# SDR SWAA2021092708621

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 18, 2021
- Submitted: April 29, 2022
- Operation: Air carrier
- Aircraft: [N208WN](https://openairdocs.org/aircraft/N208WN), registered now
- Make and model: Boeing 737
- Aircraft serial: 29856
- Aircraft time: 52,294 hours, 30,932 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Rail
- Condition: Corroded
- Location: Fuselage
- 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/SWAA2021092708621

## Discrepancy

SUPPLEMENTAL INFORMATION: CORROSION ON RAIL AT AFT CARGO BAY BS773 LBL3 WL157. ; / [01] REMOVED CORROSION ON AFT CARGO BAY RAIL BS 773 LBL3 WL 157. AREA DIMENSIONS D=0.010' X LENGTH=3' X W=0.9'. ORIGINAL THICKNESS 0.063' REMAINING THICKNESS 0.053'. FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 PARAGRAPH 4A(2) FIGURE 103 DETAIL A; B; C; D; AND E. DEPTH GAUGE USED ID: ATS400.; [02] VERIFIED DAMAGE REMOVAL OUT OF LIMITS PER SRM 53-00-53-1A-2; [03] PERFORMED CUT OUT ON RAIL AT AFT CARGO BAY BS773 LBL3 WL157. I.A.W SRM 53-00-53-2R-2; REPAIR 2; ALTERNATIVE 5 DETAIL F.; [04] VERIFIED DAMAGE REMOVED PER SRM 53-00-53-2R-2; [05] REQUEST NDI CUT OUT FREE CRACK CONDITION ON RAIL AT AFT CARGO BAY BS773 LBL3WL157. I.A.W. SRM 53-00-53-2R-2;REPAIR 2;REPAIR INSTRUCTIONS 4; STEP E.; [06] HFEC INSPECTED RAIL CUTOUT AREA; IAW B737 NDTM P6; 51-00-00 PROC 23. NO CRACKS NOTED. TOOL ID ATS1465; N600; [07] FABRICATED; LOCATED AND DRILLED CHANNEL REPAIR ITEM #53100004-001; LOT 1461073-1; AT AFT CARGO BAY BS773 LBL3 WL 157.I.A.W SRM53-00-53-2R-2 REPAIR 2; ALTERNATIVE 5. OK TO INSTALL;

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