# SDR AALA202608316158

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 29, 2026
- Submitted: September 1, 2026
- Operation: Air carrier
- Aircraft: [N926NN](https://openairdocs.org/aircraft/N926NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 33321
- Aircraft time: 39,494 hours, 17,246 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Duct
- Condition: Leaking
- Location: Zone 300
- Stage of operation: DE
- How discovered: O
- Nature of condition: O
- Precautionary procedure: G
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202608316158

## Discrepancy

AIRCRAFT WAS GROUNDED: CABIN ALT WARNING DESCENDING THROUGH 26K. STAYED AT 10K CABIN ALT. NO MASKS DROPPED IN THE CABIN. FLIGHT DECK USED PILOTS O2 MASKS. ARFF WAS DISTPATCHED AS A PRECAUTION. AIRCRAFT LANDED WITHOUT INCIDENT.  MAINTENANCE REPLACED APU PNEUMATIC DUCT AT AFT PRESSURE BULKHEAD PER AM M 36-13-01.

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