# SDR SWAA2021091599411

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 28, 2021
- Submitted: September 15, 2021
- Operation: Air carrier
- Aircraft: [N447WN](https://openairdocs.org/aircraft/N447WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33720
- Aircraft time: 58,733 hours, 34,620 cycles
- System (JASC): [5315 · Fuselage Main, Floor Beam](https://openairdocs.org/jasc/5315)
- Part: Floorbeam
- Part number: 147A55068
- Condition: Corroded
- Location: Bs 986 Rbl 36
- 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/SWAA2021091599411

## Discrepancy

CORROSION ON FLOOR BEAM AT AFT WET AREA BS986.5 RBL36 WL208. ; / [01] REMOVED CORROSION ON FLOOR BEAM AFT WET AREA BS 986.5 RBL 36 WL208 IAW SRM 51-10-02-0G-0 AND EVALUATED AREA AND FOUND TO BE OUT OF LIMITS IAW 53-70-51-1A-1 PART 4H MEASURES L=1'' X W=0.8 X D=0.031'' TOOL USED CALIPER ID:ATS1317 S/N:UNKNOWN; DIAL DEPTH GAUGE ID:NCX000697 S/N: UNKNOWN.<BR>PART REPAIRABLE IAW SRM 53-70-51-2R-4 REPAIR#4; [02] ACCOMPLISHED PERMANENT REPAIR ON FLOOR BEAM AFT WET AREA BS986.5 RBL20-RBL51 WL208 IAW SRM 53-70-51-2R-4 REPAIR#4; IS DOCUMENTED ON TASK CARD# TTG8Q005Z33B; [03] VERIFIED CORRECTIVE ACTION ENTRIES 1 & 2. CARD COMPLETE

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