Service difficulty report · Gearshaft

Difficulty date
March 19, 1998
Submitted
March 26, 2000
Operation
General aviation
Engine
Allsn 250C20
Part
Gearshaft
Part number
6889701
Condition
Cracked
Location
Torquemeter
Stage of operation
CR
Nature of condition
J
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) SEVERAL CRACKS ORIGINATING FROM THE INNER SHOULDER AREA WORN TO APPROXIMATELY HALF THE THICKNESS FROM CONTACT WITH TORQUEMETER PISTON THRUST BEARING. THESE CRACKS RUN RADIALLY, THEN INTO THE THIRTY TOOTH GEAR, THEN AXIALLY FULL LENGTH OF THE GEAR. THE WEB PORTION BETWEEN THE 30 AND 83 TOOTH EXHIBIT CRACKS BRANCHING BUT NOT EXTENDING INTO THE 83 TOOTH GEAR.