SDR UIEA2021020900262

Service difficulty report · Skin · Boeing 747481F

Difficulty date: February 6, 2021
Submitted: February 10, 2021
Operation: Air carrier
Aircraft: N404KZ
Make and model: Boeing 747481F
Aircraft serial: 34283
Aircraft time: 50,090 hours, 10,098 cycles
System (JASC): 5751 · Ailerons
Part: Skin
Condition: Cracked
Location: Rt Wing 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

CRACK - SKIN, RH WING INBD AILERON LWR SKIN OUTBD EDGE ABOUT L = 20"(<P>REMOVE THE DAMAGED MATERIAL AREA (L = 20", W = 1", D = 3 PLIES AT RH WING INBD AILERON LWR SKIN AFT EDGE 1", INBD EDGE 2") AND CLEAN BOND 3 REPAIR PLIES (L = 3.5", W = 4.5") USE PREPRG LAYUP WITH FILM ADHESIVE CURE AT 260 DEGREES F FOR 130 MINUTES AND MAINTAINED A MINIMUM VACUUM PRESSURE AT 22 N/HG IAW B747-400F SRM 57-60-01-2R-1 REFER TO B747-400F SRM 51-70-07-0G-0 REV 90. CONDITION CHECK IS SATISFACTORY.</P>)