TB 1-1615-351-23
(a) This condition is caused by larger debris and will usually be found close to the leading edge and in the
outboard one-third of the rotor span. If the cut of average size the surrounding material will not be damaged and no
debonding will occur. This type of damage to the coating should not be treated until it is expected that further flight would
cause that area to debond and tear away. If that is the case, then cut out the debonded area with a sharp knife. Only
remove the debonded area. Repair by applying fresh coating, in several applications if necessary, to restore the coating
thickness. Allow the coating to set for at least six hours before grinding the rotor up to speed or flying the aircraft.
Application of TASK L-100 polyurethane paint to repair minor damage on agcoat material is authorized for this procedure.
(b) If mission requirements will not permit the proper time for repair and curing, simply cut away the loosened
material and fly.
g. Rotor Blades - Erosion/Spark Guard Coating (Removal).
CAUTION
Do not cut the rotor blade structure. Use extra caution when removing the material
from rotor blades made from composite materials.
This coating is relatively immune to most solvent and to abrasive cleaning techniques. The recommended removal
procedure is by scraping in a direction along the surface of the blade.
CAUTION
Rotor Blade Erosion Protection should be removed from the AH-64A and UH-60A
aircraft before operation in icing conditions.
h. Track and Balance. Track and balance in accordance with -23 aircraft TM.
i. Tail Rotor Blade Tape Installation.
Reference WARNINGS, b. above.
Reference Figure 3-30.
(1) Cleaning. Clean area on blade to be covered with cheesecloth or machinery towel dampened with MEK,
isopropyl alcohol, or denatured alcohol.
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