# SDR CALA2011122300824

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 23, 2011
- Submitted: December 23, 2011
- Operation: Air carrier
- Aircraft: [N24212](https://openairdocs.org/aircraft/N24212), registered now
- Make and model: Boeing 737824
- Aircraft serial: 28772
- Aircraft time: 43,156 hours, 15,202 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Clamp
- Part number: BACC10BN500L5ME
- Condition: Loose
- Location: Sta 727
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2011122300824

## Discrepancy

FL 380 PRESSURIZATION WARN HORN SOUNDED.  RAN CHECKLIST UNABLE TO HOLD PRESS IN MANUAL.  EMERGENCY DESCENT - PRESSURIZATION CONTROLLER IN MANUAL WORKED AT 5000 LWR PSI.  FOUND APU DUCT REAR BELLOW IN KEEL BEAM CLAMP OFF, RESCUED.  PERFORMED CABIN PRESSURE LEAK CHECK, TEST PASS REF AMM 05-51-91-790-80 1.

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