SDR UPS02439581

Service difficulty report · Longeron · Boeing 747121

Difficulty date: September 14, 2002
Submitted: October 4, 2002
Operation: Air carrier
Aircraft: N683UP
Make and model: Boeing 747121
Aircraft serial: 20353
Aircraft time: 81,157 hours, 20,074 cycles
System (JASC): 5313 · Fuselage Main, Longeron/Stringer
Part: Longeron
Condition: Cracked
Location: Fuselage
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

DURING C CHECK, CRACK FOUND AT RT SIDE OF BS 1350 OVERWING LONGERON, THE CRACK FOUND INITIATED FROM FWD EDGE OF VERTICAL FLANGE RUNNING TOWARD AFT TO I/B HORI FLANGE, TOTAL LENGTH OF CRACK 2 INCH LONG APPROXIMATELY. BS 1350 RT OVERWING LONGERON UPPER CHORD CRACKED AND CORRODED INTERIM REPAIR CARRIED OUT AS PER HX RS R-53-41-34906 & EA 747-53-20110 REPEAT INSPECTIONS EVERY 2000 FLTS PER REF 'F' SB747-53-2291 APPLY.