# SDR SWAA2023020789034
- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 7, 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): [5310 ยท Fuselage Main, Structure](https://openairdocs.org/jasc/5310)
- Part: Web
- 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/SWAA2023020789034
## Discrepancy
CORROSION ON FWD CARGO BAY DOOR CUT-OUT SUB-THRESHOLD WEB FROM STA 440+7 TO STA 480+10; RBL 26 TO RBL 29; WL 156.<[01] VERIFIED APPLICABILITY IAW SRM 53-30-15-0L-1 FOR IDENTIFICATION AND SRM 53-30-15-1A-1 FOR ALLOWABLE DAMAGE.
REMOVED CORROSION ON FWD CARGO BAY DOOR CUT-OUT SUB-THRESHOLD WEB
FROM STA 440+7 TO STA 480+10; RBL 26 TO RBL 29; WL 156.
EVALUATED BLENDED AREA L=1.600' W=1.900' ORIGINAL THICKNESS 0.045' REMAINING 0.039' LOSS 0.006'; MAX MAT REMOVED ALLOWED 0.004'; WAS FOUND OUT LIMITS IAW SRM 53-30-15-1A-1 TABLE 101 PARA 4G (2) FIG 103 DETAIL D.
TOOL ID: ATS1672 S/N: 65092939 DUE:03/2023;[02] INSPECTED ACTION 1;[03] VERIFIED MEASUREMENT TABLE;[04] FABRICATED; LOCATED AND DRILLED NEW THRESHOLD WEB IAW SRM 51-40-05-0G-0 AND DWG 143A8330.;[05] THIS PART WILL BE INSTALLED WITH THE CUSTOMER CARD NBR: 5530-E-16461-NG (TTG8Q004GCTG);[06] VERIFIED CORRECTIVE ACTIONS #4 AND #5;[07] MEASUREMENT TABLE VERIFIED
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