Cessna 177 SERIES Service Manual

b. BEGINNING
WI
T 1T702124.
TROUBLE PROBABLE CAUSE REMEDY
GAGE
DOES NOT
REGISTER
Pressure
line to transducer
Check
line for obstructions.
cloged. Clean line.
Pressare line broken.
Check for leak.
Replace.
No poer
to system.
Check circit
breaker. Reset.
Check wrig.
Replace.
Transducer open. Replace transducer.
GAGE
READS
INACCURATELY.
System
out
f calbro
Apply
100
p of
regulated
air
pressre
to transducer
and adust
Trimpot
to set
poater
atmu.
red
line
on
the gage.
Trimpot faulty. Pointer Replace cluster.
move erratically when
Trimpot is rotated.
15-38.
OIL TEMPERATURE GAGE.
supplied to the circuit board through the instrument
lights
circuit breaker. A single
wire connects the gage,
through
15-39.
DESCRIPTION. Thru
airplane serial 17702123
the circuit board,
to a transducer mounted
on the aft, right
and
when modified
by SK177-36,
the oil temperature
gage side
of the engine.
Airplanes
modified by
SK177-54 have
is a Bourdon
tube type pressure instrument
connected by
an electric gage and
sending unit and are not
adjustable.
armored
capillary tubing to a
temperature bulb in the
Refer to Table 1
on page 15-22A, when trouble
shooting the
engine. The
temperature bulb,
capillary tube
and gage are
oil temperature
gage.
filled
with fluid
and are sealed.
Expansion
and contraction
of fluid in the bulb
with temperature changes operates the 1.40.
CARBURETOR AI TEMPERATUR GAGE.
gage.
Checking capillary tube
for damage and fittings
for
security is the
only maintenance required.
Since the tubes 15-41.
DESCRIPTION.
The carburetorm r tempera-
inside
diameter
is small, small
dents and
kinks which
ture
gae is
of the resistance-bridge
type. Chaages
would
be acceptable
in larger tubing
may partially or
In electrical
resisance
of the element
are dicated
completely
close
off capillary,
making
gage
inoperative.
by the
gage,
calibrated
for
temperature.
The system
Beginning
with
airplane
serials 17702124.
and
when not
requires
power
from
the aircraft
electrical
system
modified
by
SK177-36
or SK177-54
an electrical
oil
and operates
only when
the
master
switch is
on. Al-
temperature
gage is installed.
The gage is mounted
on a
though both instrment
and sensin
bulb are grounded,
circuit board
which
comprises
the
back cover
of the
dual
two
leads are
used
to avoid
possibility
of
nstrmnent
gage
instrument
cluster.
The
gage is
electrically
connected
error induced
by poor
electrical
bonds
in the
air-
to
the
circuit
board
by
the
gage
mounting
screws.
Power
is
frame.
15-42.
TROUBLE SHOOTING.
TROUBLE
PROBABLE
CAUSE
REMEDY
GAGE POINTER STAYS Circuit breaker out. Check visually. Reset breaker.
OFF
LOW
END OF
SCALE. Master switch "OFF" or Check switch "ON." Replace
switch defective. defective switch.
Broken or grounded leads
Check circuit wiring.
Repair
between gage
and sensing
or
replace defective
wiring.
unit.
Defective gage
or sensing
Substitute
known-good
gage or
unit.
sensing unit.
Replace gage
or
sensing
unit.
GAGE POINTER GOES OFF
Broken or grounded lead. Check
circuit wiring. Repair or
HIGH END
OF SCALE.
replace
defective
wiring.
Change 8 15-15B

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)