Service difficulty report · Exhaust Stack · Boeing 74747UF

Difficulty date
March 4, 2013
Submitted
March 5, 2013
Operation
Air carrier
Aircraft
N476MC
Make and model
Boeing 74747UF
Aircraft serial
29256
Aircraft time
60,343 hours, 10,410 cycles
Engine
Ge CF66D
Part
Exhaust Stack
Condition
Cracked
Location
Nr 3
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

DURING MX WALK AROUND, FOUND A CRACK ON ENGINE NR 3 PRIMARY EXHAUST NOZZLE LOCATED AT 9 O'CLOCK POSITION AFT EDGE. THE CRACK DIMENSION RUNS 4.7500" LONG CIRCUMFERENTIAL AND LOCATED .7500" FROM THE NOZZLE AFT END. THE CRACK IS DETERMINED TO BE OUTSIDE ALLOWABLE LIMITS IAW SRM 54-41-30. DISPOSITION IS TO PERFORM TIME LIMITED REPAIR BY STOP DRILLING THE CRACK ENDS WITH A 0.125" DIAMETER HOLE, DVI EVERY 3 FLIGHT CYCLES; AND REMOVAL OF THE PART WITHIN 50 FC (FLIGHT CYCLES).

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