# SDR SWAA2021092708219

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 17, 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): [5330 · Fuselage Main, Plate/Skin](https://openairdocs.org/jasc/5330)
- Part: Skin
- 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/SWAA2021092708219

## Discrepancy

SUPPLEMENTAL INFORMATION: CORROSION AROUND FASTENER AT B.S. 927+8; B.L. 0; W.L. 306.5 ON FUSELAGE SKIN UNDER DORSAL FIN. ; / [01] REMOVED 1 EA FASTENER PER SRM 51-40-02. REMOVED CORROSION AT DISCREPANCY AREA L=0.5' W=0.5'.PERFORMED VISUAL INSPECTION WITH A 10- POWER MAGNIFYING GLASS TO MAKE SURE ALL OF THE CORROSION WAS REMOVED PER SRM 51-10-02 PARAGRAPH 15.A.6.A. NO ADDITIONAL DAMAGE NOTED.; [02] VERIFIED CORRECTIVE ACTION 1; [03] HFEC INSPECTED SKIN BLENDOUT AREA; IAW B737 NDTM P6; 51-00-00 PROC 23. NO DISCREPANCIES NOTED. TOOL ID ATS1465; N600; [04] INSPECTED OPEN HOLE IAW B737 NDTM P6; 51-00-00 PROC 16. NO CRACKS NOTED. TOOL ID ATS1465; N600; TOOL ID ATS1411; MINIMITE; [05] UT INSPECTED SKIN BLENDOUT AREA IAW B737 NDTM P4; 51-00-00 PROC 2. REMAINING MAT. 0.068 TOOL ID ATS2341; E650; [06] EVALUATED DAMAGE AT DISCREPANCY AREA L=0.5' W=0.5' ORIG. THICKNESS 0.071' REMAINING 0.068' LOSS 0.003' FOUND TO BE OUT OF LIMITS DUE TO AREA REMOVAL OF MATERIAL AROUND OF MORE THAN THREE FASTENERS IN ALL GROUP OF TEN IS NOT PERMITTED IAW SRM 53-00-01-1A-1 FIG D.; [07] REF FIG103 DETAIL D.; [08] VERIFIED OUT OF LIMITS CORRECTIVE ACTION 6 AND 7; [09] CORRECTED MEASUREMENTS; [10] INSTALLATION OF 1 EACH FASTENER WAS ACCOMPLISHED ON EA# 21-153-02635-WIP1; [11] REFER TO FAULT TTG8Q006DPMC WHERE EA 21-153-02635 WAS ADDED AS A SUBTASK; [12] VERIFIED CORRECTIVE ACTION ENTRIES 10 & 11.; [13] VERIFIED CARD COMPLETE

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