SDR 2007UALA01270

Service difficulty report · Lug · Boeing 747422

Difficulty date: April 24, 2007
Submitted: May 1, 2007
Operation: Air carrier
Aircraft: N178UA
Make and model: Boeing 747422
Aircraft serial: 24385
Aircraft time: 70,710 hours, 8,761 cycles
Engine: Pwa PW4056
System (JASC): 5415 · Nacelle/Pylon, Attach Fittings
Part: Lug
Condition: Corroded
Location: Nr 1 Pylon
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

BORE CORRODED AND SCRATCHED - NR 1 PYLON STRUT FITTING BEARING LUG, BOTH SIDES. [SUP 05-16-07] BORE CORRODED AND SCRATCHED - NR 1 PYLON STRUT FITTING BEARING LUG, BOTH SIDES. ACCOMPLISHED BORING THE DSB UNDER WING FITTINGS PER COA 899993040 & SB 747-54A2218. FINAL HOLE DIA AFTER HONE: INBD=2.2750" OUTBTD=2.2450". CORROSION & VIBRATION AGGRAVATED BY HIGH TEMP CAUSED DUAL SIDE BRACE HOLE SURFACE DETERIORATION.