Condition Lever Linkage; Propeller Rigging - Thrush Aircraft S2RHG-T65 TURBO THRUSH Maintenance Manual

THRUSH AIRCRAFT, INC – MODEL S2RHG-T65 TURBO THRUSH
until a piece of paper between the screw and the stop is held tightly and a further
motion in the REVERSE direction will release the paper.
L. Measure the angle of the cambox input lever (Fig. 4-3, #3).
M. Push the power lever (Fig. 4-3, #7) forward to the point where the stop screw is
about to lift-off of the stop, but will slightly still grip the piece of paper tightly.
N. Measure the cambox input angle. The difference between the two angle
measurements should be 11 to 12 degrees. Adjust the dead band stop screw
(Fig. 4-7) to obtain the desired dead band travel. One full turn out of the dead
band adjustment screw will widen the dead band 1.32 degrees.
O. Check that the dead band adjusting screw (Fig. 4-7) first contacts the stop at, or
slightly forward of the idle detent and the adjusting screw begins to lift-off the
stop at, or slightly aft of the ground idle detent.
P. The dead band travel can be repositioned by adjusting the serrated washer (Fig.
4-7) on the speed setting shaft. A movement of one serration will result in 0.6-
degree change in position of the FCU arm (Fig. 4-3, #10). Fine adjustments of
the dead band position may be made by adjusting the length of the interconnect
rod (Fig. 4-3, #6).
Q. Connect the push-pull cable (Fig. 4-3, #1) to the propeller cam Fig. 4-3, #2).
R. When rigging complete, check all cotter pins for correct installation, safety wiring
complete and all clevis ends, nuts, etc. are in safety.
With the condition lever placed in LOW-IDLE, install rig pin. This is the datum setting
point.
A. Place the condition control lever (Fig. 4-3, #8) in LOW-IDLE detent on cockpit
control quadrant.
B. Align cable terminal with 3
#5) and connect.
C. Operate the condition control lever (Fig. 4-3, #8) on the cockpit control quadrant
throughout its full range to ensure freedom of movement and check the following:
1. When OFF, the FCU cut-off stop (Fig. 4-7) is contacted and the pump off-
load set screw (Fig. 4-7) fully depresses the pump unloading valve plunger
(Fig. 4-7).
2. When control lever selected to LOW-IDLE, the FCU condition lever (Fig. 4-
3, #5) rig pin can be inserted and withdrawn freely.
3. When selected to HIGH-IDLE, the FCU reset lever contacts the HIGH-IDLE
stop (Ref. Fig. 4-7).
A. Move propeller control lever (Fig. 4-3, #9) fully forward and check that the skirt
below the propeller governor speed set lever (Fig. 4-2, #9) contacts the
maximum speed stop (Fig. 4-2, Item 10).
4-24
AIRCRAFT MAINTENANCE MANUAL

CONDITION LEVER LINKAGE

rd
hole from the top in FCU condition lever (Fig. 4-3,

PROPELLER RIGGING

Effective: 5/05/04