# SDR UALA2011060102677

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 31, 2011
- Submitted: June 1, 2011
- Operation: Air carrier
- Aircraft: [N772UA](https://openairdocs.org/aircraft/N772UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26930
- Aircraft time: 63,103 hours, 11,533 cycles
- Engine: Pwa PW4077
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Idg
- Part number: 767146A
- Part serial: 421
- Condition: Overserviced
- Location: Nr 1
- Stage of operation: CR
- How discovered: O
- Nature of condition: W
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2011060102677

## Discrepancy

ELEC GEN SYS L IDG HAS DISCONNECTED OR A PROTECTIVE TRIP OF THE GENERATOR CONTROL BREAKER HAS OCCURRED OR A PROTECTIVE TRIP OF THE BTB HAS OCCURRED.  STATUS  MSG01- LATCHED CLIMB MODE DEPENDENT; INTEGRATED DRIVE GENERATOR (L) FREQUENCY IS LOW.  DB- GENERATOR CONTROL UNIT (L)   MSG-2431631 LATCHED CL MODE.  FOUND IDG OVER SERVICED 3 QUARTS.  REPLACED IDG PER AMM.  OPS AND INDICATIONS NORMAL NOW.

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