# SDR ASAA2021120937044

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 9, 2021
- Submitted: January 4, 2022
- Operation: Air carrier
- Aircraft: [N435AS](https://openairdocs.org/aircraft/N435AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43292
- Aircraft time: 30,406 hours, 9,693 cycles
- System (JASC): [2410 · Alternator-Generator Drive](https://openairdocs.org/jasc/2410)
- Part: None
- Part number: UA5385513
- Part serial: 4529
- Condition: Leaking
- Location: #1 Engine
- Part time: 54,165 hours, 15,980 cycles
- Stage of operation: IN
- How discovered: O
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021120937044

## Discrepancy

FOLLOW-UP TO #1 IDG FREQUENT SERVICING. FREQUENT SERVICING INCLUDE BEFORE AND AFTER IDG REPLACEMENT. (#PRI2/ETOPS). GROUNDED - YES. FOUND CLEAR EVIDENCE OF A LARGE OIL LEAK FROM THE AIR/OIL COOLER ON #1 ENG. REMOVED AND REPLACED #1 ENG AIR/OIL COOLER REF B737-900 AMM 24-11-21-400-801. LEAKS CHECK GOOD. NO FURTHER DEFECTS OR LEAKS FOUND.

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