SDR UALA2010021100520

Service difficulty report · Torque Box · Boeing 747451

Difficulty date: February 10, 2010
Submitted: February 15, 2010
Operation: Air carrier
Aircraft: N105UA
Make and model: Boeing 747451
Aircraft serial: 26473
Aircraft time: 63,567 hours, 7,615 cycles
Engine: Pwa PW4056
System (JASC): 5310 · Fuselage Main, Structure
Part: Torque Box
Condition: Cracked
Location: Bs 860
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

FWD CARGO PIT STA. 860 BETWEEN LBL 5.5 AND RBL 5.5 HAS SUSPECTED CRACK ALONG FWD EDGE OF CTR GUIDE ON TORQUE BOX WEB. REMOVED TORQUE BOX ACCESS PNL AND STARTED TO REMOVE FASTENERS FOR REPAIR. REMOVED TORQUE BOX DAMAGED UPPER WEB SECTION. MFG REPLACEMENT SKIN AND SPLICE DOUBLER IAW SRM FOR TYPICAL WEB REPAIRS. ALL COMPONENTS NEED TO BE REINSTALLED. BEGAN INSTALLING DBLR AND ROLLER TRAY ASSY. COMPLETED INSTALLATION OF FASTENERS IN ROLLER TRAYS AND INSTALLED PANEL.