Cessna 177 SERIES Service Manual

NOTE
vent line
being
checked,
and check
that both
fuel
filler caps are securely installed.
Throughout
the aircraft
fuel system.
from the
d. Blow
into tube to
slightly pressurize
the fuel
fuel bays
to the carburetor,
use
RAS-4 (Snap-
bay. if
air can be blown
into fuel
bay, the
vent line
On Tools
Corp.,
Kenosha.
Wisconsin),
NEIL-
is
open.
T-5544 (Thread
Compound,
Antiseize, Graph-
e.
After fuel bay
is slightly pressurized,
insert
ite-Petrolatum)
or equivalent,
as a thread
end of rubber tube into
a container of water
and watch
lubricant or
to seal a leaking
connection.
Ap-
for a continuous
stream of bubbles,
which indicates
ply
sparingly to
male fittings
only, omitting
the bleed
hole in
valve assembly
is open
and relieving
the first two
threads. Always
ensure
that a
pressure.
compound.
the residue
from a previously
used
f. Repeat
this procedure
for fuel vent at
opposite
compound,
or
any other
foreign
material
can-
wing
tip.
not enter the system. NOTE
12-5.
FUEL VENTS.
A plugged
vent line or bleed hole
can cause
either fuel starvation or the pressurization
12-6. DESCRIPTION.
Thru Serial
17701633, a fuel
of the bay by fuel
expansion. Therefore,
bay vent line
extends
from the upper
aft corner
of each
any
fuel vent
found plugged
or restricted
fuel bay to
the wing tip.
This vent line contains
a
must be
corrected before
returning aircraft
check
valve. located
just
outboard of
each fuel
bay,
to service.
to prevent
fuel drainage,
but still
allow the positive
pressure
from expanding
fuel to escape
from the bays.
CAUTION
A reservoir tank vent
line is connected to
the right
fuel bay
vent line, and
contains
a drain tee.
located
Be
sure to uncover
drilled
holes in
vent lines
inboard
and forward
of the
right forward
door post.
at wing
tips after
completion
of check.
Removal and installation
procedures for
vent lines on
aircraft
thru Serial
17701633
are outlined
in para-
(SERIALS
17701634 THRU
17702526.
)
graph
12-8. Beginning
with Serial 17701634.
a fuel
a. Cover
.040 drilled
holes approximately
6 inches
bay vent line
extends from
the upper aft corner
of
from end of vent
lines at trailing
edges of wing
tips.
each fuel bay
to the opposite
wing tip. This
vent line
b. Turn fuel selector
valve to
opposite bay from
contains a drain
plug, located
in the wing
gap area of
vent line being
checked, and
remove both fuel
filler
each wing.
A reservoir
tank vent
line is connected
to caps.
the right fuel bay
vent line, and
contains a drain
tee c.
Using rubber
tube attached to
vent line at trailing
located inboard
and forward
of the right forward
door
edge of wing tip,
blow into line.
If air can be
freely
post. In
addition beginning
with serial
17702527 a
blown
into fuel bay,
vent line is
open.
vent line interconnect
is added to
the existing vent
lines in the upper cabin roof
area. Refer to Figure
NOTE
12-2B. Removal
and installation
procedures for vent
lines
on aircraft
beginning
with serial
17701634
are
This
procedure
does NOT
ensure
that
outlined in paragraphs
12-8A
thru 12-81.
vented-type
fuel bay
cap vents are
un-
obstructed. Refer to Paragraph 12-8J.
12-7. CHECKING
VENTS. Field experience
has
demonstrated
that the vents can become
plugged,
d. Repeat this procedure
for fuel vent in opposite
causing possible
fuel
starvation
of the
engine.
On
wing tip.
aircraft thru Serial
17701633, the bleed
hole in the
vent valve assembly could
possibly become plugged,
CAUTION
allowing pressure from expanding fuel to pressurize
the bay areas.
The following procedures
may be used
Be sure to
uncover .040 inch holes
in
to check
the vent systems for
proper operation,
vent lines
at wing tips after
completion
(THRU SERIAL 17701633) of check.
a. Cover . 040 drilled holes approximately 6 inches
from
end of vent lines
at trailing edges of wing
tips. (BEGINNING
WITH SERIAL
17702527.)
b. Attach a rubber hose
to the end of vent line at a. Cover
. 040 inch drilled holes approximately 6
trailing edge of
one wing tip.
inches
from end of vent
lines at trailing edges
of
c. Turn fuel selector
valve to opposite bay
from wing tips.
SHOP NOTES:
Change
7
12-3

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)