(c) Apply notched piece of tape to blade with No. 86 promoter in location shown in figure 3-6.
(d) Apply 5 additional 36-inch long pieces of 2" wide tape with promoter inboard of the first piece
(e) Repeat Steps (7) through (9) for each blade.
(10) Install Blades. If removed, install main rotor blades per -23 TM.
c. Tail Rotor Tape Installation .
(1) Cleaning. Clean area shown in figure 3-7 with cheesecloth or machinery towel dampened with
MEK, isopropyl alcohol or denatured alcohol.
(2) Layout and Mask. Layout and mask off tail rotor for polyurethane tape application as shown in
(3) Cut Tape. Cut 4 pieces of 4 inch wide polyurethane tape 25 inches long. (Reference table 3-5).
(4) Surface Preparation. Scuff the masked off area with 120 grit sandpaper. Always sand in a
spanwise direction, figure 3-1, sheet 1. Use of power polishing sander is permitted for this procedure.
Do not sand the bare metal skin of helicopter rotor blades. Sanding bare metal
skin on helicopter rotor blades reduces the structural integrity and fatigue life of
(5) Cleaning. Wipe the masked area several times with cheesecloth or machinery cloth dampened
with MEK, isopropyl alcohol, or denatured alcohol, then wipe once again with a clean, dry cloth.
Perform procedural Steps (6) through (10) for one blade at a time.
(6) Application of Adhesive Promoter. Apply a thin coat of No. 86 adhesive promoter to the masked
area. Allow to dry at least five minutes, but not more than one hour before applying tape.
(7) Polyurethane Tape Preparation. Peel back one of the center (1 inch wide) backing strips from
the 4 inch wide tape approximately 3 inches as shown in figure 3-1, sheet 3 for the 8 inch wide tape.
(8) Tape Alignment. Align the tape in the position shown in figure 3-8 before pressing to blade.