Cessna 177 SERIES Service Manual

on the wing
in the area of the
bay is an indication
of
each sealant.
The sealants can
be identified by
color.
the intensity
of
the leak.
Fuel
leak classifications
The bay
sealant
is white
and its
accelerator
is a
are shown
in figure
12-4.
black
paste. The
access
door sealant
is gray
and its
accelerator
is a
clear liquid.
NOTE
WARNING
Stains
and
seeps
that
are
not considered
a
flight
hazard must
be inspected
after each
The accelerator,
EC-1608B
contains
cumene
flight to insure
that they have not grown
in
hydroperoxide. Keep
away from heat and
intensity to the point
of causing a flight
flame.
Use only in a well
ventilated area.
hazard.
Avoid
skin and eye contact.
WEAR EYE
SHIELDS. In case
of eye contact, flush
with
If a leak
causing a flight hazard should occur at
a copious amounts of water and
get prompt
place where
there are
no facilities
available
to
medical
attention.
make an
acceptable
repair,
it is recommended
that
the leaking
bay be drained
and some suitable
ma-
12-15. MIXING
SEALANT.
Use all the accelerator
terial placed over
the leak, if
it is within an
en- and
sealant in the
container when
mixing, to insure
closed area
of the wing,
to eliminate escaping
of
the proper
ratio of accelerator
to sealant.
Stir the
fumes.
By
switching
the fuel
selector
valve to
the
accelerator
to absorb
all
floating
liquid before
it is
other
bay, the
aircraft
can then
be flown
to a base
mixed with
the sealant.
The
accelerator
can then
be
where
the fuel
leak can
be repaired.
poured
into
the container
of sealant
for mixing;
other-
wise, a wax-free
container
must
be used. Stir
accel-
12-13. FUEL
BAY
PURGING.
erator
and sealant
until it
becomes
a uniform
mixture.
Do not
allow
air bubbles
to mix
in. If
this occurs,
WARNING
work
air bubbles
out.
To reduce the
possibility of an
explosion
12-16.
SEALING DURING
AND AFTER
STRUCTURAL
while repairing
integral
fuel bays which
REPAIR.
have been
fueled, the bay
may be purged
with
an inert
gas.
CATN
The following procedure may be
used to purge the Protect drain
holes and fuel outlet screens
bay with
argon or
carbon dioxide.
when applying
sealants.
a.
Ground
the aircraft
to
a suitable
ground
stake.
b.
Remove safety wire from
shut-off valve control
Any repair that
breaks the fuel bay
seal will neces-
knob and
pull control to "OFF"
position. (Resafety
sitate resealing of
that area of the bay. Repair
parts
control knob after completion
of repair.) that need sealing
must be installed and riveted during
c.
Drain all fuel
from bay being
repaired. (Observe
the sealing
operation.
All joints within
the boundary
the precautions in paragraph 12-3.) of the bay, but which do not provide a direct fuel path
d. Remove access door
and insert hose into
bay. out of the
bay, such as stringers
and rib flanges with-
e. Allow inert gas to flow into bay
for several min- in the bay, must be
fay surface sealed only. Joints
utes (time
dependent upon
hose size, rate
of flow,
which provide
a direct fuel path
out of the bay
area,
etc. ) to remove
all fuel vapors,
such as fuel spar flanges
and inboard and outboard
rib flanges,
must
be fay surface
sealed
and fillet
Since argon or carbon
dioxide are heavier than
air, sealed
on the fuel side. Fay surface
sealing is ap-
these gases
will remain in the bay
during the repair.
plying sealant to one
mating part before assembly.
The repair shall be made using non-sparking
tools Enough sealant must
be applied so it will squeeze out
(air motors, plastic scrapers, etc.)
completely around the joint when
the parts are rivet-
ed or fastened
together.
The
fillet
seal is
applied
NOTE
after the joint is fay surface sealed
and riveted or
fastened
together.
Fillet
sealing is
applying sealant
Portable vapor detectors are available
to to the edge of all riveted
joints, joggles, bend reliefs,
determine presence of explosive mixtures voids, rivets or fasteners through the boundary of the
and are calibrated for leaded fuel. These bay and any place that could produce a fuel leak. The
detectors can be used to determine when fay sealant need not be cured before the fillet seal is
it is safe to make repairs. applied, but the squeezed out sealant, to which the
fillet sealant
is
applied,
must
be free
of dirt
and con-
12-14. INTEGRAL
FUEL BAY SEALANT. Two kinds tamination.
Fillets laid on intersecting joints shall
be
of sealants are
used, one to seal the
fuel bay and the
joined together to produce
a continuous fillet.
Filler
other to seal the
access doors and fuel quantity
trans- sealant
must be pressed into
the joint, working out
mitter adapter. The
access door sealant is
more all entrapped
air. The best method
of applying seal-
pliable
and will not adhere
to metal as firmly as
the ant is with an
extrusion gun. Then work
the sealant
bay sealant
does. This
permits the
access doors and
into the
joint with a small
paddle, being
careful to
fuel
quantity
transmitter
adapter
to be removed
with-
eliminate
all air
bubbles.
out
damage
to them.
Service
Kit
SK210-56,
available
NOTE
from
the Cessna
Service
Parts
Center,
contains
these
sealants
with
the
proper
quantity
of accelerator
for
During
structural
repair,
parts
must
be pre-
12-8
Change
1

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)