Service difficulty report · Vapor Barrier · Boeing 7378H4

Difficulty date
November 7, 2020
Submitted
November 11, 2020
Operation
Air carrier
Aircraft
N8311Q
Make and model
Boeing 7378H4
Aircraft serial
38808
Aircraft time
28,528 hours, 12,692 cycles
Part
Vapor Barrier
Condition
Cracked
Location
Bs 663.75
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

RIGHT WHEEL WELL VAPOR BARRIER CRACKED AT BS 663.75 BETWEEN RBL 31.83 AND RBL 45.64 8 INCHES ABOVE LOWER PANEL. CRACK MEASURES 14 INCHES, PERFORMED INTERIM REPAIR BY APPLYING BMS SEALANT AND ONE PLY OF BMS 9-3 FIGERGLASS CLOTH TO DAMAGED AREA, PER SRM 57-10-10-1A-2. CRACK AT BS 663.75 BETWEEN RBL 31.83 AND RBL 45.64 HAS THE UPPER END OF THE CRACK STOPPING AT OUTBOARD FASTENER OF CANNON PLUG AND AT LOWER HORIZONTAL STIFFNER ANGLE FASTENER. REPETITIVE ACTION: DO A VISUAL INSPECTION OF THE REPAIR AREA AT 1;200 FLIGHT CYCLES INTERVALS OR MORE FREQUENTLY. MAKE SURE THAT CRACK HAS NOT GROWN PAST THE INTERIM SEAL. REFER TO PARAGRAPH 4/ALLOWABLE DAMAGE 2 FOR ALLOWABLE DAMAGE LIMIT. IF THE TOTAL CRACK LENGTH IS MORE; DO A PERMANENT REPAIR AS GIVEN IN 51-70-04, REPAIR 10 TO REMOVE CRACK.

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