Service difficulty report · Attach Angle · Boeing 7377H4

Difficulty date
July 22, 2021
Submitted
September 15, 2021
Operation
Air carrier
Aircraft
N447WN
Make and model
Boeing 7377H4
Aircraft serial
33720
Aircraft time
58,733 hours, 34,620 cycles
Part
Attach Angle
Condition
Cracked
Location
Bs 663
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

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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