MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
M-4-180V
19
Rev. A
4/13/16
3.
Lightly scuff sand with #320 or #400 wet/dry sandpaper approximately 2 inches around
the repair area.
4.
Mix one part gray urethane primer (catalyst) with two (2) parts gray urethane primer (2:1
ratio - 2 parts paint/1 part catalyst), mixing a very small amount only for coating the
sanded area around the repair.
5.
Apply one coat (this may be brushed) to the sanded area slightly larger than the size of
the patch to be applied. This application aids in total adhesion to the topcoat and offers
a fresh chemical adhesion base for the repair patch.
6.
Allow prime to dry for 4 hours.
7.
Apply a coat of urethane adhesive (thinned one to one (1:1) with urethane adhesive
thinner by volume) to the primed area slightly larger than the repair patch size. Allow
this to dry for approximately 15 minutes.
8.
Apply a second coat of the thinned urethane adhesive and lay the patch in the wet bed
of adhesive, smoothing the edges while applying a topcoat of the thinned urethane
adhesive, working he edges down. Allow to dry at least 8 hours prior to any shrinkage.
SHRINKING THE REPAIR AREA:
When using an iron to shrink the patch, always use a piece of aluminum foil over the
area to be tautened and the surrounding undamaged topcoat. This is to prevent any
scorching of the topcoat. Follow the procedure previously mentioned (primer and finish
coat application). Take care to feather sand as required during primer procedure to
feather the repair patch and blend in prior to topcoat spraying.
SPECIAL PRECAUTIONS:
For any repair or damaged area, refer to FAA AC 43.13 1B. Only use equal or next
heavier weight fabric for repair patch. Do not substitute any other products or brands in
this procedure
SECTION III
MAJOR COMPONENT PARTS
WINGS:
The complete wing is of metal construction (2024-T3 aluminum) with a fiberglass wing tip.
Spar root end strut fittings are made of 2024-T4 aluminum.
