Service difficulty report · Barrier · Boeing 7377H4

Difficulty date
March 16, 2022
Submitted
April 20, 2022
Operation
Air carrier
Aircraft
N472WN
Make and model
Boeing 7377H4
Aircraft serial
33831
Aircraft time
58,559 hours, 34,804 cycles
Part
Barrier
Condition
Cracked
Location
Center Wing
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 VAPOR BARRIER IS CRACKED AROUND LEFT HAND PACK EXHAUST DUCT CUT OUT AT L.B.L. 14; W.L. 150. FORWARD SIDE OF VAPOR BARRIER. / [01] IDENTIFIED PART AND MATERIAL ID PER SRM 57-10-10-0I-2 FIG.2; SHT.1; TABLE 2; AND ITEM 4. FOUND CRACKS TO BE OUT OF ALLOWABLE DAMAGE LIMITS PER SRM 57-10-10-1A-2 PAR.4D(1) AND WILL BE REPAIRED PER SRM 51-70-04 REPAIR 10 AS DIRECTED PER SRM 57-10-10-2R-2 PAR.1 AND 'NOTE'.;[02] REMOVED DAMAGE APPROX. 2.5' X 6.0' ON FWD SIDE; 1.9' X 4.2' ON AFT SIDE WITH NO CONTAMINATION NOTED PER SRM 51-70-04-2R-10 PAR.4 STEPS A-C.;[03] VERIFIED CORRECTIVE ACTIONS 1 AND 2.;[04] FABRICATED REPAIR PIES WITH FIBER GLASS CLOTH BMS 9-3 TYPE H2 CL7 STYLE 1581 LOT# 1475360-2 PER SRM 51-70-04-2R-10 PAR.4 STEP D. OK TO INSTALL REPAIR PLIES.;[05] CORRECTI9ON ON LINE 4; SHOULD BE ' PLIES '.;[06] VERIFIED FABRICATION OF PLIES PER SRM 51-70-04-2R-10; OK TO INSTALL.;[07] INSTALLED REPAIR PLIES; VACUUM BAGGED; LEAK CHECKED GOOD; AND SET TO CURE USING HOT BONDER ID#NCX000523 S/N 11051262 PER SRM 51-70-04-2R-10 PAR.4 STEPS E & F.;[08] CORRECTION ON LINE 7 SHOULD READ ( INSTALLED REPAIR PLIES WITH BMS 8-301 CL1 EA9390 RESIN LOT# JH1GAA7833 ).;[09] VERIFIED CORRECTIVE ACTIONS #7 AND #8;[10] CURED REPAIR; UNBAGGED; LIGHTLY SANDED REPAIR; AND CLEANED PER SRM 51-70-04-2R-10 PAR.4F. REQUEST NDI INSPECTION FOR ANY DEFECTS.

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