# SDR AALA201908039011

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 2, 2019
- Submitted: August 5, 2019
- Operation: Air carrier
- Aircraft: [N905AN](https://openairdocs.org/aircraft/N905AN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29507
- Aircraft time: 59,384 hours, 24,363 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Warning Horn
- Condition: False Activation
- Location: Cabin Pressure
- Stage of operation: DE
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201908039011

## Discrepancy

AIRCRAFT WAS GROUNDED: PILOT REPORTS AT 13000 FEET GOT A PRESSURIZATION WARNING HORN FOR APPROX 7 SECONDS. CABIN ALT 2500, DIFF PRESS 4.2 INCHES 300 FPM DOWN CABIN RATE. NO WARNING LIGHTS NOTED. MAINTENANCE PERFORMED FIM PROCEDURE 31-51-00-810-803 FOR INTERMITTANT HORN IN AIR. SWITCHES S1049 AND S1050 TEST NORMAL FROM PSEU. AURAL WARNING MODULE BITE CHECKS NORMAL IAW AMM 31-51-00. ALL TESTS NORMAL.

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