Trim Tab Control Wheel - Cessna 150 STANDARD Service Manual

9-8. TRIM TAB CONTROL WHEEL. (Refer to fig-
ure 9-1.)
9-9. REMOVAL AND INSTALLATION.
a. Relieve cable tension at turnbuckle (15).
iCAUTION\
Position a support stand under tail tie-down
ring to prevent tail cone from dropping while
working inside.
b. Disengage chain from sprocket (5).
c. Remove cotter pin at each end of trim wheel
shaft.
d. Slide shaft assembly into either bearing (2) as
far as possible.
e. Carefully deform brackets (1) and slide shaft
assembly free of bearings (2).
f. Reverse preceding steps for installation. Rig
system in accordance with applicable paragraph in
this section, safety turnbuckle and reinstall all items
removed for access.
9-10. CABLES AND PULLEYS. (Refer to figure
9-1. )
9-11. REMOVAL AND INSTALLATION.
a. Remove seats, upholstery and access plates as
necessary.
b. Disconnect cables at turnbuckle (15) and cleviS
(14).
c. Remove fairlead, cable guards and pulleys as
necessary to work cables free of aircraft.
NOTE
To ease routing of cables, a length of wire
may be attached to end of cable before being
withdrawn from aircraft. Leave wire in
place, routed through structure, attach cable
being installed and pull cable into position.
d. After cable is routed in position, install pulleys
and cable guards. Ensure cable is pOSitioned in pul-
ley groove before installing guards.
e. Rig system in accordance with applicable
paragraph in this section, safety turnbuckle and re-
install all items removed in step "a. "
9-12. RIGGING. (Refer to figure 9-1.)
Position a support stand under tail tie -down
ring to prevent tailcone from dropping while
working inside.
a. Remove rear baggage compartment panel and
access plates as necessary.
b. Loosen travel stop blocks (16) on cables.
9-6 Change 3
c. Disconnect actuator (9) from push-pull tube
(12).
d. Check cable tension and readjust turnbuckle (15)
if necessary.
NOTE
If
chains and/or cables are being installed,
permit actuator screw to rotate freely as
chains and cables are connected. Set cable
tension.
e. Rotate trim wheel (3) full forward (nose down).
Ensure that indicator (7) does not restrict wheel move-I
ment.
If
necessary, reposition indicator using a thin
screwdriver to pry trailing leg of indicator out of
groove.
NOTE
Full forward (nose down) pOSition of trim
wheel is where further movement is pre-
vented by chain or cable ends contacting
sprockets or pulleys.
f. With elevator and trim tab both in neutral
(streamlined), place inclinometer on tab and set to
zero.
NOTE
An inclinometer for measuring control surface
travel is available from Cessna Service Parts
Center. Refer to figure 6-4.
g. Rotate actuator screw in or out as required to
place tab up with a maximum of 2° overtravel, with
actuator screw connected to push-pull tube (12).
h. Rotate trim wheel to pOSition tab up and down,
readjusting actuator screw as required to obtain
overtravel in both directions.
i.
Position stop blocks (16) and adjust as illustrated
in figure 9 -3 to limit travel to the degree specified
in Section 1.
j. Check that trim wheel indicator travels same dis-
tance from ends of slot in cover. Reposition trailing
leg of indicator if necessary (refer to step "e").
k. Safety turnbuckle and reinstall all items removed
in step "a".
IWARNING'
Be sure trim tab moves in correct direction
when operated by trim wheel. Nose down
trim corresponds to tab up position.