/contaminated:
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本文链接地址：A320 Trouble Shooting Manual 排故手册 机载辅助动力 2(89)
