# SDR FDEA201312303066

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 30, 2013
- Submitted: December 31, 2013
- Operation: Air carrier
- Aircraft: [N321FE](https://openairdocs.org/aircraft/N321FE), registered now
- Make and model: Doug MD-10-30F
- Registry model: [Doug MD-10-30F](https://openairdocs.org/model/mcdonnell-douglas-md-10-30f) (OpenAirDocs)
- Aircraft serial: 47836
- Aircraft time: 93,427 hours, 27,314 cycles
- System (JASC): [7500 · Engine Bleed Air System](https://openairdocs.org/jasc/7500)
- Part: Check Valve
- Part number: 32022001
- Part serial: 2451
- Condition: Failed
- Location: Nr 1 Eng Bleed
- Stage of operation: DE
- How discovered: O
- Nature of condition: E, R, J
- Precautionary procedure: E, F
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA201312303066

## Discrepancy

DURING INITIAL DECENT FROM 350 NR 1 ENGINE BEGAN A THUMPING NOISE ALONG WITH DECAY IN N1 & RISING.  EGT N2 WAS MATCHING NR 2 & 3 ENGINES.  ENGINE SHUTDOWN, CHECKLIST ACCOMPLISHED, MANUAL SHUT DOWN NR 1 ENGINE FIRE BOTTLE DISCHARGED.  REMOVED NR 1 ENGINE LOW PRESSURE BLEED CHECK VALVE IAW AMM 36-11-03-2.  FOUND STOP TUBE INSIDE THE CHECK VALVE SHEARED & MISSING.  NR 1 ENGINE STALL INSPECTION & CHECK CARRIED OUT IAW AMM 72-00-00-6-1.  LOW PRESSURE CHECK VALVE R & R IAW AMM 36-11-03-2.  NR 1 ENGINE IDLE RUN CARRIED OUT IAW JRH.  ALL PARAMETERS & INDICATION NORMAL.  ACFT OK FOR SERVICE.

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