TM 1-1520-238-23
11-1178
11.278.
TAIL ROTOR DE-ICE BRUSH BLOCK REMOVAL/INSTALLATION – continued
11.278.4. Cleaning
a. Clean removed and attaching parts or sur-
faces (para 1.47).
11.278.5. Inspection
a. Check cover and gasket for cracks, tears, or
cuts. None allowed.
b. Check swashplate attaching points for
cracks, nicks, and scratches (para 11.232).
c. Check removed and attaching parts for corro-
sion (para 1.49).
NOTE
Brush wear is measured from edge of
brush retainer to high point of brush.
d. Check brushes (15), (16), (17), and (18) for
wear.
(1) Hold brush block (12) upside down with
stackups (2) on near side.
(2) Check two forward brushes (15) and (16) for
minimum extension of more than 0.20 INCH.
(3) Check two aft brushes (17) and (18) for mini-
mum extension of more than 0.23 INCH.
e. Check brushes (15), (16), (17), and (18) for
cracks. None allowed.
f. Check block (12) for broken springs.
(1) Hold block (12) upside down.
(2) Gently depress brushes (15), (16), (17), and
(18), and check that internal spring returns it
its original position.
(3) If spring is broken, replace brush block.
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12
M04-3559-6
0.20 INCH MINIMUM
0.23 INCH MINIMUM
16
18
15
17
2
