# SDR SWAA2023101901305

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 17, 2023
- Submitted: October 19, 2023
- Operation: Air carrier
- Aircraft: [N8551Q](https://openairdocs.org/aircraft/N8551Q), registered now
- Make and model: Boeing 737-8H4
- Registry model: [Boeing 737-8H4](https://openairdocs.org/model/boeing-737-8h4) (OpenAirDocs)
- Aircraft serial: 36951
- Aircraft time: 19,763 hours, 9,809 cycles
- System (JASC): [5345 · Fuselage, Equipment Attach Fittings](https://openairdocs.org/jasc/5345)
- Part: Mount
- Part number: UNKNOWN
- Condition: Corroded
- Location: Zn 100 Fus Lower
- 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/SWAA2023101901305

## Discrepancy

LEFT AFT LAV AFT OUTBOARD FLOOR MOUNT HAS SURFACE CORROSION PRESENT AROUND OUTER EDGES ON FLOOR BEAM. <BR>(MARKED)<[01] REMOVED CORROSION ON TOP SURFACE OF 947.5 FLOOR BEAM AT LBL 49 TO LBL 53; (REMOVED .109? OF .180?) REMAINING THICKNESS OF .071? WAS FOUND TO BE OUT OF LIMITS PER SRM 53-70-51-1A-1.;[02] VERIFIED C/A 1. DAMAGE OUT OF LIMITS PER SRM 53-70-51-1A-1.;[03] CUT AND REMOVED DAMAGED FLANGES OF THE UPPER CHORD OF THE FLOOR BEAM AT STA. 947.5 FROM LBL 9' TO LBL 59' PER SRM 53-70-81-2R-5; ALTERNATIVE 2.[21] VERIFIED ALL WORK AND WIP1 AND WIP2 OF EA 23-153-02885 IS COMPLETE;[22] SEE ALL STEPS AND CORRECTIVE ACTIONS FOR ACCOMPLISHED WORK. REPAIRED STA 947 FLOOR BEAM FROM LBL 9 TO LBL 59 PER SRM SRM 53-70-51-2R-5 AND EA 23-153-02885 WIP1 AND WIP2;[23] RII INSPECTION PORTION COMPLIED WITH. SEE C/A?S AND STEPS FOR ALL WORK PERFORMED. STA 947 FLOOR BEAM WAS REPAIRED FROM LBL 9 TO LBL 59 PER SRM SRM 53-70-51-2R-5 AND EA 23-153-02885 WIP1 AND WIP2. SEE ALL STEPS AND CORRECTIVE ACTIONS FOR ACCOMPLISHED WORK.

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