Piper Navajo Chieftain PA-31-350 Service Manual page 181

NAVAJO CHIEFTAIN SERVICE MANUAL
e.
Clean the marked off area thoroughly with M EK or equivalent. For final cleaning. wipe the solvent
film off quickly w ith a clean cloth before it dries. Wash the back (rough surface) of erosion shield with a clean
cloth moistened with MEK. (The shield is dusted to prevent sticking.) Change cloths frequently to avoid
recontamination.
NOTE
Do both complete cleaning operations at least twice.
f. Thoroughly mix EC 1403 (or equivalent) cement before using. Apply one even brush coat to both the
back surface of erosion shield and the mating structure. up to the masking tape. Allow first coat to air dry a
minimum of 30 minutes. If temperature is below 50° F. allow cement to dry at least one hour. Apply a second
cement coat to both surfaces allowing to dry thoroughly for at least one-half hour. one hour preferred. Apply
cement evenly to assure smooth installation. Parts may be cemented up to a maximum of 48 hours before
actual installation. if cemented parts are covered and kept clean.
g. Using a straightedge. draw a line on the structure to connect the upper and lower marks previously
put on the masking tape. (Cement will now be dry and tack free.) Position the shoe on the structure (dry
cemented surfaces against each other) so reference lines coincide. Hold the shoe at its central area. Do not
move or change its referenced position as you prepare to activate the cement.
h.
Fold back the trailing edge and use a clean. lint-free cloth moistened (not dripping) with Toluol. to
activate ate the cement on the nose or leading edge of the shield. Activate mating areas. not to exceed one square
foot at a time. Avoid excessive e rubbing which could remove cement from surfaces. (Refer to Figure 4-3 . View
4.)
i.
Alter cement reaches "proper state of tack" (refer to Paragraph 4-115) roll activated part of shield
against structure with 2" sponge roller. Match reference lines as shield is rolled down. Use care to prevent
trapping air between shield and structure. Avoid stretching the shield: otherwise. difficulty will be encountered
around the lower periphery.
NOTE
When cementing. activating and rolling erosion shields on radomes
start at the center and work in concentric circles outward.
CAUTION
Avoid twisting or sharp creasing of shield. Otherwise cement may be
pulled loose from structure or shield. Should it be necessary to
remove or loosen an installed shield. squirt a little Toluol from clean
oil can to soften the "adhesion" line. Apply only minimum amount
of solveent while slight tension is applied to the shield. Allow solvent
to do most of the work of separating cemented coats because if
cement pulls loose from either the structure or shield. the area must
be recemented.
Added: 10/5/83 STRUCTURES
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