(3) Push the APU Start SW p/bsw and check that the ON legend comes on.
(4) Release the APU Master SW p/bsw.
(5) Push the BAT1 and BAT2 p/bsw to the ON position.
4. Fault Isolation_______________
A. Do the test given in para. 3.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 001-049, 101-105, 107-107, 151-199, ∞∞49-00-81∞∞∞∞∞∞∞∞∞∞Page B271
201-210, Config-1 Aug 01/05 CES
TASK 49-00-81-810-899
10V Pressure Reference not Correct (131-9(A))
1. Possible Causes
_______________
- PRESS XDCR WIRING SHOWS OPEN CIRCUIT
- APU INLET PRESSURE TRANSDUCER (P22)
- TOTAL PRESSURE TRANSDUCER (P23)
- DELTA PRESSURE TRANSDUCER (P24)
- APU wiring harness
- aircraft wiring
- APU INLET PRESSURE TRANSDUCER (8048KM)
- TOTAL PRESSURE TRANSDUCER (8044KM)
- DELTA PRESSURE TRANSDUCER (8043KM)
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific multimeter
B. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 49-51-16-000-002 Removal of the Transducer - Differential Pressure (8043KM) (131-9(A)) AMM 49-51-16-400-002 Installation of the Transducer - Differential Pressure (8043KM) (131-9(A)) AMM 49-51-17-000-002 Removal of the Transducer - Total Pressure (8044KM) (131-9(A)) AMM 49-51-17-400-002 Installation of the Transducer - Total Pressure
(8044KM) (131-9(A))
AMM 49-51-21-000-001 Removal of the Transducer - APU Inlet Pressure
(8048KM) (131-9(A))
AMM 49-51-21-400-001 Installation of the Transducer - APU Inlet Pressure (8048KM) (131-9(A)) ASM 49-61/01
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 LAST LEG/PREVIOUS LEG report.
(3) Push the '>' adjacent to the related CFDS failure message:
- the MCDU menu shows
PRESS XDCR WIRING SHOWS OPEN CIRCUIT
(4) Get access to the APU GND SCANNING menu.
4. Fault Isolation
_______________ R **ON A/C 001-049, 101-105, 107-107, 151-154, 201-207,
A. If the APU GND SCANNING menu gives the maintenance message:
CHECK PRESSURE XDCR WIRING
associated with Fault Code Number (FCN) 30
- disconnect the electrical connector P2 at the APU firewall. Use a multimeter to do a resistance check across pin 20 and pin 21 of the electrical connector P2.
(1) If the resistance is < 75 Ohms:
- disconnect the electrical connector P22 of the APU INLET PRESSURE TRANSDUCER (P22). Do a resistance check across pin 20 and pin 21 of the electrical connector P2 again.
(a) If the resistance is < 75 ohms:
- replace the APU INLET PRESSURE TRANSDUCER (P22) (Ref. AMM TASK 49-51-21-000-001) and (Ref. AMM TASK 49-51-21-400-001).
(b) If the resistance is > 75 Ohms:
- disconnect the electrical connector P23 of the TOTAL PRESSURE TRANSDUCER (P23). Do a resistance check across pin 20 and pin 21 of the electrical connector P2 again.
1 If the resistance is < 75 Ohms:
_
- replace the TOTAL PRESSURE TRANSDUCER (P23) (Ref. AMM TASK 49-51-17-000-002) and (Ref. AMM TASK 49-51-17-400-002).
2 If the resistance is > 75 Ohms:
_
- disconnect the electrical connector P24 of the DELTA PRESSURE TRANSDUCER (P24).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 001-049, 101-105, 107-107, 151-199, ∞∞49-00-81∞∞∞∞∞∞∞∞∞∞Page B273
201-210, Config-1 Aug 01/05 CES Do a resistance check across pin 20 and pin 21 of the electrical connector P2 again.
a_ If the resistance is < 75 Ohms:
- replace the DELTA PRESSURE TRANSDUCER (P24) (Ref. AMM
TASK 49-51-16-000-002) and (Ref. AMM TASK 49-51-16-400-
002).
b If the resistance is > 75 Ohms:
_
- replace APU wiring harness.
(2) If the resistance is > 75 Ohms:
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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(138)
