Service difficulty report · Vapor Barrier · Boeing 7377H4

Difficulty date
June 18, 2022
Submitted
July 27, 2022
Operation
Air carrier
Aircraft
N486WN
Make and model
Boeing 7377H4
Aircraft serial
33852
Aircraft time
59,624 hours, 35,506 cycles
Part
Vapor Barrier
Condition
Cracked
Location
Fuselage
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

CRACKED LOWER L/H COMPOSITE BULKHEAD AT BS663 LBL46 WL164. / [01] REMOVED LOWER L/H COMPOSITE BULKHEAD (VAPOR BARRIER) BTW LBL8.- LBL70. BS 663.75 WL 164. IAW SRM 51-40-02.;[02] CRACKED LWR L/H COMPOSITE BULKHEAD AT B.S. 663 L.B.L. 46; W.L. 164; FOUND TO BE OUT LIMITS DUE TO NO ENTRIES ALLOWABLE DAMAGE IN SRM; IT WILL BE REPAIRABLE BY REPLACEMENT I.A.W. SRM 51-10-02-0G PAR. 9C.;[03] CORRECTED REFERENCE: CRACKED LWR L/H COMPOSITE BULKHEAD AT B.S. 663 L.B.L. 46; W. L. 164; FOUND TO BE OUT OF LIMITS BY DAMAGE LOCATION; WILL BE REPAIRABLE BY REPLACEMENT I.A.W. SRM 57-10-10-1A-2 PARAGRAPH 9C.;[04] CORRECTIVE ACTION 2 AND 3 ENTRIES AN ERROR. EVALUATED DAMAGED AT DISCREPANCY AREA AND FOUND OUT OF LIMITS DUE TO CRACKS ARE NOT PERMITTED AT DISCREPANCY AREA I.A.W. SRM 57-10-10-1A-2 ZONE 1 FIG 101 DETAIL B.;[05] VERIFIED CORRECTIVE ACTION 4;[06] VERIFIED MEASUREMENT TABLE;[07] PARTIALLY COMPLETED STEP 6;[08] RECEIVED NEW LH VAPOR BARRIER P/N ATSHFAB -101-201 LOCATED AND DRILLED IAW SRM 51-40-05-0G-0 AND DWG#111A1001 OK TO INSTALL LOWER CHORD ON STEP-6;[18] INSTALLED L/H VAPOR BARRIER IAW SRM 51-40-02; DWGS # 111A100; 111A1001 AND COMPLETED STEPS 1;2;3;4;5;6;7.;

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