MAULE AIRCRAFT CORPORATION
MAINTENANCE MANUAL
FOR
M-4/C/S/T
14
Rev. B
4/13/16
FABRIC REPAIRS:
(Applicable to polyurethane paint on Ceconite fabric only)
(This Installation is approved for retrofitting - no M-4's were originally manufactured with this covering/paint)
REPAIRS
:
1. Small holes and damaged areas can easily be repaired without removing the existing
paint topcoat.
2. Trim the damaged area to a rectangular or circular shape.
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 sand-
ed 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 thin-
ner 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 adhe-
sive, working he edges down. Allow to dry at least 8 hours prior to any shrinkage.
SHRINKING THE REPAIR AREA:
1. 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 appli-
cation). Take care to feather sand as required during primer procedure to feather the re-
pair patch and blend in prior to topcoat spraying.
SPECIAL PRECAUTIONS:
1. For any repair or damaged area refer to FAA AC 43.13 1B paragraph 169. Only use
equal or next heavier weight fabric for repair patch. Do not substitute any other products
or brands in this procedure.
