# SDR AALA20160613008

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 9, 2016
- Submitted: June 13, 2016
- Operation: Air carrier
- Aircraft: N564AA
- Make and model: Doug DC-9-83
- Registry model: [Doug DC-9-83](https://openairdocs.org/model/douglas-dc-9-83) (OpenAirDocs)
- Aircraft serial: 49346
- Aircraft time: 90,302 hours, 41,263 cycles
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Generator
- Condition: Out Of Adjust
- Location: Lt Engine
- Stage of operation: CR
- How discovered: O
- Nature of condition: H
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20160613008

## Discrepancy

AIRCRAFT WAS GROUNDED.  DURING CRUISE, CREW REPORTED A CHATTERING SOUND IN COCKPIT, ACCOMPANIED BY NUMEROUS AUDIBLE AND VISUAL WARNINGS.  APU WAS STARTED, LT ENGINE DRIVEN GENERATOR SELECTED OFF AND AC BUS X TIE, OPENED.  EMERGENCY WAS INITIALLY DECLARED BUT SUBSEQUENTLY CANCELLED.  MAINTENANCE REINSTATED THE LT GENERATOR AND FOUND THE FREQUENCY TO BE OUT OF LIMITS.  ADJUSTED FREQUENCY IAW AMM 24-20-00 PARAGRAPH C.  OPS CHECK NORMAL.

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