# SDR AALA202603245682

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 20, 2026
- Submitted: March 24, 2026
- Operation: Air carrier
- Aircraft: [N927NN](https://openairdocs.org/aircraft/N927NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31171
- Aircraft time: 37,276 hours, 16,242 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Regulator
- Part number: 1074926
- Part serial: 13464
- Condition: Failed
- Location: Zone 100
- Part time: 2,842 hours, 1,356 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: S, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202603245682

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: DURING CLIMB LEFT BLEED TRIP OFF ILLUMINATED.  AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT DFW. REMOVED AND REPLACED BLEED AIR REGULATOR (AALA202603246981). ALSO, REMOVED AND REPLACED HIGH STAGE REGULATOR ASSEMBLY (AALA202603240724). REMOVED AND REPLACED HARNESS MW0311 ON LEFT HAND ENGINE (AALA202603242436), PER 73-21-06.

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