Piper Navajo Chieftain PA-31-350 Service Manual page 876

NAVAJO CHIEFTAIN SERVICE MANUAL
a. Holding the backside of the boot close to the leading edge, fasten the end of each non-kink hose to the
corresponding air connection stem. Tinnerman or other suitable non-kink hose clamps should be used for this
purpose. Tighten each clamp with a pair of slip joint pliers but do not squeeze the clamp so tight that the hose
is damaged.
b. Push the hose connections into the leading edge grommets or seals. as the case may be. Obtain
sufficient personnel to hold boot steady during installation. (Limit handling cemented side of boot with fingers.)
Position the deicer centerline to coincide with leading edge centerline. Hold boot in this position while reacti-
vating about 3 inches around connections and around corresponding holes in leading edge, using a clean, lint
free cloth moistened with Toluol. Insert connections in leading edge holes when cement has dried to a tacky
state, and rubber roll boot to leading edge in tacky area. Continue installation by reactivating the cement along
the centerline leading edge surface and boot in spanwise strips approximately 6 inches wide. Rubber roll the
deicer firmly against the wing leading edge. being careful not to trap any air under the deicer. Always roll
parallel to the inflatable tubes.
c. If the deicer should attach "off course", use MEK to remove and reposition properly. Avoid twisting,
sharp bending or jerking boot loose from bonded area of the deicer.
d. Rubber roll, applying pressure over entire surface of the deicer. All rolling should be done parallel to
the inflatable tubes. Roll trailing edges with a narrow stitcher roller.
CAUTION'
Avoid excessive soaking or rubbing of the cement which could
remove the cement from the surface.
Remove all masking tapes. and clean surfaces carefully with Toluol so that no solvent will run under
deicer edges.
e. Apply masking tape to deicer edges where exposed trimmed ends or gaps between sections are to be
filled with 3M EC-801 sealing compound.
Apply masking tape to deicer approximately 1 4 inch in from trailing edges, and tape wing skin
approximately 1/4 inch from trailing edges. both forming at neat. straight line.
f. Apply two brush coats of A-56-B cement to surfaces between tapes and to EC-X0OI seams. being sure
that the conductive coating (A-56-B) is continuous from the deicer surface to the wing painted surface. Allow
10-15 minutes drying time between coats.
g. Remove tapes immediately after applying A-56-B cement (before cement dries).
NOTE
Application of A-56-B conductive cement is not necessary on
deicers that have "CONDUCTIVE" noted on labels.
CAUTION
The cements and solvents used for installation are flammable
and their fumes slightly toxic. Therefore, all work should be
done in a well-ventilated area away from any sparks or flames.
(Use of solvent resistant type gloves is recommended.)
In the event it becomes necessary to remove or loosen installed boots, use MEK to soften the adhesion
line. A minimum of this solvent should be applied to the seam line while tension is applied to peel back the
boot. This removal should be slow enough to allow the solvent to undercut the cement, thus preventing injury
to the part. Excessive quantities of solvent must be avoided.
Revised: 3/31/94 ACCESSORIES AND UTILITIES
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