Flap Motor, Transmission And Actuator Assembly Removal/Installation; Flap Control Lever Removal And Installation; Drive Pulleys Removal And Installation - Cessna 177 SERIES Service Manual

7-4.
TROUBLE SHOOTING (Cont).
TROUBLE
PROBABLE CAUSE REMEDY
FLAPS FAIL TO RETRACT. Defective, loose or improperly
Adjust and secure switch.
adjusted aft operating switch.
Replace if defective.
FLAP MOTOR CONTINU-
Microswitches improperly ad-
Rig per paragraph 7-21.
OUSLY FREEWHEELS.
justed.
FLAP POSITION INDICATOR Follow-up control slipping,
Connect and secure control.
FAILS TO RESPOND OR broken or disconnected.
Replace if defective.
READINGS ERRONEOUS.
Pointer bent or broken.
Replace defective parts.
7-5.
FLAP MOTOR, TRANSMISSION AND ACTU-
7-8. FLAP CONTROL LEVER.
ATOR ASSEMBLY.
7-9. REMOVAL AND INSTALLATION.
(Refer to
7-6.
REMOVAL AND INSTALLATION.
figure 7-1.)
a.
Place master switch in the ON position, run flaps
a. Disconnect battery cables and insulate terminals
to the full DOWN position then place master switch in as a safety precaution.
the OFF position.
b.
Remove follow-up control (19) from switch mount-
b.
Remove aft baggage compartment wall, discon-
ing arm (24).
nect battery cables from battery and insulate termi- c.
Remove flap operating switches (26 and 28) from
nals as a safety precaution.
switch mounting arm (24). It is not necessary to dis-
c.
Remove access plates from below actuator as-
connect electrical wiring at switches.
sembly.
d. Remove knob (29) from control lever (21).
d.
(Refer to figure 7-1.) Remove headliner access e. Remove remaining items by removing attaching
cover, remove safety wire and relieve cable tension
bolt. Use care not to drop parts into tunnel area.
at turnbuckles (12 and 12A).
f.
Reverse the preceding steps for reinstallation.
e. (Refer to figure 7-2.) Disconnect direct cables
Do not overtighten attaching bolt causing lever (21) to
(3) from actuator guide assembly (7).
bind. Rig system in accordance with paragraph 7-21.
f.
Remove bolt (14) securing follow-up control lever
(11) to actuator guide assembly (7).
7-10. DRIVE PULLEYS.
g.
Remove screws securing lower support (22) to
brackets (16 and 21).
7-11. REMOVAL AND INSTALLATION.
(Refer to
h.
Remove bolt (6) securing motor and transmis- figure 7-1.)
sion assembly to bracket (21). Move lower support
a. Run flaps to full DOWN position.
(22) and motor and transmission assembly outboard
b.
Remove headliner access cover, remove safety
to allow access to upper support screws,
wire and relieve cable tension at turnbuckles (12 and
i.
Remove screws securing upper support (2) to
12A).
brackets (16 and 21).
Place switches (17 and 18) c.
Remove access plates adjacent to drive pulley
and all attaching hardware out of the working area. (2).
j.
Slide the lower support (22) out of grommet in
d.
Remove bolt securing flap push-pull rod (9) to
the actuator guide assembly (7) and remove support
drive pulley (2).
from the wing.
e.
Remove bolt securing synchronizing push-pull
k. Disconnect electrical quick-disconnect (15).
tube (1) to drive pulley (2).
1.
Using care, remove motor (1), transmission (4),
f.
Remove cable guards (6).
actuator guide assembly (7) and upper support (2)
g. Remove cable lock pins (7) and disconnect
from wing through access opening as a unit.
cables (8 and 10) from drive pulley. Tag cables
m. Reverse the preceding steps for reinstallation.
for reference on reinstallation.
Rig system in accordance with paragraph 7-21, safety
h. Remove pivot bolt (5) attaching drive pulley to
turnbuckles and reinstall all items removed for ac- wing structure.
cess.
i.
Remove drive pulley (2) through access opening,
using care not to drop bushing (4).
Retain brass
7-7. REPAIR.
Repair consists of replacement of
washer between drive pulley and support bracket.
motor, transmission or coupling.
For lubrication
Tape open ends of pulley to protect bearings (3).
requirements refer to Section 2.
Change 5 7-3