# SDR AALA202407300088

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 27, 2024
- Submitted: July 30, 2024
- Operation: Air carrier
- Aircraft: [N811NN](https://openairdocs.org/aircraft/N811NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31079
- Aircraft time: 43,753 hours, 18,356 cycles
- Engine: Cfmint CFM567B243
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Regulator Valve
- Part number: 1074926
- Part serial: 6453
- Condition: Low Pressure
- Location: Nr 1 Engine
- Part time: 9,310 hours, 4,187 cycles
- Component: Engine, Cfmint
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202407300088

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: IMMEDIATELY AFTER TAKEOFF, NOTICED LEFT PNEUMATIC DUCT PRESSUREWAS LOW INDICATING APPROXIMATELY 5PSI. NO ASSOCIATED PNEUMATIC ANNUNCIATIONS OCCURRED. AIRCRAFT CABIN PRESSURIZED NORMALLY; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT DFW.  REMOVE AND REPLACED NUMBER 1 ENGINE BLEED AIR REGULATOR (AALA202407300088), PER AMM36-11-03. ALSO REMOVED AND REPLACED HIGH PRESSURE VALVE (AALA202407306695), PER AMM 36-11-06. OPERTIONAL AND LEAK CHECKS GOOD.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.