Service difficulty report · Skin · Boeing 7472D7B

Difficulty date
April 7, 2004
Submitted
April 22, 2004
Operation
Air carrier
Aircraft
N522MC
Make and model
Boeing 7472D7B
Aircraft serial
21783
Engine
Ge CF650E2
Part
Skin
Condition
Dented
Location
Nr 2 Pylon
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

DURING A MAINTENANCE INSPECTION, WRINKLED SKIN/ DENTS WERE FOUND ON THE EXTERIOR SKIN ASSEMBLY OF NR 2 PYLON JUST AFT OF THE TITANIUM DOUBLER, BETWEEN THE MID SPAR CHORD AND NR 5 STIFFENER. AFFECTED SKIN ASSEMBLY WAS TRIMMED TO REMOVE DAMAGE. NDT INSPECTION, INCLUDING HFEC OF SKIN TRIMMED EDGES AND REPAIR FASTENER HOLES WAS ACCOMPLISHED TO ENSURE DAMAGE FREE CONDITION. A NEW SKIN REPAIR DOUBLER ASSEMBLY WAS INSTALLED FROM STA 286 TO STA 300. THE REPAIR DOUBLER ASSY IS MADE FROM TWO STAGGERED LAYERS OF TITANIUM SHEET AND INSTALLED JUS AFT OF THE TITANIUM SKIN DOUBLER EXTENSION. THE REPAIR TITANIUM DOUBLERS ARE ATTACHED TO THE EXISTING TITANIUM DOUBLER EXTENSION WITH A NEW TITANIUM TRIPLER.

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