Service difficulty report · Vapor Barrier · Boeing 73776Q

Difficulty date
April 11, 2023
Submitted
May 9, 2023
Operation
Air carrier
Aircraft
N551WN
Make and model
Boeing 73776Q
Aircraft serial
30280
Aircraft time
66,624 hours, 41,198 cycles
Part
Vapor Barrier
Condition
Cracked
Location
Zn 100 Fus Lower
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

WING CENTER SECTION - LH VAPOR BARRIER HAS A CRACK BS 663 LBL 15 WL 148 (MARKED)<DAMAGE EXCEEDS ALLOWABLE DAMAGE LIMITS IAW SRM 57-10-10-1A-2 PAR.4 D(1) TO BE REPAIRED IAW SRM 51-70-04-2R-10 AS DIRECTED BY SRM 57-10-10-2R-2 PAR.1 C(NOTE)<BR><BR>REMOVED DAMAGED FIBERS; CLEANED AND PREPARED BOTH SURFACES IAW SRM 51-70-04-2R-10 PAR.4 A-C;[02] VALIDATED APPLICABILITY OF REPAIR TO BE COMPLETED IAW SRM 51-70-04-2R-10.;[03] VERIFIED CORRECTIVE ACTION 1 AND 2 <BR><BR>VALIDATED APPLICABILITY OF REPAIR TO BE COMPLETED IAW SRM 51-70-04-2R-10.;[04] FABRICATED REPAIR PLIES FOR BOTH SURFACES FROM BMS 9-3 ST1581 LOT#1522395-2 IAW SRM 51-70-04-2R-10 PAR.4 D< INSTALLED REPAIR PLIES ON BOTH SURFACES USING BMS8-301 CL1 LOT#JH2EAA8895; VACUUM BAGGED; LEAK CHECKED GOOD USING VACUUM GAUGE ID:ATS2441 DUE:08/2023 IAW SRM 51-70-04-2R-10 PAR.4 D-E SET REPAIR PLIES TO CURE USING HOT BONDER ID:ATS883 DUE:10/2023 IAW SRM 51-70-04-2R-10 PAR.4 F;[09] CURED REPAIR PLIES; REMOVED VACUUM BAGGING MATERIALS AND LIGHTLY SANDED REPAIR AREA IN PREPARATION FOR REFINISHING. WORK ACCOMPLISHED IAW SRM 51-70-04-2R-10 PAR 4.F+H.; RII VERIFIED GOOD INSTALLATION OF REPAIR PARTS IAW SRM 51-70-04-2R-10.;[12] NDT UT INSPECTED REPAIR AREA PER SRM 51-70-04-2R-10 AND SRM 51-70-04-2R-0 PARA 4. O; AND 737 NDTM PART 4; 51-00-02; NO DEFECTS NOTED.<BR>EQUIP ID ATS2341 DUE 06/23;[13] INSPECTED REPAIR AREA PER SRM 51-70-04-2R-10 AND SRM 51-70-04-2R-0 PARA 4. O; REFINISHED REPAIR AREA IAW SRM 51-70-04-2R-10 PAR 4.H.

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