# SDR ASAA2018011923215

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 19, 2018
- Submitted: January 23, 2018
- Operation: Air carrier
- Aircraft: [N448AS](https://openairdocs.org/aircraft/N448AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36356
- Aircraft time: 7,191 hours, 2,449 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 40631997201AB
- Part serial: 0110562
- Condition: Failed
- Location: Cabin Pressure
- Part time: 20 hours, 8 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018011923215

## Discrepancy

AUTO FAIL LIGHT ILLUMINATED IN CRUISE ALTN CONTROLLER OPERATED NORMALLY. GROUNDED - YES. NR 2 DPCP SHOWS "OFV LRU FAIL" AS AN EXISTING FAULT AND PREVIOUS FLIGHT LEG, REF FIM 21-31 TASK 801. AC CHECKED AND RELEASED PER MEL 21-14C, NR 2 AUTOMATIC CABIN PRESSURIZATION MODE INOP. REMOVED AND REPLACED AFT OUTFLOW VALVE REF AMM 21-31-03. OPS CHK GOOD. BITE CHK PASS. THIS CLEARS MEL 21-14C.

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