SDR 96ZZZX4829

Service difficulty report · Labyrinth Seal

Difficulty date
February 2, 1996
Submitted
March 26, 2000
Operation
General aviation
Engine
Allsn 250C20B
Part
Labyrinth Seal
Part number
6877736
Condition
Fractured
Location
Gp Turbine
Component
6898735
Stage of operation
IN
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

TURBINE WAS REMOVED DUE TO RUB. UPON DISASSEMBLY, FOUND THE GP STATOR SEAL HAD FRACTURED AT THE FORWARD END OF THE BEARING BORE. THIS TURBINE HAD THE NEW NR 8 BEARING AND RETAINING PLATE INCORPORATED PER CEB 1326. CAUSE OF FAILURE UNKNOWN.