# SDR UIEA2021042000938

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 20, 2021
- Submitted: April 23, 2021
- Operation: Air carrier
- Aircraft: [N1373A](https://openairdocs.org/aircraft/N1373A), registered now
- Make and model: Boeing 767-31K
- Registry model: [Boeing 767-31K](https://openairdocs.org/model/boeing-767-31k) (OpenAirDocs)
- Aircraft serial: 27205
- Aircraft time: 103,791 hours, 22,037 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Contactor
- Part number: CC0708IMUA34B
- Part serial: N377
- Condition: Failed
- Location: Apu
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2021042000938

## Discrepancy

APU FAIL TO START(<P>TRANSFERRED TO MDDR 145605 IAW MEL 49-11-01A, CAT C.</P><P>LP 1312947: PERFORMED FIM 49-11 FT. 991 TO STEP 22. REMOVED AND REPLACED APU CRANK CONTACTOR K117 IAW AMM 49-41-05. OPS CHECKS GOOD. 3 SUCCESSFUL START ATTEMPTS. MDDR 145605 CLOSED.<BR /></P>)

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