Service difficulty report · Locking Bolt · Cessna 550

Difficulty date
November 14, 1996
Submitted
March 26, 2000
Operation
Air carrier
Make and model
Cessna 550
Engine
Pwa JT15D4
Part
Locking Bolt
Part number
310438901
Condition
Low Torque
Location
Lp Turbine
Part time
1,785 hours
Component
Pwa · 3024932
Stage of operation
IN
Nature of condition
K
Precautionary procedure
K

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

What was found

(CAN) DURING DISASSEMBLY FOR HSI ABOUT 1/4 CUP OF CARBON GRANUALS WERE REMOVED FROM THE LP TURBINE SHAFT INCLUDING A RING OF CARBON AROUND THE INTERSHAFT OIL TRANSFER TUBE. THE SECURING BOLT WAS UNSTAKED AND WHEN A SOCKET WAS APPLIED TO REMOVE THE BOLT, A TORQUE OF ABOUT ONLY 50 IN. LBS WAS REQUIRED. THE TORQUE ON THE PULLER TO REMOVE THE LP TURBINE BALANCE ASSEMBLY WAS ALSO VERY LOW. THIS IS THE FIRST TIME THIS ENGINE HAS BEEN OPENED.

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