SDR CKSA98044

Service difficulty report · Skin · Boeing 747146

Difficulty date: February 24, 1998
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N703CK
Make and model: Boeing 747146
Aircraft serial: 19727
System (JASC): 5730 · Wing, Plate/Skin
Part: Skin
Condition: Corroded
Location: Lt Wing
Stage of operation: IN
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 CPCP INSPECTION FOUND LEVEL 2 CORROSION, LT OVERWING SKIN AT WBL 128.45 HAS A 4 X 4 AREA OF CORROSION 2 FT FWD OF MID SPAR. REMOVED CORROSION IAW B747 SRM 51-10-1. ULTRASONIC THICKNESS CHECK, MINIMUM NOMINAL THICKNESS AT WING SKIN EDGE .195 TO .230 IN 2.5 BY 3 AREA APPROX. REMOVED AND REPLACED BOLTS IAW B747 51-30-02 AND 51-30-04. REWORKED IAW EA B4-57-021. CORROSION TASK CARD NUMBER C53-190-01 PART 1 OF 2. NON-ROUTINE TASK CARD NUMBER 12599.