# SDR AALA201912319001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 30, 2019
- Submitted: December 31, 2019
- Operation: Air carrier
- Aircraft: [N934AN](https://openairdocs.org/aircraft/N934AN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29531
- Aircraft time: 58,598 hours, 24,307 cycles
- Engine: Cfmint CFM567B242
- System (JASC): [7532 · Compressor Bleed Valve](https://openairdocs.org/jasc/7532)
- Part: Regulator
- Part number: 106200841
- Part serial: 11610
- Condition: Failed
- Location: Bleed Air
- Stage of operation: DE
- 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/AALA201912319001

## Discrepancy

AIRCRAFT WAS GROUNDED: PILOT REPORTS WHILE DESCENDING THROUGH 36K. CABIN ALTITUDE WARNING. CABIN ALT REMAINED BELOW MASK  DEPLOYMENT THRESHOLD. QRC/QRH PROCEDURES. MAINTENANCE TROUBLESHOT IAW AMM 36-11-00, INDICATED BLEED AIR REG. REPLACED BLEED AIR REGULATOR IAW AMM 36-11-03. OPS CHECKS NORMAL.

---
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.