TB 1-1615-351-23
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.
l. Inspection of Main Rotor Agcoat. Wear through to blade surface not allowed.
m. Inspection of Tail Rotor Polyurethane Tape.
(1) 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.
(2) 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.
(3) Inspect for inboard and outboard ends of tape segments for disbonding. No more than 0.5
inch spanwise or chordwise is allowed.
(4) 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 disbonding on a single tape segment. There is no limit to the
number of disbonds per tape segment providing material is not torn.
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.
n. Inspection of Tail Rotor Agcoat. Wear through to blade surface not allowed.
o. Tape Repair. Replace the entire damaged piece of tape. Remove with a plastic scraper. Replace
per the installation instructions.
NOTE
TASK L-100 polyurethane paint may be utilized to repair damaged
areas of 3M 8663 polyurethane tape. The damaged tape areas must
not be larger than three inches in diameter. No more than a single
damaged area may be repaired per each thirty-six inch length of tape.
NOTE
All TASK L-100 polyurethane paint and 3M 8663 polyurethane tape
Applications to the aircraft must be maintained in accordance with
Technical Bulletin 1-1615-351-23.
(1) Scuff sand the damaged area with 80 grit sand paper to remove any dirt and debonded edges.
Change 3