# SDR IPXA2017092021920

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 20, 2017
- Submitted: September 27, 2017
- Operation: Air carrier
- Aircraft: [N256UP](https://openairdocs.org/aircraft/N256UP), registered now
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48405
- Aircraft time: 82,825 hours, 17,088 cycles
- System (JASC): [5210 · Passenger/Crew Doors](https://openairdocs.org/jasc/5210)
- Part: Chain Drive
- Part number: SX657932
- Condition: Unserviceable
- Location: L1 Door
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2017092021920

## Discrepancy

L1 DOOR AFT ELECTRIC MOTOR RUNS SOMETIMES WHEN IT`S NOT SUPPOSED TO.   FOUND THE AFT DRUM & POWER DRIVE SUPPORT ASSY CHAIN UNSERVICEABLE.  REPLACED THE CHAIN IAW AMM 52-11-09. TESTED GOOD.

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