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Cabin pressure sensor — removal and installation

ATA-style maintenance task card for the removal and installation of the cabin pressure sensor on the Model 7X (illustrative sample).

Audience
Licensed maintenance techs
Format
Task card (ATA/iSpec style)
ATA chapter
21 — Air Conditioning
⚠
WarningMake sure the cabin is fully depressurised and the aircraft is de-energised before you begin. Trapped cabin pressure can cause injury during component removal.

1. Tools and materials

ItemPart / spec
Torque wrench0–5 N·m, calibrated
Replacement sensorP/N 7X-21-4402-01
O-ring sealP/N 7X-21-4402-07 (replace on install)

2. References

  • AMM 21-31-00 — Cabin Pressure Control — Description and Operation
  • SWPM 20-00-00 — Standard Wiring Practices

3. Removal

  1. Open and tag the C21 circuit breaker on the overhead panel.
  2. Disconnect electrical connector DP-441 from the sensor. Fit protective caps to the connector and receptacle.
  3. Loosen the two retaining bolts and remove the sensor from its mounting bracket.
    • Discard the O-ring seal.
!
CautionDo not let the connector hang by its wiring. Support the harness to prevent damage to the pins.

4. Installation

  1. Fit a new O-ring seal (P/N 7X-21-4402-07) to the replacement sensor.
  2. Position the sensor on the bracket and hand-start both retaining bolts.
  3. Torque the retaining bolts to 3.4 N·m in an alternating sequence.
  4. Remove the protective caps and reconnect connector DP-441 until it clicks home.
  5. Remove the tag and close the C21 circuit breaker.

5. Close-up test

Perform a cabin pressure control operational test per AMM 21-31-00. Confirm the sensor reading tracks the reference within tolerance before returning the aircraft to service.

Sample only · Aircraft model, part numbers, and references are fictional and created for portfolio purposes. No proprietary or export-controlled maintenance data is reproduced.