# SDR SWAA2021111000448

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 27, 2018
- Submitted: May 13, 2022
- Operation: Air carrier
- Aircraft: N777QC
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 30592
- Aircraft time: 63,466 hours, 37,367 cycles
- System (JASC): [5315 · Fuselage Main, Floor Beam](https://openairdocs.org/jasc/5315)
- Part: Floorbeam
- Condition: Corroded
- Location: Bs 328
- 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/SWAA2021111000448

## Discrepancy

CORROSION ON B.S. 328 FLOOR BEAM (UPPER SURFACE) R.B.L. 37; BY FASTENER HOLE. / BS 328 FLOOR BEAM UPPER SURFACE RBL 37. REMOVED CORROSION 1.2' X 1.0' X 0.008'. IAW SRM 51-10-02. ORIGINAL THICKNESS 0.925'; REMAINING THICKNESS 0.117'. FOUND TO BE WITHIN LIMITS IAW SRM 53-10-51-1A-1. UPON INVESTIGATION. CRACK FOND AT FLOOR FLOOR BEAM BS 328 UPPER CHORD RBL 21.5. ACCOMPLISHED; FLOOR BEAM REPAIR UPPER CHORD BETWEEN RB 1.1 AND RBL 60 ON CC# T799656

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