Cessna 177 SERIES Service Manual

NOTE
9-7D. TRIM TAB
FREE-PLAY INSPECTION.
a. Place stabilator and trim tab in the neutral posi-
Relative
linear movement between
internal
tion.
threaded screw
(5) and bearing (9) should b. Using
moderate pressure, move the trim tab
be
0.004 to 0.010 inch at
room temperature.
trailing edge up
and down by hand to check
free-play.
c. A maximum of .137" (total motion up and down)
e. Examine
threaded rod
end (10) and
screw (5)
measured at
the trim tab trailing
edge is permissible.
for damaged
threads or dirt particles
that may
d. If the trim tab
free-play is less than
.137", the
impair smooth
operation.
system is
within prescribed limits.
f. Check
sprocket (1) for
broken, chipped
and/or
e. If the trim
tab free-play
is more than
.137",
worn
teeth.
check the following
items for looseness
while moving
g. Check
bearing (11)
for smoothness
of operation.
the trim
tab up and
down.
h. DO
NOT attempt
to repair
damaged
or worn
1. Check push-pull
tube
(24) to trim
tab horn
parts of the
actuator assembly.
Discard
all defective
assembly
attachment
for looseness.
items
and install
new parts
during reassembly.
2. Check
push-pull
tube (24) to
bellcrank assem-
bly (23) attachment for looseness.
9-7C.
REASSEMBLY.
(Refer to figure
9-3.)
3. Check
bellcrank
assembly
(23) to actuator
a. Always
discard
the
following
items
and install
assembly
(21)
attachment
for
looseness.
new parts
during reassemby.
4.
Check actuator
assembly
threaded
rod end
1.
Groov Pins (4 and 6)
for looseness
in the actuator assembly
(21).
2. O-Ring
(8)
f. If looseness is apparent
while checking
steps
b.
During reassembly,
lubricate collars (3),
screw e-1 thru
e-3, repair by installing
new parts.
(5) and threaded
rod end
(10) in accordance
with
g. If looseness
is apparent
while checking
step
Section
2.
e-4,
refer to paragraphs
9-6 through
9-7C.
c. Slip collar (3) and bearing (2) on screw (5),
d. Press
sprocket (1)
into the end
of screw
(5),
9-8. TRIM
TAB CONTROL
WHEEL.
(Refer
to fig-
align groov
pin holes
and
install new
groov pins
(4).
ure 9-1.
)
e. Insert screw
(5), with assembled
parts, into
housing
(7) until
bearing (2) is
flush with the
end of
9-9. REMOVAL
AND INSTALLATION.
housing.
a. Relieve
cable
tension at
turnbuckles
(10).
NOTE CAUTION
When inserting screw
(5) into housing (7),
Position a support stand
under tailskid
locatethe sprocket (1) at the end of housing assembly to prevent tailcone from drop-
which
is closer to
the grooves
for retaining
ping whle
working
insde
rings (12).
b. Remove
pedestal cover as
outlined in paragraph
*New bearings (2 and
9) are not pre-drilled
10-20.
and must be drilled on assembly. The groov c. Removdestal screws ecure. Logwer trim wheel (4) and
pins
(6) are 1/16 inch in diameter, there-
(7) to pedestal structure. Lower
trim wheel (4) and
fore,
requiring
a 1/16 (0.
0625) inch
drill.
brackets
to remove
chain (6)
f. With bearing (2) flush with end of housing (7), NOTE
carefully
drill bearing
so the drill will
emerge from
Trim
wheel (4) may be
removed from
brackets
ENLARGE
HOLES
IN
HOUSING.
by driving
out
roll
pin (1)
in
sprocket
(2) and
ENLAg.
Press new
groov pins
(6) into pin
holes
removing
cotter pin
on opposite
end of shaft.
g. Press new groov pins (6) into pin holes. This procedure is recommended for parts
h. Insert collar (3), new O-ring (8) and bearings procedre
(9) into opposite end of housing (7). replacement only.
i.
Complete
steps "f"
and
"g" for
bearing
(9).
j. If a new bearing (11) is required, a new bearing d Reverse preceding steps for reinstallation.
may be pressed into the boss. Be sure force bears Rig system in accordance with paragraph 9-12,
against
the outer race
of bearing.
safety
turnbuckles and
reinstall all items
removed
k. Screw the
threaded rod
end (10) into screw
(5).
for access.
1.
Slide actuator
bracket
(index
20. figure
9-1)ABLES
PULLEYS
onto housing (7) and install retaining rings (12).
m. Test
actuator
assembly
by rotating
sprocket
(1)
with fingers while holding
threaded rod end (10).
9-11. RE
The threaded
rod end should travel
in and out smooth-
a. FORWARD CABLE.
(Refer to figure
9-1.)
ly, with no
indication
of binding.
1. Peel
back carpeting
as necessary
to
expose
n. Reinstall
actuator assembly in
accordance with
access plates in cabn
and baggage areas
and remove
paragraph
9-7.
plates
and rear baggage
compartment
wall.
2. Remove safety wire, relieve cable tension
and disconnect forward cable ends from turnbuckles
(10).
Change
3
9-5

Cessna 177 SERIES Specifications

General

Manufacturer	Cessna
Engine Type	Piston
Wingspan	35 ft 6 in (10.82 m)
Seating Capacity	4
Number Built	4, 295
Engine	Lycoming O-360
Horsepower	180 hp
Maximum Takeoff Weight	2, 500 lb (1, 134 kg)