Service difficulty report · Combustion Case · Bell 407

Difficulty date
January 29, 2020
Submitted
January 29, 2020
Operation
Air carrier
Filed by
HEER617E
PHI Aviation, LLC
Aircraft
N452P
Make and model
Bell 407
Aircraft serial
53568
Aircraft time
6,686 hours
Engine
Allsn 250C47B
Engine time
5,089 hours
Part
Combustion Case
Part number
M25010404
Part serial
YL12270
Condition
Cracked
Location
Engine
Part time
1,100 hours
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

ENGINE REMOVED 12/31/2019 DUE TO SCHEDULE CHANGE FOR TURBINE OVERHAUL (WHEEL RETIREMENTS). FOUND OUTER COMBUSTION CASE CRACKED AROUND FUEL NOZZLE WELD. M250-C47 SERIES CEB A-72-6085 REV 3 ENGINE, COMBUSTION ASSEMBLY - INSPECTION OF OUTER COMBUSTION CASE P/N M250-10404 PREVIOUSLY COMPLIED WITH BULLETIN AT 15 HOURS PRIOR TO CRACK AT FUEL NOZZLE BORE. REPLACED COMBUSTION CASE WITH OVERHAULED PART.

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