Service difficulty report · Skin · Boeing 747422

Difficulty date
October 28, 2010
Submitted
November 17, 2010
Operation
Air carrier
Aircraft
N178UA
Make and model
Boeing 747422
Aircraft serial
24385
Aircraft time
84,587 hours, 10,298 cycles
Engine
Pwa PW4056
System (JASC)
5751 · Ailerons
Part
Skin
Condition
Delaminated
Location
Lt Aileron
Stage of operation
IN
How discovered
V
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

HAIL DAMAGE INSP FOUND ON THE LT O/B AILERON ABOUT 132 SPOT DELAMINATION ON THE UPPER SURFACE NO HOLES. AREA INVOLVED IS THAT OF THE OTBD AILERON UPPER SURFACE ONLY BETWEEN WS 1224.00 AND 1551.25 SPECIFICALLY. IMPACTED AREAS ARE OF AN AVERAGE OF .008 IN DEPTH AND 1 INCH IN DIAMETER. THERE IS DELAMINATION AT THE IMPACT AREA OF EACH SPOT WITH NO PENETRATION AT ANY IMPACT. ACCOMPLISHED REPAIR PER SRM ON OV WU B8478W.