Service difficulty report · Cylinder

Difficulty date
March 11, 2005
Submitted
April 1, 2005
Operation
General aviation
Propeller
Hartzl HCB4TN5
Part
Cylinder
Condition
Leaking
Location
Propeller
Component
Propeller · Hartzl
Component part number
HCB4TN5GL
Stage of operation
IN
How discovered
V
Nature of condition
W, 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) PROP WAS IN FOR BETA LIGHT FLICKERING, TORQUE FLUC, OIL PRESS FLUC. PROP HAD A SLOW PITCH CHANGE, OIL LEAK BETWEEN BASE OF CYL & HUB, GREASE LEAKAGE FROM ALL FOUR BLADE CLAMPS. FOUND NR 4 BLADE OUT 0.6 DEG IN ANGLE. LATCH ANGLES OUT ABOUT 0.7 DEGREES. PROP BEING DISASSEMBLED, FOUND PISTON NUT, INSIDE, OUTSIDE BLADE CLAMP BOLTS WERE NOT TO REQUIRED TORQUE. OUTER CLAMP BOLTS FOUND AT 40 TO 50 FT-LBS TORQUE, WHEN 65 FT-LBS IS SPEC. IT WAS FOUND THAT OD OF BLADE SHANK HAD ALSO BEEN PAINTED. NO ALIGNMENT TAPE FOUND ON BLADE SHANKS AND CLAMPS TO DETERMINE IF BLADES HAD SLIPPED IN CLAMPS. COULD HAVE BEEN CAUSE FOR BLADE ANGLES TO BE OUT OF SPECS. JOINT BETWEEN CYL AND HUB WAS FOUND TO BE LEAKING OIL.