Service difficulty report · Sleeve · Boeing 74747UF

Difficulty date
September 2, 2012
Submitted
September 3, 2012
Operation
Air carrier
Aircraft
N412MC
Make and model
Boeing 74747UF
Aircraft serial
30559
Aircraft time
55,329 hours, 8,300 cycles
Engine
Ge CF680C2B1F
Part
Sleeve
Condition
Cracked
Location
Nr 3 Exhaust
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

A CRACK WAS FOUND ON THE EXHAUST NOZZLE OUTER SLEEVE, APPROX AT 1 O'CLOCK POSITION (RT SIDE) ON THE NR 3 ENGINE. THE CRACK IS APPROX 2.5" LONG AND IS 1" FROM AFT SIDE OF EXHAUST SLEEVE JUST IN FRONT OF NAC STA 361.923. IAW SRM 54-41-30 THE DISTANCE BETWEEN THE CRACK AND THE EDGE IS OUT OF LIMITS. STOP DRILLED THE ENDS OF CRACK WITH A 0.125" DIAMETER HOLE.

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