# SDR CALA2021080601273

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 6, 2021
- Submitted: August 6, 2021
- Operation: Air carrier
- Aircraft: [N57864](https://openairdocs.org/aircraft/N57864), registered now
- Make and model: Boeing 757-33N
- Registry model: [Boeing 757-33N](https://openairdocs.org/model/boeing-757-33n) (OpenAirDocs)
- Aircraft serial: 32588
- Aircraft time: 62,051 hours, 19,081 cycles
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Idg
- Part number: 727792N
- Part serial: 1532
- Condition: Failed
- Location: Lt Generator
- 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/CALA2021080601273

## Discrepancy

AUTO PILOT AND AUTO THROTTLE DISCONNECT LT GEN DISCONNECT ALSO R ESET GEN REMOVED AND REPLACED LEFT ENGINE IDG PER AMM 24-11-01. NO HELP. INSTALLED IDG WILL NOT PRODUCE ANY VOLTS OR FREQ''S AS WELL. TRIED KNOWN WORKING GCU''S AND SENT SERVICEABLE GCU PER AMM 24-22-02 STILL IDG STILL WILL NOT SHOW ANY VOLTS OR FREQ''S. INSPECTED ALL FEEDER LINES AND CANON PLUGS FOR CORROSION NO GENERATOR, INTE DEFECTS AT THIS TIME.  ALL C/B''S ARE FOUND IN THE CLOSED POSITION ASSOCIATED WITH THE LEFT POWER GENERATION . WILL REQUIRE FURTHER TROUBLESHOOTING. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1981841  SN OFF 1532 RESET BUS TIE SWITCHES AND UTILITY SWITCHES PRIOR TO START A/C POWER . RAN #1 ENGINE PER AMM 71-00-00. ALL OPERATIONAL CHECKS NORMAL FOR LEFT IDG COMING ONLINE AND DISCONNECT . LEFT ENGINE IDG OPS CHECKS NORMAL. AIRCRAFT RETURNED TO SERVICE AFTER TALKING WITH TOMC.

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