# SDR SWAA2023030694804

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 25, 2023
- Submitted: March 6, 2023
- Operation: Air carrier
- Aircraft: [N955WN](https://openairdocs.org/aircraft/N955WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36671
- Aircraft time: 38,739 hours, 23,607 cycles
- System (JASC): [5310 · Fuselage Main, Structure](https://openairdocs.org/jasc/5310)
- Part: Threshold
- 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/SWAA2023030694804

## Discrepancy

CORROSION ON AFT CARGO BAY DOOR CUT-OUT SUB THRESHOLD WEB FROM STATION 787+9 TO STA 827+17; RBL 21 TO RBL 27; WL 158.<[01] ENTERED MEASUREMENTS;[02] EDIT TO ACTION ITEM 1;[03] 737-700 SRM 53-60-15-1A-1 IS APPLICABLE FOR THIS EVALUATION.<BR>REMOVED FASTENERS ADJACENT TO DAMAGED AREAS IAW SRM 51-40-02.<BR>REMOVED DAMAGE IAW SRM 51-10-02.<BR>CORROSION DAMAGED AREAS MEASURE:<BR>BS 787+9; 0.5' X 0.5' X 0.004'D<BR>BS 787+17; 1.2' X 0.5' X 0.005'D<BR>807+12; 0.5' X 0.5' X 0.008'D<BR>BS 827+19; 0.4' X 0.4' X 0.006'D<BR>BS 807+1; MECHANICAL DAMAGE<BR>ORIGINAL MATERIAL = 0.050' REMAINING MATERIAL = 0.042'<BR>DIAL DEPTH GAGE; ATS2677; SN UNKNOWN; CAL DUE 11/2023;[04] DAMAGE FOUND TO BE OUT OF ALLOWABLE DAMAGE LIMITS IAW SRM 53-60-15-1A-1. MATERIAL LOSS MORE THAN 10%. <BR>REPAIR BY REPLACEMENT IAW SRM 51-10-02.;[05] VERIFIED CORRECTIVE ACTIONS STEPS 3;4. VERIFIED MEASUREMENTS TABLE.;[06] RECEIVED NEW PART. LOCATED; DRILLED AND COUNTERSINKED NEW THRESOLD. IAW SRM 51-40-02;SRM 51-40-05; SRM 51-40-06; SRM 51-40-08.;[07] VERIFIED CORRECTIVE ACTIONS STEP 6.;[08] VERIFIED MEASUREMENT TABLE; ALL STEPS COMPLETE

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.