# SDR ASAA2018042624397

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 26, 2018
- Submitted: April 27, 2018
- Operation: Air carrier
- Aircraft: [N479AS](https://openairdocs.org/aircraft/N479AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60576
- Aircraft time: 11,304 hours, 3,770 cycles
- System (JASC): [5410 · Nacelle/Pylon, Main Frame](https://openairdocs.org/jasc/5410)
- Part: Nut Plate
- Condition: Corroded
- Location: Fan Case
- Part time: 11,304 hours, 3,770 cycles
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018042624397

## Discrepancy

DURING A NR 1 ENGINE INLET AND FAN BLADES DETAILED INSPECTION,  FOUND 12 NUTPLATES ON AFT OTBD FAN CASE THAT APPEAR TO HAVE CORROSION UNDER & AROUND ON FAN CASE. THE NUTPLATES ARE FOR AFT ACOUSTICAL PANELS BETWEEN THE 1 O'CLOCK TO 10 O'CLOCK POSITIONS. ACFT GROUNDED.  REMOVED & REPLACED THE NR 1 ENGINE IAW TASK CARDS 78471000, 78471001.  COMPLETED GROUND RUN DUCT PURGE IAW EA PWRPL-71, AND EA-11276.

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