Service difficulty report · Exhaust Pipe · Boeing 74747UF

Difficulty date
September 17, 2012
Submitted
September 17, 2012
Operation
Air carrier
Aircraft
N477MC
Make and model
Boeing 74747UF
Aircraft serial
29255
Aircraft time
59,150 hours, 10,530 cycles
Engine
Ge CF680C2B1F
Part
Exhaust Pipe
Condition
Cracked
Location
Nr 2 Engine
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

THERE IS A CRACK ON THE EXHAUST NOZZLE OUTER SLEEVE OF NR 2 ENGINE, APPROX 9 O'CLOCK TO 12 O'CLOCK POSITION (LT SIDE). THE CRACK IS APPROX 16" LONG AND IS 13" FROM AFT SIDE OF EXHAUST SLEEVE IAW SRM 54-41-30 THE DISTANCE BETWEEN THE CRACK AND THE EDGE IS OUT OF LIMITS. DISPOSITION IS TO STOP DRILL THE ENDS OF THE CRACK WITH A 0.125" DIAMETER HOLE, DVI EVERY 3 FLIGHT CYCLES; AND REMOVAL OF THE PART WITHIN 50 FC (FLIGHT CYCLES) IAW EO 4478A235.

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