# SDR AALA202512023183

- 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: Indicator
- Part number: WL501RC1
- Part serial: AU857049
- Condition: Failed
- Location: Zone 200
- Part time: 11,803 hours, 5,483 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A, I
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202512023183

## 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.  R & R 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. R & R CABIN RATE OF CLIMB INDICATOR (AALA202512023183), PER AMM 21-33-01-400-801. R & R CABIN ALTIMETER AND RATE OF CLIMB MODULE (AALA202512021304), PER AMM 21-33-07-400-801. ALL OPERATIONAL CHECK GOOD.

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