TASK 49-00-81-810-853
Differential-Pressure Transducer (P24) Fault (131-9(A))
1. Possible Causes
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- DELTA PRESSURE SENSOR SHOWS OUT OF RANGE DRIFT
- DELTA PRESSURE SENSOR SHOWS OUT OF RANGE LOW
- DELTA PRESSURE SENSOR SHOWS OUT OF RANGE HIGH
- damage/contamination of electrical connector P24
- DIFFERENTIAL PRESSURE TRANSDUCER (P24)
- aircraft wiring
- ECB (59KD)
- DIFFERENTIAL PRESSURE TRANSDUCER (8043KM)
2. Job Set-up Information
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A. 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 49-51-16-000-002 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 49-61-34-000-003 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 49-61/01
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 LAST LEG/PREVIOUS LEG report.
(3) Push the '>'-key adjacent to the related CFDS failure message.
(4) If the MCDU menu shows
DELTA PRESSURE SENSOR SHOWS OUT OF RANGE DRIFT
- do the Fault Confirmation that follows:
(a) Get access to the APU TEST menu.
(b) Push the TEST line key.
(5) If the MCDU menu shows
DELTA PRESSURE SENSOR SHOWS OUT OF RANGE LOW
or
DELTA PRESSURE SENSOR SHOWS OUT OF RANGE HIGH
- do the Fault Confirmation that follows:
(a) Start the APU and apply Bleed Air for 20 seconds, minimum (Ref. AMM TASK 49-00-00-860-008)
(b) 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 TEST menu or the APU GND SCANNING menu gives the maintenance message:
DIFFERENTIAL PRESS XDCR P24 associated with Fault Code Number (FCN) 16, 17, 18 or 19
- do a check for damage/contamination of electrical connector P24 of the DIFFERENTIAL PRESSURE TRANSDUCER (P24)
(1) If the electriacl connector P24 is damaged/contaminated:
- do a repair/cleaning.
(2) If the electrical connector is OK:
- replace the DIFFERENTIAL PRESSURE TRANSDUCER (P24) (Ref. AMM TASK 49-51-16-000-002) and (Ref. AMM TASK 49-51-16-400-002).
(a) If the fault continues:
- do a check and repair of the aircraft wiring between ECB (59KD) AB/A1,A4,B2,B3 and the DIFFERENTIAL PRESSURE TRANSDUCER (P24) P24/1,2,3,4 (Ref. ASM 49-61/01).
(3) 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 the APU TEST menu or the APU GND SCANNING menu gives the maintenance message:
DIFFERENTIAL PRESS XDCR (8043KM)
associated with Fault Code Number (FCN) 16, 17, 18 or 19
「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 A271
201-210, Config-1 Aug 01/05 CES
- do a check for damage/contamination of electrical connector P24 of the DIFFERENTIAL PRESSURE TRANSDUCER (8043KM).
(1) If the electriacl connector P24 is damaged/contaminated:
- do a repair/cleaning.
(2) If the electrical connector is OK:
- replace the DIFFERENTIAL PRESSURE TRANSDUCER (8043KM) (Ref. AMM TASK 49-51-16-000-002) and (Ref. AMM TASK 49-51-16-400-002).
(a) If the fault continues:
- do a check and repair of the aircraft wiring between ECB (59KD) AB/A1,A4,B2,B3 and the DIFFERENTIAL PRESSURE TRANSDUCER (8043KM) P24/1,2,3,4 (Ref. ASM 49-61/01).
(3) 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 as in Para. 3.A.(3) or 3.A.(4).
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