Cessna 177 SERIES Service Manual

15-52. FUEL
QUANTITY INDICATING
SYSTEM.
15-53B.
INSTALLATION.
15-53. DESCRIPTION. The magnetic
type fuel quantity
NOTE
indicators
are used in conjunction
with a float operated
variable-resistance
transmitter
in each tank. The
full Install
new gaskets on transmitter.
position of float produces
a minimum resistance
through
transmitter,
permitting maximum current flow through
a. Aircraft serial 17700001 thru 17702752
except
the fuel
quantity indicator, and
maximum pointer deflec-
aircraft incorporating
SEB85-2, position gasket
and nut
tion. As fuel level is lowered, resistance
in transmitter is ring assembly inside fuel
bay, place gasket on transmitter
increased,
producing a decreased current flow through
and insert transmitter through inside gasket
and nut ring.
fuel quantity indicator and a smaller pointer
deflection. b.Install bolts and washers
and tighten. Safety wire
bolts.
15-53A.
REMOVAL,
c. On aircraft
serials 17702753 and
on and 17700001
a. Remove
access plates on the
underside of wing for-
thru 17702752 incorporating
SEB85-2,
If nut ring
ward of the flap
bellcrank. assembly
was removed, seal nut ring assembly directly
to
b. Drain enough
fuel from bay to lower
fuel level below
fuel bay wall using CP890KT-82
Fuel Tank Sealant.
transmitter. (Observe
precautions in paragraph 12-3.)
d. Place gasket on transmitter and insert transmitter
c. Disconnect
electrical lead and ground
strap from
through inside gasket and
nut ring, and install screws.
transmitter.
Torque screws
to 20 in. Ibs., using a cross
pattern sequence.
d. Remove safety
wire from transmitter
attaching
e. Connect electrical
lead to transmitter.
bolts/screws.
e. Aircraft serial 17700001 thru 17702752
except
NOTE
aircraft
incorporating
SEB85-2,
remove
bolts and carefully
remove
transmitter, gaskets,
and nut ring assembly
from Ensure
that transmitter is grounded
per figure
fuel spar. DO NOT
BEND FLOAT
ARM.
15-6A.
f. On aircraft
serials 17702753
and on and 17700001
thru
17702752 incorporating
SEB85-2, Remove screws,
f. Service
fuel bay. Check for leaks
and correct fuel.
washers,
transmitter, and
gasket. DO NOT
BEND
quantity indication.
FLOAT
ARM.
15-54. TROUBLE SHOOTING--
FUEL QUANTITY INDICATING
SYSTEM.
TROUBLE
PROBABLE
CAUSE
REMEDY
FAILURE TO INDICATE.
No power to indicator or
trans- Check
fuse and inspect for open
mitter.
(Pointer stays below E.)
circuit. Replace fuse,
repair
or replace
defective
wire.
Grounded
wire. (Pointer stays
Check for partial ground
between
above F.)
transmitter
and gage. Repair or
replace defective
wire.
Low voltage.
Check voltage
at indicator.
Correct
voltage.
Defective
indicator.
Substitute
known-good
indicator.
Replace indicator.
OFF
CALIBRATION.
Defective indicator.
Substitute known-good
indicator.
Replace
indicator.
Defective
transmitter. Substitute
known-good transmitter.
Recalibrate
or replace.
Low or high
voltage.
Check voltage
at indicator.
Correct voltage.
STICKY
OR SLUGGISH
Defective indicator.
Substitute known-good
indicator.
INDICATOR
OPERATION.
Replace indicator.
Low voltage.
Check voltage at indicator.
Correct voltage.
ERRATIC
READINGS.
Loose or broken
wiring on
Inspect circuit
wiring.
indicator or transmitter.
Repair or replace
defective wire.
Defective indicator
or trans- Substitute
known-good component.
mitter
Replace indicator or transmitter.
Defective
master switch.
Replace
switch.
Change 8 15-21

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)