# SDR SWAA2021091500106

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 30, 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): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Support
- Condition: Corroded
- Location: Bs 500a Rbl 24
- 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/SWAA2021091500106

## Discrepancy

CORROSION ON FLOOR SIDEWALL SUPPORT FWD CARGO BAY BS 500A +10 RBL 24 WL 156 ; / [01] VERIFIED APPLICABILITY OF SRM 53-30-53-0I-2 FOR IDENTIFICATION AN SRM 53-00-53-1A-2 FOR ALLOWABLE DAMAGE; [02] REMOVED CORROSION FROM FLOOR TO SIDEWALL SUPPORT FWD CARGO BAY BS 500A+10'' RBL24 WL156; P/N 143A7501-4; IN AREA 0.5''X.3''X0.018'' DEEP; ORIGINAL THICKNESS 0.040''; FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2; PAR. 4.A(2) FIG. 103 DETAIL A. <BR>TOOL USED: DEPTH GAGE ID:ATS2472; DUE DATE: 06/2022; [03] VERIFIED REMOVED CORROSION FROM FLOOR TO SIDEWALL SUPPORT FWD CARGO BAY BS 500A+10'' RBL24 WL156; P/N 143A7501-4; IN AREA 0.5''X.3''X0.018'' DEEP; ORIGINAL THICKNESS 0.040''; FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2; PAR. 4.A(2) FIG. 103 DETAIL A.; [04] REPLACED FLOOR SIDEWALL SUPPORT FWD CARGO BAY BS 500A +10 RBL 24 WL 156 BY CUSTOMER CARD TTG8Q005ZT13; [05] CORRECTED MEASUREMENT BLOCKS; [06] VERIFIED FLOOR TO SIDEWALL SUPPORT IN FWD CARGO BAY BS 500A +10 RBL 24 WL 156 WAS REMOVED AND REPLACED ON CUSTOMER CARD TTG8Q005ZT13

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