# SDR FDEA201204181470

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 18, 2012
- Submitted: April 18, 2012
- Operation: Air carrier
- Aircraft: N399FE
- Make and model: Doug MD-10-10F
- Registry model: [Doug MD-10-10F](https://openairdocs.org/model/mcdonnell-douglas-md-10-10f) (OpenAirDocs)
- Aircraft serial: 48262
- Aircraft time: 80,853 hours, 27,850 cycles
- System (JASC): [2450 · AC Power Distribution System](https://openairdocs.org/jasc/2450)
- Part: Relay
- Condition: Malfunctioned
- Location: Emergency Power
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA201204181470

## Discrepancy

ON LEVELOFF AT FL 330, BUSS RT EMERGENCY AC OFF INDICATOR ILLUMINATED WITH ALL ASSOCIATED FAILURES.  RAN CHECKLIST, AND DIVERTED IAW GOCC.   TROUBLESHOT IAW FIM 24-25-01,  FOUND REAC SENSE RELAY/INTFC  FAULT CFDS.  R & R SENSING RELAY R2-5157 AND RT EMERGENCY AC BUSS RCCB B1-138 IAW 24-50-01-2.  R & R TRANSFER RELAY R2-18 IAW 24-25-03-2.  PERFORMED EPCU  RTS IAW 24-08-02/501 SATISFACTORY.  ELECTRICAL EMERGENCY POWER SYS TEST PERFORMED IAW 24-00-00-50,  NO DEFECTS  NOTED. TRANSFERRED POWER FROM APU TO EXTERNAL POWER  AND BACK SEVERAL TIMES NO DEFECTS NOTED. ACFT OK TO  CONTINUE.

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