MAIN ROTOR DRIVE PLATE REMOVAL/INSTALLATION continued
a. Check mating surfaces of rotor head for
cracks and elongated bolt holes. None al-
b. Check drive plate for deformed or broken
teeth or cracks. None allowed.
c. Check drive plate teeth for excessive wear.
(1) Replace drive plate if wear area exceeds
0.785 INCH, measured from center of wear
d. Check drive plate teeth face for excessive pit-
ting or spalling.
(1) Replace drive plate if pitting or spalling ex-
ceeds 0.010 INCH deep or is outside 0.785
INCH wear area on any tooth. Use depth
e. Check mating surfaces of rotor head for cor-
rosion (para 1.49).
f. Check drive plate for corrosion (para 1.49).
Some drive plates are furnished with a
plug and plug adapter. The following in-
spection criteria is for those drive plates.
g. Check plug adapter and plug for corrosion
h. Check plug adapter and plug for cracks.
(1) Replace adapter or plug if cracks are found.
(a) Clean adapter and plug with alcohol and
a clean rag. Use alcohol (item 25, App F).
(b) Apply sealing compound to threads of
plug and install in adapter. Use sealing
compound (item 177, App F).
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