# SDR ASAA2018051744649

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 14, 2018
- Submitted: May 17, 2018
- Operation: Air carrier
- Aircraft: [N419AS](https://openairdocs.org/aircraft/N419AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41734
- Aircraft time: 20,608 hours, 6,789 cycles
- System (JASC): [5410 · Nacelle/Pylon, Main Frame](https://openairdocs.org/jasc/5410)
- Part: Case
- Condition: Corroded
- Location: Nr 1 Nacelle
- Part time: 20,608 hours, 6,789 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/ASAA2018051744649

## Discrepancy

DURING A NR 1 ENGINE INLET AND FAN BLADES  DETAILED INSPECTION. CORROSION FOUND ON 17  NUT PLATES FOR THE AFT ACOUSTICAL PANELS FROM APPROX 1:30 TO 10:30 O'CLOCK POSITIONS.  AROUND BOTTOM OTBD SIDE OF CASE.  ALSO FOUND THE NR 5 FAN FRAME AT 5 O'CLOCK POSITION HAS LOWER AFT FASTENER INSERT DEBONDED FROM PANEL.  ACFT GROUNDED.  REMOVED AND REPLACED THE NR 1 ENGINE IAW T/C 78471000, AND 78471001.

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