SDR UPS00434011

Service difficulty report · Doubler · Boeing 747121

Difficulty date: July 24, 2000
Submitted: October 13, 2000
Operation: Air carrier
Aircraft: N691UP
Make and model: Boeing 747121
Aircraft serial: 19641
Aircraft time: 95,273 hours, 22,812 cycles
System (JASC): 5310 · Fuselage Main, Structure
Part: Doubler
Condition: Cracked
Location: Nlg Ww
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

INSPECTION TYPE:C, NLG CRACK FOUND ON THE FWD LOWER CORNER STRUCTURE OF THE WHEEL WELL LT SIDE. CRACK EXTENDS UNDER THE LOWER CHORD OF THE BULKHEAD. CRACKS ARE PERMITTED IAW SB 747-53-2112 R3 IN UNDER SKIN DOUBLER. PREVIOUS MODIFICATION ACCOMPLISHED IAW UPS EO B747-5330-0367 SECTION 6.