Service difficulty report · Frame · Boeing 7472D7B

Difficulty date
July 27, 2011
Submitted
August 10, 2011
Operation
Air carrier
Aircraft
N524MC
Make and model
Boeing 7472D7B
Aircraft serial
21784
Aircraft time
105,635 hours, 21,872 cycles
Engine
Ge CF650*
Part
Frame
Part number
65B01731228
Condition
Cracked
Location
Bs 760 S6l
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

FRAME AT BS 760 BETWEEN S-5R AND S-7R FOUND CRACKED AND WAS FOUND DURING THE SECTION 42 UPPER LOBE INSPECTION ACCOMPLISHED IAW EO 4753A165, REV C (SB 747-53-2349 REV 3, AD 2009-18-07). THE CRACK WAS LOCAL ONLY TO THE FRAME PN AND WAS LOCATED AT S-6R. THE CRACK WAS APPROX 0.75 INCH IN LENGTH. THE SUBJECT DAMAGE WAS RECORDED ON NRC 511483. THE CRACKED WEB WAS REPAIRED IAW SRM 53-10-04, FIG 54. THE SRM REPAIR STOP DRILLS THE CRACK AND INSTALLS A DOUBLER OVER THE AREA.

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