# SDR ASAA2021040734551

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 7, 2021
- Submitted: May 4, 2021
- Operation: Air carrier
- Aircraft: [N435AS](https://openairdocs.org/aircraft/N435AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43292
- Aircraft time: 28,142 hours, 9,031 cycles
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Idg
- Part number: 761574B
- Part serial: AAAH009890
- Condition: Failed
- Location: Nr 1 Generator
- Part time: 28,153 hours, 9,034 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021040734551

## Discrepancy

WITH #1 ENG GENERATOR SELECTED GEN OFF BUS LIGHT ILLUMINATED-AC AMPS AND AC VOLTS INDICATED ZERO. GROUNDED - YES. REMOVED AND REPLACED #1 ENGINE IDG IAW B737-900ER AMM 24-11-11. OPERATIONAL TESTS GOOD. RE-INSTLALED/RE-ACTIVATED GEN DRIVE (AMBER) AND GEN OFF BUS (BLUE) LIGHTS, REF MEL 24-1B.

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