# SDR ASAA2019071130001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 11, 2019
- Submitted: July 12, 2019
- Operation: Air carrier
- Aircraft: [N538AS](https://openairdocs.org/aircraft/N538AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 41188
- Aircraft time: 28,235 hours, 8,166 cycles
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Idg
- Part number: 761574B
- Part serial: AAAH008655
- Condition: Inoperative
- Location: Nr 1 Engine
- Part time: 28,223 hours, 8,164 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019071130001

## Discrepancy

#1 SOURCE OFF & GEN BUS OFF LIGHTS ILLUMINATE. STARTED APU AND PUT APU GEN ON LT SIDE #1 GEN VOLTAGE WAS NO VOLTS. GROUNDED - YES. BITE CK OF GCU SHOWED IDG FAULT, CLEARED FAULT, RAN ENGINE, IDG OPERATION RESULTED IN SOURCE LIGHT OFF AGAIN. APPLIED ALT DEACTIVATION PROCEDURES REF MX PROGRAM CHAPT 5 05-07-01 TABLE 3 STEP 9. REMOVED AND REPLACED IDG REF AMM 24-11-11. ALT DEACTIVATION PROCEDURES REVERSED. PERFORMED OPERATIONAL TEST REF AMM 24-11-00 OPS AND LK CK'D GOOD.

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