SDR UALA2011082604576

Service difficulty report · Skin · Boeing 747422

Difficulty date: August 26, 2011
Submitted: August 29, 2011
Operation: Air carrier
Aircraft: N171UA
Make and model: Boeing 747422
Aircraft serial: 24322
Aircraft time: 82,835 hours, 9,879 cycles
Engine: Pwa PW4056
System (JASC): 5730 · Wing, Plate/Skin
Part: Skin
Condition: Corroded
Location: Rt Wing
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

RT UPPER WING SURFACE HAS CORROSION JUST FWD OF DOOR 3R APPROX 2FT OUT FROM WING ROOT. BLENDED AREA, PERFORMED ULTRA SOUND INSP FOUND .310" MATERIAL REMAINING AT DEEPEST BLENDED AREA. ACP-HFEC SURFACE EDDY CURRENT CHECK FOR CRACKS AT WING SURFACE INDICATED BLEND AREA =REF 747 NDT PT 1 51-06-00, NO CRACKS DETECTED AT THIS TIME. ACCOMPLISHED ROTOPEENING, ALODINE, PRIME AND PAINT. REF EVA-81238 ACCOMPLISHED, CLASSIFIED AS MINOR REPAIR. NO FURTHER ACTION REQUIRED.