# SDR SWAA2021082520442

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 11, 2020
- Submitted: August 25, 2021
- Operation: Air carrier
- Aircraft: [N427WN](https://openairdocs.org/aircraft/N427WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 29831
- Aircraft time: 61,697 hours, 36,249 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Flange
- Condition: Corroded
- Location: Apu Inlet
- 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/SWAA2021082520442

## Discrepancy

***CORROSION*** ON APU INLET MOUNTING FLANGE AT B.S . 1088; R.B.L. 22; WL 270 ON INBOARD FLANGE. / REPAIRED APU INLET MOUNTING FLANGE AT BS 1088; RBL 22; WL 270 INBOARD FLANGE BY REPLACING IAW DRAWING 148A0924 AND SRM 51-40-02-0G-0 STEP 4. 80570U; 31MAR20

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