# SDR SWAA2023020788649

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 5, 2023
- Submitted: February 7, 2023
- Operation: Air carrier
- Aircraft: [N209WN](https://openairdocs.org/aircraft/N209WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 32484
- Aircraft time: 59,684 hours, 35,490 cycles
- System (JASC): [5315 · Fuselage Main, Floor Beam](https://openairdocs.org/jasc/5315)
- Part: Beam
- Part number: NOTREPORTED
- Part serial: NOTREPORTED
- 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/SWAA2023020788649

## Discrepancy

CORROSION AFT WET AREA FLOOR BEAM BS986 LBL 29; 32; 35; 38; 41<[01] VERIFIED THE APPLICABILITY OF SRM 53-70-51-0I-1 AND SRM 53-70-51-1A-1;[02] REMOVED CORROSION ON AFT WET AREA FLOOR BEAM BS986 LBL 29 ; 32 ; 35 ; 38 ; 41 ; (5EA) AREAS OF 1.0'X1.0' IAW SRM 51-10-02 ; ORIGINAL THICKNESS IS 0.150' MAXIMUM MATERIAL LOSS 0.105' REMAINING THICKNESS IS 0.045' ; FOUND TO BE OUT OF LIMITS IAW SRM 53-70-51-0I-1 AND SRM 53-70-51-1A-1 <BR>MEASURING TOOL USED :<BR>ID :ATS2473<BR>S/N :UNKNOWN<BR>DATE :08/2022<BR>DUE :08/2023;[03] VERIFIED CORRECTIVE ACTION #1; #2.;INSTALLED BS 986.5 UPPER CHORD FLOOR BEAM REPAIR IAW SRM 51-40-02-0G-0; IAW SRM 53-70-51-2R-4 REPAIR 4 AND IAW EA# 23-153-00088-WIP1.

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