MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR M-5-220C
Rev. B 22/38
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 ad-
hesive, 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 ar-
ea 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.
For any repair or damaged area larger than 16 inches in any direction, refer to FAA AC
43.13 1B. Only use equal or next heavier weight fabric for repair patch. Do not substi-
tute any other products or brands in this procedure
SECTION III
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.
The lift struts are streamlined tubes attached to the wing and fuselage by means of AN
standard steel bolts. When inspecting the struts, check for nicks and dents and see that all bolts
are snug (not tight).
In handling the airplane on the ground, care should be taken to prevent damage to the lift
struts by pushing or lifting in the middle of the strut. Frequent inspection of the struts should be
made and any paint loss or minor corrosion should be sanded down to bare metal with fine sand-
paper and metal primer should be applied. After the primer is dried, a finish coat of the desired
color may be added. (See also page 11)
WARNING: Any unrepairable dents or punctures are cause for replacement of the strut.
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