THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 8
Jun 1/03
3C18
28-10-00
(i) A loose edge may be trimmed provided a 0.50 inch minimum lap or seam is maintained.
CA
UTION: FOR EACH 10°F DROP IN TEMPERATURE FROM 75°F, ADD 20 HOURS
CURE TIME. FOR EXAMPLE: AT 65°F, CURE FOR 92 HOURS.
(j) Air cure repair patches are to remain clamped and undisturbed for 72 hours at a room
temperature of approximately 75°F.
(k) All heat cured patches are ready for use when cool.
(l) Fitting repairs are confined to loose flange edges, seal surface rework and coat stock.
(m) The maximum number of heat cure repairs in the same area is four.
(3) Heat Cure Repair Patch Method
The exterior patch is applied to the exterior cell wall and cured, first; then, the interior patch is
applied to the interior cell wall.
(a) Preparation
1
Cut a repair patch from FT-192 material to size required to insure a proper lap over
injury in all directions. (See Limitations, above.)
a Hold shears at an angle to produce a beveled edge (feather) on patch. (Dull side
or gum contact face of repair patch should be largest surface after beveling.)
b Round corners of patch.
2 Wash one square foot of cell wall surrounding injury with a clean cloth soaked with
Methylethylketone solvent.
3 Wash repair patch contact side with a clean cloth soaked with Methylethylketone
solvent.
4 Abrade cell wall surface about the injury and on the contact side of patch with fine
emery cloth to remove the shine.
5
Repeat Methylethylketone washings two more times, for a total of three washings for
each surface.
6
Tape a 8’’ x 8’’ piece of cellophane inside the cell over the injury.
(b) Position cell for patch application on repair table.
(c) Mix the 80C27 cement (320 gms) with the cross-linker 80C28 (81cc), and stir mixture
thoroughly, for five minutes.
NOTE: Cement must be at a minimum of 70°F before mixing. Keep away from water and
excessive heat.
(d) Brush one even coat of mixed repair cement on the cell wall around the injury and on the
contact side of the repair patch. Allow to dry for fifteen minutes.
CAUTION: DO NOT USE THE FIRST CAN OF MIXED CEMENT FOR SECOND COAT.
(e) Repeat a second mixing of repair cement and brush a second coat.
CAUTION: MAKE SURE CELLOPHANE INSIDE CELL OVER INJURY REMAINS IN
PLACE BECAUSE CEMENT WILL STICK CELL WALLS TOGETHER
WITHOUT IT AS A SEPARATOR.
(f) After cement has dried approximately five minutes, center patch over injury.
1 Lay patch by rolling it down on surface from center to edge without trapping air.
2
Hold unrolled portion of repair patch off cemented surface until roller contact insures
an air-free union.
3
The patch may now be moved by hand on the wet surface to improve lap. Do not lift
repair patch, slide it.
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