Blade Track; Propeller Controlling; Propeller Governor Removal; Propeller Governor Installation - Piper PA-44-180 SEMINOLE Maintenance Manual

BLADE TRACK.

Blade track is the ability of one blade tip to follow the other, while rotating, in almost the same plane.
Excessive difference in blade track - more than .0625 inch - may be an indication of bent blades or improper
propeller installation. Check blade track as follows:
1. With the engine shut down and blades vertical, secure to the aircraft a smooth board just under the tip
of the lower blade. Move the tip fore and aft through its full "blade-shake" travel, making small marks
with a pencil at each position. Then center the tip between these marks and scribe a line on the board
for the full width of the tip.
2. Carefully rotate propeller by hand to bring the opposite blade down. Center the tip and scribe a pencil
line as before and check that lines are not separated more than .0625 inch.
3. Propellers having excess blade track should be removed and inspected for bent blades. Constant speed
propellers should be checked for parts of sheared "O" ring, or foreign particles, which have lodged
between hub and crankshaft mounting faces. Bent blades will require repair and overhaul of assembly.
CONTROLLING.
PROPELLER GOVERNOR.
REMOVAL OF PROPELLER GOVERNOR.
1. Remove the upper engine cowl.
2. Disconnect the
A. Control cable end from the governor control arm. (S/n's 44-7995001 thru 44-8195026 and 44-
8107001 and up.)
B. Control rod rod end bearing from the governor control arm. (S/n's 4495001 and up)
Have a means available to catch oil that will drip from governor
when the oil line is disconnected.
3. Disconnect the governor oil line from the governor. (S/n's 4495001 and up)
4. Remove the governor mounting stud nuts. It will be necessary to raise the governor as the nuts are
being removed before the nuts can be completely removed.
5. Remove the mounting gasket. If another unit not substituted, and the governor is to be removed for a
considerable length of time cover, the mounting pad to prevent foreign matter.damage.
INSTALLATION OF PROPELLER GOVERNOR.
1. Clean the mounting pad thoroughly. Ensure that there are no foreign particles in the recess around the
drive shaft.
2. Place the governor mounting gasket in position with the raised portion of the screen facing away from
the engine.
3. Align the splines on the governor shaft with the engine drive and slide the governor into position.
4. With the governor in position, raise the governor enough to install washers and start mounting nuts.
Torque nuts 110 to 150 inch-pounds.
5. Connect the:
A. control cable end to the governor control arm. The ball stud is installed in the inner hole of the
control arm. (S/n's 44-7995001 thru 44-8195026 and 44-8107001 and up.)
B. Control rod rod end bearing to the governor control arm. (S/n's 4495001 and up)
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— NOTE —
3D6
61-21-00
Page 61-04
Revised: June 20, 1995