# SDR AALA202512026742

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 24, 2025
- Submitted: December 3, 2025
- Operation: Air carrier
- Aircraft: [N862NN](https://openairdocs.org/aircraft/N862NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 30905
- Aircraft time: 44,122 hours, 18,897 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Switch
- Part number: 214C502
- Part serial: L040578A
- Condition: Failed
- Location: Zone 200
- Part time: 44,122 hours, 18,898 cycles
- Stage of operation: CR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202512026742

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: LEVEL AT FL360 CABIN ALTITUDE LIGHT ILLUMINATED WITH A CABIN ALTITUDE HORN, ALSO AUTOPILOT DISCONNECTED. LIGHT STAYED ILLUMINATED UNTIL 10,000FT. MASKS DID NOT DEPLOY. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT LIT.  REMOVED AND REPLACED CABIN ALTITUDE WARNING SWITCHES S128 (AALA202511258692) AND S1153 (AALA202512026742), PER AMM 21-33-00-000-801. REMOVE AND REPLACED CABIN ALTITUDE AND DIFFERENTIAL PRESSURE INDICATOR (AALA202512027046), PER AMM 21-33-02-400-801. REMOVE AND REPLACED CABIN RATE OF CLIMB INDICATOR (AALA202512023183), PER AMM 21-33-01-400-801. REMOVE AND REPLACED CABIN ALTIMETER AND RATE OF CLIMB MODULE (AALA202512021304), PER AMM 21-33-07-400-801. ALL OPS CHECKED GOOD.

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