# SDR AALA2019122649004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 23, 2019
- Submitted: January 2, 2020
- Operation: Air carrier
- Aircraft: [N927NN](https://openairdocs.org/aircraft/N927NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31171
- Aircraft time: 21,136 hours, 8,706 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 21230XXXX
- Part serial: 1391409
- Condition: Faulty
- Location: Cabin Pressure
- Stage of operation: TO
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA2019122649004

## Discrepancy

AIRCRAFT NOT GROUNDED: PILOT REJECTED T/O AT 90 KNOTS DUE TO CABIN PRESSURIZATION FAIL. MAINTENANCE FOUND NR 1 PRESSURIZATION SYSTEM FAULTED DURING BITE CHECK. FOUND OFV LRU FAIL ON NR 1 CONTROLLER. OUTFLOW VALVE NEEDS TO BE REPLACED IAW FIM 21-31-00-810-802. SUPPLEMENTAL INFORMATION: MAINTENANCE REMOVED AND REPLACED OUTFLOW VALVE IAW AMM 21-31-03. OPS TEST GOOD. (CLOSED)

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