# SDR WRNA201200015

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 16, 2012
- Submitted: December 13, 2012
- Operation: Air carrier
- Aircraft: N953AR
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48520
- Aircraft time: 48,950 hours, 12,588 cycles
- System (JASC): [2450 · AC Power Distribution System](https://openairdocs.org/jasc/2450)
- Part: Control Unit
- Condition: Malfunctioned
- Location: Electrical Sys
- Stage of operation: CR
- 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/WRNA201200015

## Discrepancy

WHILE IN FLIGHT, LEVEL 2 "GEN BUS 3 FAULT" ILLUMINATED.  DEPLOYED ADG AND RETURNED TO FIELD (MIA) FOR SAFE LANDING.  REPLACED EPCU IAW AMM 24-08-01, GROUND RUN ENGINES, NO DEFECTS NOTED.  STOWED ADG IAW AMM 24-25-01.  AIRCRAFT RETURNED TO SERVICE.

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