# SDR ASAA2018060424928

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 4, 2018
- Submitted: June 15, 2018
- Operation: Air carrier
- Aircraft: [N453AS](https://openairdocs.org/aircraft/N453AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36354
- Aircraft time: 17,489 hours, 5,801 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 40631997201AB
- Part serial: 9719710
- Condition: Defective
- Location: Ac Bay
- Part time: 130 hours, 53 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018060424928

## Discrepancy

DURING CLIMB OUT AT APPROX 17,000FT "AUTO FAIL" LIGHT ILLUMINATED, SELECTED "ALTN" PER QRH. SYSTEM APPEARS TO OPERATE "NORMAL" IN "ALTN" MODE. GROUNDED - YES. PERFORMED FIM 21-31 TASK 827, DCPC BITE PER FIM 21-31 TASK 801, FOUND OFV FAULT, CLEARED FAULT ON DCPC AND SYSTEM CHECKED NORMAL. AUTO FAIL LIGHT EXTINGUISHED, A/C OK FOR SERVICE. TSR ISSUED. REMOVED AFT OUT FLOW VALVE ASSY REF MM 21-31-03-000-801. INSTALLED NEW AFT OUTFLOW VALVE REF MM 21-31-03-400-801 STEP 3 F (I) THROUGH (11). INSTALL TEST OF S/N 9719709 FAILED. NR 1 PRESSURE CONTROLLER SHOWS OFV LRU FAIL FAULT CODE 009 AS ACTIVE FAULT. COMPLETED FIM TASK 21-31 TASK 802. REMOVED S/N 9719709 AND INSTALLED S/N 0012501 REF AMM 21-31-03-400-801 OPS CHECKS NORMAL. NO FAULTS NOTED. GROUND VERIFICATION SUCCESSFUL.

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