SDR UIEA2021020900264

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): 5542 · Rudder, Plate/Skin
Part: Skin
Condition: Debonded
Location: Rudder
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

DISBOND - RUDDER, LOWER RUDDER, LH SURFACE(<P>TRIM OUT THE DAMAGED SKIN (L = 4.5", W = 1.5", RUD STA 63, 40.5" FROM FWD EDGE) AND CLEAN BOND THE REPAIR PLIES WITH FILM ADHESIVE CURE AT 260 DEGREES F FOR 130 MINUTES. MAINTAIN A MINIMUM VACUUM OF 22 IN/HG IAW 747-400F SRM 55-40-01-2R-0 REFER TO SRM 51-70-07-0G-0 REV 90. CONDITION CHECK IS SATISFACTORY.</P>)