# SDR ASAA2021030934269

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 9, 2021
- Submitted: March 16, 2021
- Operation: Air carrier
- Aircraft: [N419AS](https://openairdocs.org/aircraft/N419AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41734
- Aircraft time: 29,614 hours, 9,546 cycles
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Idg
- Part number: 761574B
- Part serial: AAAH011549
- Condition: Inoperative
- Location: Nr 1 Generator
- Part time: 20,034 hours, 6,438 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021030934269

## Discrepancy

CRUISE FL 380, MASTER CAUTION ELEC, SOURCE LT + DRIVE LT ENG #1 ILLUMINATED. QRH DISCONNECTED IDG 1 AND COVERED BUS W/ APU. GROUNDED - YES. REPLACED IDG AIR/OIL COOLER REF B737-900 AMM 24-11-21-000-801. REMOVED AND REPLACED #1 ENG IDG REF AMM 24-11-11. PERFORMED ENGINE TEST 3A IDLE LEAK CHECK AND IDG OPERATIONAL TEST PER AMM 24-11-00-700-802. LEAK AND OPS CHECK GOOD NO FURTHER DEFECTS NOTED.

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