Cessna 177 SERIES Service Manual

15-62.
STALL
WARNING
SYSTEM.
(Refer
to figure
miles
per
hour.
To test
horn
operation,
cover
15-6.)
opening
in
plate
(5)
with
a clean
cloth,
such
as
a
handkerchief
and
apply
a
slight
suction
by
mouth
to
15-63.
DESCRIPTION.
The
system
is composed
of
draw
air
through
horn.
an
adjustable
plate
on
left
wing
leading
edge,
con-
nected
to
a reed
type
horn
by means
of
plastic
tubing.
15-64.
TURN
COORDINATOR.
The
horn
is
actuated
approximately
5
to 10
miles
per
hour
above
stalling
speed
as a
negative
air
pressure
15-65.
DESCRIPTION.
The
turn
coordinator
is an
area
at
wing
leading
edge
causes
a
reverse
flow
of
electrically
operated,
gyroscopic,
roll-rate
turn
air
through
horn.
By
moving
adjustable
plate
(5)
up,
indicator.
Its
gyro
simultaneously
senses
rate
of
actuation
of
horn
will
occur
at a
higher
speed
and
motion
roll
and
yaw
axes
which
is
projected
on
a
moving
plate
down
causes
actuation
to
occur
at
a
single
indicator.
The
gyro
is
a non-tumbling
type
re-
slower
speed.
Center
adjustable
plate
opening
in
quiring
no
caging
mechanism
and
incorporates
an
wing
leading
edge
upon
installation,
then
flight
test
a. c.
brushless
spin
motor
with
a solid
state
inver-
aircraft,
observing
horn
actuation
during
stall.
Re-
ter.
adjust
plate
to
obtain
desired
results
if
necessary.
Approximately
3/32
inch
adjustment
of
plate
will
change
speed
at which
horn
actuation
occurs
by
5
15-66.
TROUBLE
SHOOTING.
TROUBLE
PROBABLE
CAUSE
REMEDY
INDICATOR
DOES
NOT
Friction
caused
by
contamination
Replace
instrument.
RETURN
TO
CENTER.
in the
indicator
damping.
Friction
in
gimbal
assembly.
Replace
instrument.
DOES
NOT
INDICATE
A
Low
voltage.
Measure
voltage
at
instrument.
STANDARD
RATE
TURN
Correct
voltage.
(TOO
SLOW).
Inverter
frequency
changed.
Replace
instrument.
NOISY
MOTOR.
Faulty
bearings.
Replace
instrument.
ROTOR
DOES
NOT
START.
Faulty
electrical
connection.
Check
continuity
and
voltage.
Correct
voltage
or replace
faulty
wire.
Inverter
malfunctioning.
Replace
instrument.
Motor
shorted.
Replace
instrument.
Bearings
frozen.
Replace
instrument.
IN COLD
TEMPERATURES,
Oil
in indicator
becomes
Replace
instrument.
HAND
FAILS
TO
RESPOND
too
thick.
OR IS
SLUGGISH.
Insufficient
bearing
end
play.
Replace
instrument.
Low
voltage.
Check
voltage
at instrument.
Correct
voltage.
NOISY
GYRO.
High
voltage.
Check
voltage
to
instrument.
Correct
voltage.
Loose
or
defective
rotor
Replace
instrument.
bearings.
15-24
Change
6

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)