# SDR AALA202607072549

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 3, 2026
- Submitted: July 7, 2026
- Operation: Air carrier
- Aircraft: [N996NN](https://openairdocs.org/aircraft/N996NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31248
- Aircraft time: 28,559 hours, 12,618 cycles
- System (JASC): [3413 · Rate of Climb Indicator](https://openairdocs.org/jasc/3413)
- Part: Indicator
- Part number: 171360000
- Condition: Faulted
- Location: Zone 200
- Stage of operation: CL
- How discovered: O
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202607072549

## Discrepancy

AIRCRAFT WAS GROUNDED: AIRCRAFT PRESSURIZATION ISSUE. CABIN ALTITUDE WAS STUCK AT 0 DURING CLIMB TO 10000 FT. HAD NO CABIN RATE OF CLIMB DURING THE CLIMB. OUTFLOW VALVE POSITION SHOWED SLIGHTLY OPEN BUT NEVER MOVED UNTIL MANUAL OPERATING IT TO FULL OPEN PRIOR TO LANDING PER QRH. DECESION MADE TO RETURN TO JFK. EMERGENCY DECLARED AND AIRCRAFT LANDED OVERWEIGHT WITHOUT INCIDENT. MAINTENANCE REPLACED CABIN RATE OF CLIMB INDICATOR PER AMM 21-33-01.

---
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.