# SDR AALA202011069014

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 6, 2020
- Submitted: December 1, 2020
- Operation: Air carrier
- Aircraft: [N817NN](https://openairdocs.org/aircraft/N817NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29558
- Aircraft time: 32,890 hours, 13,286 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Floor Support
- Part number: 147A566043
- Condition: Corroded
- Location: Fuselage
- 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/AALA202011069014

## Discrepancy

AIRCRAFT IN BASE MAINTENANCE.  CORROSION OF INTERCOSTAL AT FASTENER HOLES UNDER FLOOR PANEL BETWEEN STA 951 AND STA 967 AT LBL 20, MEASURING L=2.5 IN, W=2.0 IN, D=0.027 IN.  REPLACED INTERCOSTAL WITH NEW, IAW DRAWING 147A5660 AND B737NG SRM 51-40-10-2R.  SUPPLEMENTAL INFORMATION.  INITIAL REPORT IDENTIFIED AS A LEVEL 2 FINDING IN ERROR, REPORT CORRECTED TO REFLECT PROPER LEVEL.

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