Cessna 182 1978 - Accelerated Curing Time; Normal Cure Time; Normal Work Time; Sealing Fuel Leaks

MODEL 182 & T182 SERIES SERVICE MANUAL
sealed, leaving a taper on the remaining sealant. 12-47. SEALING FUEL LEAKS. First determine
The taper will allow a scarf bond and a continuous the source of the fuel leak. Fuel can flow along a
seal when the new sealant is applied.
seam or structure of the wing
for several inches,
making the leak source difficult to find. A stained
area is
an indication of the leak
source. Fuel leaks
NOTE
can
be
found
by testing
the complete
bay
as described
in paragraph
12-49.
Another method
of detecting
the
The best
method
for removing
sealant
is
source
of a
fuel leak
is to remove
access
doors
and
with a chisel-type
tool made
of hard
blow with an air
nozzle from the
inside of the
bay in
fiber.
Remaining
sealant
is then
removed
the area
of the leak
while
soap bubble
solution
is
with aluminum
wool. Steel wool or sand- applied
to the outside of the bay. After the
leak
paper
must
not
be used.
source
has been
found,
proceed
as
follows:
a. Remove existing sealant in the area of the leak
b. Vacuum thoroughly
to remove all
chips, filings,
as described in
paragraph 12-46.
dirt,
etc.,
from
the bay
area.
b.
Clean
the
area
and apply
a fillet
seal.
Press
c. All
surfaces
and
areas
to be sealed
shall be
sealant
into leaking
area
with
a small
paddle,
working
thoroughly cleaned
by wiping with a clean cloth damp-
out all air bubbles.
ened with Methyl Ethyl Ketone (MEK), acetone or
similar solvent and dried with a clean
cloth before c. If leakage occurs
around a rivet or bolt, restrike
the
solvent
evaporates.
Always
pour
the
solvent
on
the rivet
or loosen
bolt,
retorque,
and
reseal
around
the cloth. Never use
contaminated solvent. The
nut plate.
the cloth. Never use contaminated solvent. The d. Apply fay surface door sealant to access doors,
cloth shall not be so saturated that dripping
occurs. fuel
fuel quantity
transmitters, etc.,
if removed, and
e.
Test fuel bay for leakage
as outlined in paragrap
12-49.
Work life of sealants included in kit SK210-56 12-49.
is two
hours. Work life of
sealant included in
12-48. NORMAL, CURE TIME. Service Kit SK210-56
kit SK210-101 is 1/2 (one-half) hour. These 12-48. NORMAL CURE TIME. Service Kit SK210-56
times are based on standard conditions of contained: (A) SP654706B2 access door sealant
77°F (25°C) and 50 percent relative humidity.
A temperature increase or a lower humidity level
will shorten the work life of the
d. Apply
fay surface sealant
to one mating part
and kits
are based on 77°F (25°C)
install rivets
or fasteners while
sealant is still with-
and 50 percent
relative humidity
in its
allowable
work life.
NOTE
12-48A. NORMAL
WORK TIME.
Normal work time
for Service Kit
SK210-56 is two hours,
and 0.5
During the sealing
operation,
sealant must
be
hour for Service
Kit SK210-101.
Shelf life
of
checked at
various times
to determine
that it
these kits is
approximately
six months. If
more
has not
exceeded its allowable
work
life. Use
rapid cure
times are desired,
refer to the
follow-
a small wood
paddle, such
as a tongue depres-
ing note and
accelerated curing
time chart.
sor, to gather some
sealant. Touch
the seal-
ant to a piece of clean sheet metal. If the NOTE
sealant
adheres to the sheet
metal, it is still
within its allowable work life. If the sealant Temperature shall not exceed 160°F (71°C).
does not adhere to the sheet metal, it is be- Bay must be vented to relieve pressure
yond its allowable work life and must not be during accelerated curing.
used.
e. Apply a fillet
seal to the repaired
area on the
ACCELERATED
CURING TIME
inside of the bay.
f. Apply
fay surface door
sealant to access
doors
F of Sealant
Time in
Hours
and fuel quantity
transmitter adapter, if
removed,
and install the doors and adapter. 140 4
g. Allow
the sealant
to cure. Refer
to paragraph
140
4
12-48 for
curing time.
130
5 1/2
h. Clean stains from
outside of bay area.
120 7
i.
Test fuel
bay for leaks
as described
in
paragraph
Applicable
to SK210-101
only.
12-49.
12-49.
Revision
1
12-27