TB 1-1615-351-23
d. Tail Rotor Agcoat Application.
CAUTION
Do not puncture bubbles after the adhesive has dried.
(1) Cleaning. Clean area shown in figure 3-38 with cheesecloth or machinery towel damped with
MEK, isopropyl alcohol, or denatured alcohol.
CAUTION
Some rotor blades may be painted with acrylic lacquer, and MEK can
adversely affect this paint and the subsequent quality of the erosion
protection. In this case, MEK should not be used as a cleaning agent.
(2) Masking. Mask off are a for polyurethane coating with Tuck tape as shown in figure 3-38.
NOTE
Surface preparation and cleaning are the most important steps to
ensure proper adhesion.
(3) Surface Preparation. Scuff the masked off area with 120 grit sandpaper. Only sand in a
spanwise direction as shown in figure 3-1, sheet 1.
(4) Cleaning. Clean area on blade to be covered with cheesecloth or machinery towel dampened
with MEK, isopropyl alcohol or denatured alcohol, then wipe once again with a clean, dry cloth.
(5) Mix Primer. Stir Part A of primer before using. Mix equal amounts of AGC 1201-7 primer
parts A and B (4 oz. of each) in a beaker and stir well. Close can and bottle after pouring out required
amount.
(6) Primer Application. Brush the primer on the blade in the area shown in figure 3-38 where the
coating will be applied. Allow the primer to dry a least one hour at 70 degrees F or above. Do not
handle the primed surface. If the primed surface becomes contaminated, lightly wipe it with denatured
alcohol.
(7) Mix Coating. Stir Part A of the coating before using. After the primer dries, mix 3/4 beaker of
AGC1201-1R polyurethane coating Part A with 1/4 beaker AGC1201-3R Part B in a can and mix well.
Do not stir again after it is mixed well. If a skin forms on top of the coating, remove it.
(8) Coating Application.
(a) Brush on 5 coats to the entire area shown in figure 3-38, allowing five minutes minimum
drying time between recoating a specific area. Brush on heavy coats with light pressure to avoid
damaging previous coats. If lumps form in the coating, discard and mix a new batch.
(b) Remove masking tape after the first 5 coats are applied and apply the remaining coats by
eye. Total number of coats are shown in figure 3-39. Allow the coating to cure 24 hours a 70 degrees F
or above.
NOTE
Wet primer can be cleaned up with denature alcohol or MEK. Wet
coating can be cleaned up with MEK.
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