# SDR SWAA2021091597501

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 22, 2021
- Submitted: September 15, 2021
- Operation: Air carrier
- Aircraft: [N447WN](https://openairdocs.org/aircraft/N447WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33720
- Aircraft time: 58,733 hours, 34,620 cycles
- System (JASC): [5340 · Fuselage Main, Attach Fittings](https://openairdocs.org/jasc/5340)
- Part: Attach Angle
- Condition: Cracked
- Location: Bs 663
- 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/SWAA2021091597501

## Discrepancy

B.S. 663 LOWER COMPOSITE BULKHEAD UPPER ATTACH ANGLE IS CRACKED AT L.B.L. 9; W.L. 164. ; / [01] INSTALLED WIRE BUNDLE PROTECTION AROUND THE REPAIR AREA IAW AMM 20-60-07-913-801; [02] TRIMED OUT DAMEGE AREA AT UPPER ANGLE BAPPOR BARRIER BS663 LBL 13 PER SRM 57-10-10-2R-5; [03] VERIFIED REMOVED DAMAGE PER SRM 57-10-10-2R-5 PARA 4 A-B; [04] PERFORM AN OPEN HOLE INSPECTION HFEC PER SRM 57-10-10-2R-5 STEP 4 C; [05] ET INSPECTED HOLES IAW 737 NDTM PART 6 51-00-00 PROCEDURE 23; NO CRACKS NOTED.<BR>CAL ID IS000450 N500D; [06] PERFORM A DETAIL INSPECTION OF THE REPAIR AREA AND THE UNDERLYING STRUCTURE TO MAKE SURE THAT THERE IS NO DAMAGE NOTED PER SRM 57-10-10-2R-5 STEP 4 D; [07] PERFORMED A DETAILED INSPECTION OF THE REPAIR AREA AND UNDERLYING STRUCTURE IAW SRM 57-10-10-2R-5 PARA 4D. NO ADDITIONAL DAMAGE NOTED; [08] REMOVE 24EA FASTENERS FROM REPAIR AREA OF BS 663 UPPER ATTACH ANGLE LBL8- TO- LBL21 IAW SRM 51-40-02-0G-0; [09] FABRICATED LOCATED AND DRILLED [1] REPLACEMENT ANGLE MADE FROM ATSHFAB-101-353; 2024T42#0.063' LOT#1375061-1 AND [2] SPLICE ANGLE MADE FROM ATSHFAB-101-355; 2024T42#0.071' LOT#1397002-2 AT BS 663 BULKHEAD UPPER ATTACH ANGLE LBL8- LBL 21 IAW SRM 57-10-10-2R-5 REPAIR 5 OK TO INSTALL;

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