Cessna 177 SERIES Service Manual

ment
panel lighting is controlled
by a dimming
rheo- 16-79.
CONTROL WHEEL
MAP LIGHT.
stat located
on the left side of
the instrument panel.
16-80. DESCRIPTION.
An optional
control wheel
16-70.
REMOVAL
AND INSTALLATION.
For
re-
map light
is
available
on
the 177
model.
The
map
moval
and installation
of instrument
panel lights,
light
is mounted on the
underside of
the control wheel
refer
to figuer
16-9.
and the
light intensity
is controlled
by a
thumb
oper-
ated
rheostat.
For dimming,
the
rheostat should
be
16-71. DOME LIGHT.
turned clockwise.
16-72. DESCRIPTION. The dome light is located in
the aft end of the overhead console and provides for CAUTION
cabin lighting. The
dome light consists of
a frosted
lens and a single bulb controlled
by a switch located Thru 1970 aircraft
only, failure to observe
in the center of the overhead console.
polarity shown on wiring
diagram (Section
20),
.will result
in immediate
failure
of the
16-73. REMOVAL AND
INSTALLATION. For re- transistor
on the map light circuit board
moval and installation
of dome light, refer to figure
assembly.
16-9.
16-81.
REMOVAL AND
INSTALLATION.
(Thru
16-74. COMPASS AND
RADIO DIAL LIGHTING. 1970
Aircraft Only) (See figure 16-11.)
a. For easy
access to the map
light assembly,
16-75. DESCRIPTION.
The compass
and radio dial
rotate the control
wheel 90'.
lights are contained
within the individual
units. The b.
Remove the four screws
from the map light cir-
compass light
is controlled by
the instrument
light cult
board. The map
light assembly
will then be
free
dimming rheostat
and the radio lights
are controlled
for removal from
the control wheel.
by the radio light dimming rheostat. Both rheostats c. Label the wires connecting to the map light cir-
are located on the left side of the panel, cuit board assembly and remove the screws securing
the wires
to the circuit board
assembly.
16-75A. TRANSISTORIZED
LIGHT DIMMING.
d.
To install the map light
assembly, reverse this
procedure.
16-75B. DESCRIPTION.
Beginning
with aircraft
serial 17702124 a remotely located
two-circuit 16-82. REMOVAL
AND INSTALLATION. (BEGIN-
transistorized dimming assembly is installed to NING WITH 1971) (See figure 16-11).
control aircraft lighting. One circuit controls the a. For easy access to the map light assembly ro-
eyebrow
lights, compass light and console
light, -tate the control
wheel 90
° .
also post lighting if installed. The other circuit b. Beginning with 1972 Models, remove terminal
controls engine instrument and radio lighting. The block cover.
dimming
assembly is located on
the inboard side of
c. Label the wires
connecting the map light
assem-
the glove box.
Two dimming rheostats
on the pilots
bly (terminal block) and
remove screws securing
the
switch panel control power
through the dimming wires
to the terminal block.
assembly. One rheostat
is for panel lighting and the d. Remove
screws securing map light to the control
other
for engine instrument
and radio lighting,
wheel
and remove map light
assembly.
e. For reassembly reverse this procedure.
16-75C. REMOVAL AND INSTALLATION. For re-
moval and
installation of the
dimming assembly
refer 16-83.
PITOT HEATER.
to figure 16-10A.
16-84. DESCRIPTION.
An electrical
heater unit is
16-76. COURTESY LIGHTING.
installed
in some pitot tubes. The
heater offsets the
possibility of ice formation on the pitot tube. The
16-77. DESCRIPTION.
A
courtesy light
is located
heater is integrally
mounted
in the pitot tube
and is
on the underside
of each wing and
in the lower
por- controlled
by the pitot
heat switch.
'See figure 16-12.)
tion
of the pedestal.
The switch
operating all
three
For Trouble
Shooting refer
to Section 15.
courtesy
lights is located
on
the left hand
doorpost.
16-78. REMOVAL
AND INSTALLATION.
For re-
moval and installation
of courtesy lights,
refer to
figure 16-10.
Change
6
16-27

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)