If damage is discovered and found to be within the above limitations, do not trim
off these areas. Trimming off these damaged areas creates an increasingly lighter
blade and may cause an out of balance condition.
n. Inspection of Tail Rotor Agcoat. Wear through to blade surface not allowed.
o. Tail Rotor L-100 Coating Application (Tip Caps).
(1) Remove tip caps and clean area as shown in figure 3-9.
(2) Tape off area for L-100 coating with masking tape as shown in figure 3-9.
(3) Sand the area to be coated to remove bugs, dirt and oxidized coating. As a minimum, scuff the
existing paint over the total area to be protected. Always sand in a spanwise direction.
(4) Dry wipe the blade with a clean cheesecloth or towel to remove the sanding residue. Wipe the
blade several times with cheesecloth dampened with denatured or isopropyl alcohol, then wipe once
again with dry cheesecloth.
(5) Inspect the surface for any greasy looking areas. Sand these areas a little more vigorously to
take away the sheen. Wipe the blade again with the cheesecloth. The blade should now be dry and free
from sanding residue. Avoid touching or contaminating the prepared surface after it is wiped.
(6) Remove the old masking tape and replace with new as required to repair tape damaged by
sanding. Mark coating application spanwise dimensions on the tape before starting to apply the coating.
Make sure all screw heads are covered with masking tape. Screw heads must not be coated.
(7) Mix the coating as follows:
(a) The coating consists of individual foil packets, each of which contain Part A of the two-part
coating (in a pull-top can which is about half-filled), Part B (in a syringe with a tip cap) and a stir stick to
mix them. Parts A and B are pre-measured to assure proper cure.
The coating will not wash off and can be irritating to the skin. Wear gloves and
safety goggles when mixing and applying this product.
(b) To mix the coating, open Part A. Remove the tip cap from Part B and squirt the full
contents into the can containing Part A. Stir the mixture for a full 60 seconds using the stick provided,
being careful to scrape the sides of the can with the stick occasionally to assure total mixing of both
parts. You have only 5-10 minutes to get the coating out of the can; so don't start mixing until you are
ready to star the application. The coating cures faster in the can than it does on the blade.
(8) Brush on two coats as shown in figure 3-10, covering the area indicated.
(9) Use a new paint brush when the old brush starts to drag. It should take a new brush every two
to three cans to do the job properly.
(10) If the blades are on the aircraft, coating the bottom will take a different technique. As you coat
the bottom you must keep working the material until it starts to set. Long, smooth strokes with the brush
being pulled at a low angle to the blade works best.