TB 1-1615-351-23
(4) Mix and apply TASK L-100 POLYURETHANE PAINT to the damaged tape area per the
instructions in TB 1-1615-351-23 until the damage is repaired.
(5) Allow the TASK L-100 polyurethane paint application to cure six hours before operating the
rotor blades.
f. Coating Repair. Local damage to the polyurethane coating can be touched up by brushing
additional coating to the damaged area. Carefully remove the disbonded material. Scuff the damaged
area with 120 grit sandpaper. Wipe clean with MEK. Prime the area with AGC 1201-7 primer if the
blade surface is exposed. Coat the damaged area with sufficient coats of polyurethane coating to
match the thickness of adjacent areas. Application of TASK -100 polyurethane paint to repair minor
damage on agcoat material is authorized for this procedure.
g. Polyurethane Tape Removal. Slowly peel back over itself. Scrape tape with plastic scraper, if
necessary.
h. Track and Balance Check. Check track and balance of main rotor blade per -23 TM.
Remove adhesive promoter with cloth dampened with toluene.
i. Inspection Procedures.
(1) Inspection Of Main Rotor Polyurethane Tape.
(a) Inspect 2-inch tape for wear. No holes allowed.
(b) Inspect 4-inch tape for wear. No more than 0.5 inch wide spanwise or chordwise hole
allowed on trailing edge. No holes allowed on any other surface of tape.
(c) Inspect upper and lower trailing edge of tape for disbonding. No more than 0.25 inch
chordwise width for any spanwise length of tape or 0.5 inch chordwise width for 6 inches spanwise
length along a single piece of tape is allowed.
(d) Inspect for inboard and outboard ends of tape segments for disbonding. No more than
0.5 inch spanwise or chordwise is allowed.
(e) Inspect for internal disbonding of tape segments. No more than a single disbonding larger
than 3.0 inches spanwise and/or 2.0 inches chordwise is allowed. In addition, no more than a total of 6
square inches is allowed for multiple disbonds on a single tape segment. There is no limit to the number
of disbonds per tape segment providing material is not tom.
CAUTION
If damage is discovered and found to be within the above limitations,
do not trim off these damaged areas. Trimming off these damaged
areas creates an increasingly lighter blade and may cause an out of
balance condition.
(2) Inspection of Main Rotor Agcoat. Wear through to blade surface not allowed.
(3) Inspection of Tail Rotor Polyurethane Tape.
NOTE
Inspection procedures for the tail rotor may be found in UH-1H
Inspection Procedures.
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