Mixing Sealant; Sealing During And After Structural Repair - Cessna T182 Series Service Manual

MODEL 182 & T182 SERIES SERVICE MANUAL
in the bay, must be fay surface sealed only.
Joints
The accelerators contain heavy metal peroxides.
which provide a direct fuel path out of the bay area,
Keep away from heat and flame. Use only in a such as fuel spar flanges and inboard and outboard
well-ventilated area. Avoid skin and eye contact. rib flanges, must be fay surface sealed and fillet
WEAR EYE SHIELDS. In case of eye contact.
sealed on the fuel side. Fay surface sealing is ap-
flush with water and get prompt medical plying sealant to one mating part before assembly.
attention. Enough sealant must be applied so it will squeeze out
completely around the joint when the parts are rivet-
12-45. MIXING SEALANT. Use all the accelerator ed or fastened together. The fillet seal is applied
and sealant in the container when mixing, to insure
after the joint is fay surface sealed and riveted or
the proper ratio of accelerator to sealant. Stir the fastened together. Fillet sealing is applying sealant
accelerator to absorb all floating liquid before it is
to the edge of all riveted oints, joggles, bend reliefs,
mixed with the sealant. The accelerator can then be
voids, rivets or fasteners through the boundary of the
poured into the container of sealant for mixing; other-
bay and any place that could produce a fuel leak. The
wise, a wax-free container must be used. Stir accel- fay sealant need not be cured before the fillet seal is
erator and sealant until it becomes a uniform mixture.
applied, but the squeezed out sealant, to which the
Do not allow air bubbles to mix in. If this occurs,
fillet sealant s applied, must be free of dirt and con-
work air bubbles out. tamintion. Fillets laid on intersecting joints shall be
joined together to produce a continuous fillet. Filler
12-46. SEALING DURING AND AFTER STRUCTURAL
sealant must be pressed into the joint, working out
REPAIR.
all entrapped air. The best method of applying seal-
ant is with an extruion gun. Then work the sealant
eliminate all air bubbles.
Protect drains and fuel outlet screens when
applying sealants. DO NOT plug drain NOTE
channels in hat section stiffeners. (See
figure 12-12.)
During structural repair, parts must be pre-
drilled, countersunk or dimpled and cleaned
Any repair that breaks the fuel bay seal will neces- before being seale and positioned for final
sitate resealing of that area of the bay. Repair parts installation
that need sealing must be installed and riveted during
the sealing operation. All joints within the boundary a. Remove all existing sealant from area to be
of the bay, but which do not provide a direct fuel path
3/4"
Max.
STAIN
Size will vary
RUNNING
with location LEAK
and
intensity.
3/4" to 1 1/2" SEEP
Fuel will usually flow in
this area along skin con-
WARNING
Fuel
usually drps
REFER TO PARAGRAPH 12-43 FOR FUEL BAY PURGING WHICH
SHOULD BE ACCOMPLISHED BEFORE REPAIRING FUEL BAYS.
Figure 12-10. Classification of Fuel Leaks
Revision 1
12-25