# SDR ASAA2015122614455

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 26, 2015
- Submitted: December 30, 2015
- Operation: Air carrier
- Aircraft: [N435AS](https://openairdocs.org/aircraft/N435AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43292
- Aircraft time: 8,539 hours, 2,793 cycles
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Oil Cooler
- Part number: UA5385513
- Part serial: 10829
- Condition: Failed
- Location: Nr 1 Idg
- Part time: 8,539 hours, 2,793 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2015122614455

## Discrepancy

DURING LL2 WALKAROUND, FOUND EVIDENCE OF OIL LEAKAGE IN C DUCT AFT OF IDG OIL COOLER, NO NR 1 ENGINE IDG OIL LEVEL WAS BELOW REFILL LINE BUT STILL ON SIGHT GLASS.  ACFT GROUNDED.  REPLACED NR 1 ENGINE IDG OIL COOLER IAW AMM 24-11-21.  LEAK CK GOOD.

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