Service difficulty report · Combustion Liner · Bell 407

Difficulty date
February 25, 2010
Submitted
March 5, 2010
Operation
Air carrier
Aircraft
N70AP
Make and model
Bell 407
Aircraft serial
53409
Aircraft time
6,511 hours, 6,294 cycles
Engine
Allsn 250C47B
Engine time
6,493 hours, 5,132 cycles
Part
Combustion Liner
Part number
23064570
Part serial
656
Condition
Cracked
Location
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

ON 08/28/2009, TURBINE ASSY PN 23063354 SN CAT-44643 WAS REMOVED FOR O/H AND LIFE LIMIT ON THE WHEELS AND A LOANER WAS INSTALLED WITH A REPAIRED COMBUSTION LINER. ON FEB 25, 2010 UPON INSTALLATION OF THE ORIGINAL O/H TURBINE ASSY, IT WAS FOUND THAT THE REPAIRED COMBUSTION LINER PN 23064570 SN 656 HAD DEVELOPED A CRACK 3/4" AND 3 OUT OF 5 FLANGE SEGMENTS HAD BROKEN OFF OF WHICH 2 WERE BENT OVER THE TURBINE STATOR VANES AND THE THIRD REMAINS MISSING. IT IS BELIEVED TO BE INSIDE THE RENTAL TURBINE ASSY. THE COMBUSTION LINER HAS 305 HRS AND 301 CYC.

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