TB 1-1615-351-23
(4) Nicks and Cuts.
CAUTION
Be careful when using a knife for trimming. Do not cut into the blade. The safest
technique is to work the knife under the loose material and cut parallel to the blade
surface.
This condition is caused by larger debris and will usually be found close to the
leading edge. Cuts where the surrounding materials are not damaged and no
debonding has occurred are average size cuts. This type of damage to the boot
should not be treated until it is expected that air flow in flight would cause the area
to debond and tear away. If that is the case, and the debonded area is less than
thirty-six square inches on the trailing edge are or fifteen square inches on the
leading edge are, then cut out the debonded area with a sharp knife. Only remove
the debonded area. Repair by applying fresh coats of TASK L-100 polyurethane
coating to restore the boot to its original thickness. Allow the new coating to set
for a least six hours at 77 degrees Fahrenheit (lower temperatures require longer
cure time) before bringing the rotor up to speed or flying the aircraft.
(5) Boot Replacement. If it is determined that a damaged boot may not be repaired by the previous stated
methods the boot must be removed. The boot is impervious to chemical removal and must be removed manually by
scraping parallel to the blade surface and peeling. Use of a hard plastic scraper with a sharp edge, such as a windshield
scraper, is highly recommended for this procedure. Replace the boot per the installation instructions and track and
balance the blade when finished.
(6) If mission requirements will not permit the proper time for repair and curing. Simply cut away the loosened
material and fly.
(7) If the blade has been damaged enou gh to warrant depot repair, the tip cap boot must be removed before
turning the blade in for rework
n. Boot Removal. Removal of boot may be accomplished with the blades on or off the aircraft. All boots must be
removed from the aircraft if boots are to be removed. Flight operations wit a partially removed boot or boots is not
allowed. Removal procedures include the following:
(1) The boots are relatively immune solvents and abrasive cleaning techniques. The recommended removal
procedure is by scraping in a parallel direction along the surface of the blade. Use of a thick plastic scraper with a sharp
edge is highly recommended for this procedure.
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