# SDR SWAA2020061291628

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 8, 2020
- Submitted: June 12, 2020
- Operation: Air carrier
- Aircraft: [N937WN](https://openairdocs.org/aircraft/N937WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36644
- Aircraft time: 37,531 hours, 22,677 cycles
- System (JASC): [8012 · Engine Start Valves/Controls](https://openairdocs.org/jasc/8012)
- Part: Start Valve
- Part number: 32896305
- Part serial: 9482
- Condition: Faulty
- Location: Nr 1 Engine
- Stage of operation: LD
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2020061291628

## Discrepancy

AFTER DESCENDING FROM FL390 TO FL330 THE NR 1 ENGINE OIL QTY WENT TO 18%. BY THE TIME WE APPROACH FIND IT WENT TO 0% AFTER LANDING IT RETURNED TO 7%. R&R NR 1 ENG STARTER PER AMM 80-11-01 & R&R NR 1 ENG STARTER CONTROL VALVE PER AMM 80-11-03 PERFORMED NR 1 ENG IDLE LEAK CHK AMM 71-00-00 (OPS CHK GOOD NO LEAKS OR DEFECTS AT THIS TIME) STARTER R&R 60576 STARTER VALVE R&R 60577 P/N OFF/ON 3505945-12 S/N OFF GRTA3446C S/N ON A3488C P/N OFF/ON 3289630-5 S/N OFF 9482 S/N ON 414.

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