# SDR SWAA2021111538858

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 30, 2021
- Submitted: November 15, 2021
- Operation: Air carrier
- Aircraft: [N915WN](https://openairdocs.org/aircraft/N915WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36888
- Aircraft time: 45,503 hours, 27,299 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Intercostal
- Condition: Corroded
- Location: Bs 767
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2021111538858

## Discrepancy

CORROSION FOUND ON INTERCOSTAL AT RBL 20; WL153; STA767+5 AND STA767+6 ; / [01] REMOVED INTERCOSTAL FROM BS 767 TO BS 867; RBL 20; WL 153 IAW SRM 51-40-02-0G-0; [02] VERIFIED COMPLETE STEPS 1; 2.; [03] REMOVED CORROSION FROM INTERCOSTAL AFT CARGO BAY BS767+5'' RBL20 WL153; P/N 146A8123U19; IN AREA .7''X.3''X0.020'' DEEP; ORIGINAL THICKNESS 0.063''; REMAINING MAT. THICKNESS 0.043' FOUND TO BE OUT OF LIMITS IAW SRM 53-00-04-1A-1 STEP 4.B. (2) FIGURE 102. TOOL USED: DEPTH GAGE ID:ATS2472; DUE DATE: 06/2022; [04] VERIFIED CORRECTIVE ACTION ENTRY 3.; [05] RECEIVED NEW INTERCOSTAL LOCATED AND DRILLED MAT. ITEM#146A8123U19; LOT#1470503-2 FROM BS767 TO BS787 RBL 20 WL 153 IAW.SRM 51-40-05-0G-0; DWG 146A8123; [06] VERIFIED DRILLED MAT. ITEM#146A8123U19; LOT#1470503-2 FROM BS767 TO BS787 RBL 20 WL 153 IAW.SRM 51-40-05-0G-0; DWG 146A8123.; [07] OK TO INSTALL NEW INTERCOSTAL.; [08] VERIFIED OK TO INSTALL.; [09] INSTALLED NEW INTERCOSTAL AFT CARGO BAY AT BS 767 TO BS 787 RBL 20 WL 153 IAW SRM 51-40-02-0G-0 DWG 146A0081; [10] VERIFIED INSTALLATION OF NEW INTERCOSTAL AFT CARGO BAY AT BS 767 TO BS 787 RBL 20 WL 153 IAW SRM 51-40-02-0G-0 DWG 146A0081; [11] TASK COMPLETE

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