# SDR FDEA202609191372

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 19, 2026
- Submitted: September 21, 2026
- Operation: Air carrier
- Aircraft: [N605FE](https://openairdocs.org/aircraft/N605FE), registered now
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48514
- Aircraft time: 98,503 hours, 24,078 cycles
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Gcu
- Part number: 750864D
- Part serial: 0285
- Condition: Failed
- Location: N/A
- Stage of operation: CR
- How discovered: O
- Nature of condition: J, G
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA202609191372

## Discrepancy

AC BUSS 3 OFF LEVEL 1. BUSS DID NOT FAIL UNTIL  MULTIPLE ITEMS ON BUSS FAILED OVER A PERIOD OF ABOUT  7 MINUTES.   FIRST OIL PRESS 3, THEN ICE DET  SINGLE, THEN FO RA, THEN TANK 1 PUMPS LO, THEN AUTO  SLAT FAIL, THEN AUTOTHROTTLES FAILED, THEN NO  AUTOLAND,  THEN AC BUSS ACTUALLY FAILED WITH THE BUSS  AC 3 OFF ALERT.  PERFORMED FIM 24-20-12, REMOVED AND REPLACED NR 3 GCU IAW AMM 24-21-03, RAN ALL 3 ENGINES PER JRH FOR 10  MINS NO DEFECT NOTED ALL ITEM WORKED AND NO AC BUS  3 LIGHT NO MESSAGES.

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