W DOC AIRBUS | TSM A320F

Differential-Pressure Transducer (P24) Fault (131-9(A))

TASK 49-00-81-810-853-A
Differential-Pressure Transducer (P24) Fault (131-9(A))

1. Possible Causes
  • 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
  • ELECTRONIC CONTROL BOX [59KD]
  • DIFFERENTIAL PRESSURE TRANSDUCER (8043KM)
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 49-00-00-860-008
APU Start by External Power
AMM 49-51-16-000-002
Removal of the Transducer - Differential Pressure (131-9(A))
AMM 49-51-16-400-002
Installation of the Transducer - Differential Pressure (131-9(A))
ASM 496104
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))
3. Fault Confirmation
Subtask 49-00-81-710-054-A ** ON A/C NOT FOR ALL
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 AMM 49-00-00-860-008
     (b) Get access to the APU GND SCANNING menu.
4. Fault Isolation
Subtask 49-00-81-810-053-A ** ON A/C NOT FOR ALL
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:
     (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 ASM 496104.
   (3) If the fault continues:
Subtask 49-00-81-810-053-B ** ON A/C NOT FOR ALL
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

  • 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:
     (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 ASM 496104.
   (3) If the fault continues:
Subtask 49-00-81-710-055-A ** ON A/C NOT FOR ALL
B. Do the test as in Para. 3.A.(3) or 3.A.(4).
[Rev.8 from Aug 2018] 2026.04.04 04:40:38 UTC
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