Service difficulty report · Scroll · Bell 407

Difficulty date
May 19, 2012
Submitted
September 14, 2015
Operation
General aviation
Make and model
Bell 407
Aircraft time
6,713 hours
Engine
Allsn 250C47B
Part
Scroll
Part number
2306577
Condition
Cracked
Location
Compressor
Part time
4,408 hours
Component
Compressor Assy · Allsn
Component part number
23065593
Stage of operation
IN
How discovered
9
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

(CAN) 1" CRACK FOUND ON PRE-FLIGHT DAILY INSPECTION BY AME APPRENTICE ON LOWER LT SIDE OF COMPRESSOR SCROLL ADJACENT TO A WELD. HELICOPTER WAS GROUND RUN TO CONFIRM AND AIR WAS NOTED BLOWING FROM CRACKED AREA. COMPRESSOR ASSY WAS REMOVED FROM ENGINE AND SENT FOR REPAIR. THIS WAS A "THIN WALL" SCROLL AND WILL BE REPLACED WITH THE IMPROVED "THICK WALL" SCROLL. THIS IS THE THIRD CRACKED THIN WALL SCROLL WE HAVE HAD RECENTLY.

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