Cessna 182 1978 - Fuel Quantity Transmitter; Fuel Vents

MODEL
182
& T182
SERIES
SERVICE
MANUAL
g.
Pinch
or
close
the
rubber
hose
to sustain
pres-
sure in the fuel bay. tube to retain pressure within the cell. Loosen. but
h. Apply a
soap solution to the fuel
filler caps and
do not remove filler cap
on opposite wing to
check
inspect
for leakage
around
the rubber
seal to
filler
cell
crossover
line. If
pressure
escapes
from filler
neck junction,
the fuel
cap vent.
and
the fuel
cap
cap,
crossover
line is open.
Remove
rubber tube
handle stem.
Load the cap
sideways in all
directions
from end of vent
line beneath
the wing after comple-
by
pressing on the
fuel cap vent
housing by hand.
tion
of check.
NOTE
NOTE
No leakage
is permissible.
If leaks are
Remember
that a plugged vent line
or bleed
present, replace the cap with a new unit hole can cause either fuel starvation or the
or
repair in
accordance
with Cessna
pressurization
of cells by
fuel expansion.
Service
Information
Letter
SE
80-59
Supplement
#1 dated
June
23 1980.-
f. Any
fuel vent
found
plugged or
restricted
must
be corrected prior
to returning aircraft
to service.
Care
must
be exercised
in
removing
the
fuel
filler caps
until the system
has been
The fuel vent
line protruding
beneath the
depressurized.
wing near
the wing
strut
must be
correctly
aligned
to avoid
possible
icing
of the
vent
i. After replacement
or repair
of either
fuel filler
tube. Dimensions
are
shown in figure
6.
cap,
repeat
the
inspection.
j.
Remove
the
rubber
hose,
unplug
or
remove
the
12-24A.
ADJUSTMENT.
On
aircraft
serials
182-
tape from
the
other fuel
vent,
and place
the fuel
66591
and
on, uneven
fuel
flow from
the
integral
fuel
selector
in the
desired
position.
bays,
when
the aircraft
fuel
selector
valve
is posi-
tioned
to feed
from
both
fuel
bays.
can
be caused
by
12-21.
FUEL QUANTITYTRANSMITTERS.
Refer
unequal
pressures
in the fuel
venting
system.
When
to
Section
15 for
a detailed
description,
operation,
uneven
fuel
flow
is observed,
the venting
system
may
and maintenance
procedure.
be
checked
and
unequal
pressures
in the
system
cor-
rected
by using
the
following
procedures:
12-22.
FUEL
VENTS.
NOTE
12-23.
DESCRIPTION.
A vent line
is installed
in
the outboard end
of each fuel bay and
extends over-
The following procedure
should be accom-
board through
the lower wing
skin. The inboard
end
plished during
a sequence
of routine flight
of the vent
line extends into the fuel
cell. then
operations.
Special flights for the
sole
bends
down and
inboard. A vent
valve is install-
purpose of
checking and
adjusting fuel
ed on the
inboard end of the
vent line inside the fuel
tank feed
rates are not recommended.
cell,
and a crossover
line connects
the
cells together.
On aircraft
equipped
with long-range
cells, a nylon
a. Inspect
the venting
system to insure
the lines
vent
tube is attached
to the crossover
line at the
in- are
open, connections
secure and
that the system
board
end of each cell.
This vent tube extends
into
is functioning properly.
the fuel cell,
and
is suspended
by four
hangers
in the
b. Park
the aircraft
on
level ground
and
select the
top of
the cell.
'both' position
on the fuel
selector. Leave
the air-
craft
parked
until
the tank
levels
are
equal
or
fill
12-24.
CHECKING.
Fuel
vents
can
become
plugged
both tanks.
as evidenced
by field
experience,
and
can cause
fuel
c. With
the fuel
selector
in the 'both'
position,
take
starvation
of the engine.
If the
bleed hole
in the
vent
off and
climb to
an altitude
where the
air is
smooth.
valve
becomes
plugged,
then
over
pressurization
can
d.
Trim the
aircraft
for straight
and level
flight.
occur
due to normal
temperature
variation.
This
Make
sure
the aircraft
is free
of any 'yaw'
by trim-
would usually
occur
then the airplane
engine
is not
ming the
rudder to center
the ball
of the turn
coordi-
operating.
The following procedure
should
be used
nator. Cruise
at the top of the
green band on
mani-
to check
the fuel vent
and bleed system.
fold
pressure for a
period of at least
one hour.
a. Attach a rubber
tube to the end of vent
line be- e.
At the end of the hour and
while still in straight
neath the wing.
and level flight,
take note of the fuel tank levels as
b.
Plug vent on opposite
wing from one
being tested.
indicated on the
fuel gauge.
c. Slightly pressurize
the cell,
if air can enter
the f.
If the fuel tank
levels are greater
than 5 gallons
cell, the vent line is open.
apart, land the aircraft
and perform the following
d. After
cell is slightly
pressurized,
insert end
of procedure:
rubber
tube into a
container
of water and
watch for
a
1. Bend the
underwing
vent of the
tank which
continuous
stream
of
bubbles,
which
indicates
the
had
the highest
level
outboard
1/4".
bleed
hole in
valve assembly
is open
and relieving
2.
Bend the
underwing
vent
of the
tank which
pressure.
had the lowest
level inboard
1/4",
providing
the vent
e.
After completion
of step
"c", blow
into tube
is not
squarely
behind the
strut.
Repeat the
first
again
to slightly pressurize
the cell.
Crimp rubber
five
steps.
12-16