Service difficulty report · Vapor Barrier · Boeing 7377BD

Difficulty date
December 2, 2022
Submitted
January 10, 2023
Operation
Air carrier
Aircraft
N7742B
Make and model
Boeing 7377BD
Aircraft serial
33928
Aircraft time
51,537 hours, 27,573 cycles
Part
Vapor Barrier
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

2 CRACKS FOUND AT EXTERNAL LOWER LT VAPOR BARRIER WEB STA 663 OPEN HOLE LOCATION LBL 6 AND LBL 7; MARKED. 2 CRACKS FOUND AT EXTERNAL LOWER LT VAPOR BARRIER WEB STA 663 OPEN HOLE LOCATION LBL 6 AND LBL 7 MARKED.<[01] FORMED REPLACEMENT ANGLE & SPLICE ANGLE FOR REPAIR AT LT VAPOR BARRIER ATTACH ANGLE; AS PER SRM. 57-10-10-2R-5 REPAIR 5; TABE 201; FIG. 202 AND SRM. 51-30-01-0G-0; MATERIAL USED 2024T3 ;063' & ;071' CLAD.FABRICATED FILLER AND DOUBLE REPAIR AS PER SRM 57-10-10-2R-5 REPAIR 5 TABLE 201 FIG 202.;[11] VERIFIED STEP 10 FABRICATION OF REPAIR PARTS;[12] OK TO TREAT AND PRIME REPAIR PARTS;[13] TREATED AND PRIMED AS REQUIRED AS PER SRM 51-20-01-0G-0 & AMM 51-21-72-370-803 ] INSTALLED REPAIRS PARTS REF SRM 57-10-10-2R-5 REPAIR 5 FIG 202 ;DETAIL 'B'<BR><BR>SEALANT APPLICATION :MIX TIME 14:00 APPLICATION 14:15 SQUEEZE OUT 14:30 12/13/2022 REF SOPM 20-50-19;CAP SEALED FUEL TANK FASTENERS AS PER SRM 51-80-01;[18] PERFORMED ELECT. RESISTANCE CHECK OF THE ELECT. BONDING FASTENERS: PASSED; IN REF. SWPM 20-20-00. TOOL USED: B/C: 163055ACCOMPLISHED REPAIR AS PER SRM 57-10-10-2R-5 REPAIR 5; FIG. 202. DETAIL: 'B'.;[22] ADD INF. ON STEP #10: ACCOMPLISHED ROUGHNESS TEST ON CUT OUT AREA 63 MICROINCHES RA AND REPAIR PARTS 125 MICROINCHES RA REF SRM 51-20-13-0G-0. TOOL ID# 172329

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