# SDR ASAA2020082433050

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 4, 2020
- Submitted: August 24, 2020
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 50,233 hours, 14,846 cycles
- System (JASC): [5330 · Fuselage Main, Plate/Skin](https://openairdocs.org/jasc/5330)
- Part: Skin
- Part number: 147A34004
- Condition: Corroded
- Location: Bs 907-927
- 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/ASAA2020082433050

## Discrepancy

AIRCRAFT SKIN CORRODED AROUND LAV EXHAUST VENT.  GROUNDED - YES.  REMOVED DAMAGE AND CHECKED LIMITS.  ORIGINAL THICKNESS IS .125, REMAINING IS .098, .027 WAS REMOVED.  FOUND TO BE OUT OF LIMITS, REF B737-800 SRM 53-00-01-1A-1.  CUTOUT DAMAGE AND REPAIRED SKIN, REF B737-800 SRM 53-70-01-2R-3.  THIS IS A CATEGORY "B" REPAIR WITH AN INSPECTION THRESHOLD OF 50,000 FLIGHT CYCLES.

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