SDR UIEA01078

Service difficulty report · Frame · Boeing 7472D3B

Difficulty date
July 25, 2001
Submitted
August 24, 2001
Operation
Air carrier
Aircraft
N506MC
Make and model
Boeing 7472D3B
Aircraft serial
21252
Part
Frame
Part number
65B017155003
Condition
Cracked
Location
Bs 440
Part time
73,880 hours
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 INSPECTION FOUND FRAME AND CHORD CRACKED AT BS 440, STRINGER 13AL/14L. CRACK IS APPROX 1 INCH LONG. CHORD IS COMPLETELY SEVERED. HFEC INSPECTED EXISTING FASTENER HOLE IN FRAME FROM CRACK CONTAINMENT. NO ADDITIONAL CRACKS FOUND. FABRICATED REPLACEMENT DOUBLERS, FILLERS AND TWO NEW STRINGER TIE CLIPS. INSTALLED PER STANDARD PRACTICES. REPLACED SEVERED CHORD WITH NEW CHORD. INSTALLED PER STANDARD PRACTICES IAW SRM. CONTINUE CURRENT INSPECTION REQUIREMENTS PER SB 747-53A2265 UNTIL SB 53-2272 IS COMPLETED AT OR BEFORE 20,000 CYCLES. (M)

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