# SDR ASAA2019071330025

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 13, 2019
- Submitted: July 15, 2019
- Operation: Air carrier
- Aircraft: [N431AS](https://openairdocs.org/aircraft/N431AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43255
- Aircraft time: 22,519 hours, 7,377 cycles
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Oil Cooler
- Part number: UA5385513
- Part serial: 10785
- Condition: Leaking
- Location: Nr 2 Idg
- Part time: 22,516 hours, 7,375 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/ASAA2019071330025

## Discrepancy

FOLLOW-UP TO #2 ENGINE IDG FREQUENT SERVICING. GROUNDED - YES. UPON FURTHER INSPECTION FOUND EVIDENCE OF OIL IN TR NEAR 7 O'CLOCK BLOCKER DOOR AND STREAKING FWD FROM THE IDG AIR/OIL COOLER. PRECAUTIONARY PERFORMED IDG OIL STATIC LEAK CHECK AND FOUND MINIMAL PRESSURE DROP. REMOVED AND REPLACED #2 IDG AIR OIL COOLER REF AMM 24-11-21. LEAK CHECK GOOD.

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