# SDR NACA2019122400157

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 24, 2019
- Submitted: January 8, 2020
- Operation: Air carrier
- Aircraft: N401YK
- Make and model: Boeing 737436
- Aircraft serial: 25860
- Aircraft time: 57,186 hours, 36,394 cycles
- Engine: Cfmint CFM563C1
- System (JASC): [7120 · Engine Mount Section](https://openairdocs.org/jasc/7120)
- Part: Fitting
- Condition: Cracked
- Location: Lt Engine
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NACA2019122400157

## Discrepancy

LEFT HAND ENGINE REAR ENGINE MOUNT HANGAR FITTING HAS PITTING CORROSION IN CONE BOLT MATING SURFACE.  REPLACED #1 ENGINE REAR MOUNT HANGAR FITTING IAW B737-400 AMM 71-21-03 REV 90. SEE NDT REPORT NDT19-5645 FOR HANGAR BOLT INSPECTION. NO CRACKS FOUND. NEEDS PART INFO, STILL OPEN

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