PS Magazine - TB 43-PS-571
PS, The Preventative Maintenance Monthly
ISSUE 571
JUNE 2000
PS 571
35
JUN 00
OH-58 crews, if the turret on your Kiowa Warrior’s mast-mounted sight
(MMS) is getting sluggish, maybe the problem is old antifreeze.
The MMS turret is cooled with common automotive antifreeze. Over time, the
additives in the stuff can form gummy deposits that block circulation and cause
the turret to slow down or overheat.
The solution is to have your AVIM shop change the coolant now and after
every 300 flight hours of operation.
All coolant changes require the use of the existing turret holding fixture, NSN
4920-01-231-8514; the thermal control unit (TCU) service unit, NSN 3460-01-
346-1792; and the TCU power breakout box, NSN 4920-01-231-8512. Opera-
tion of the holding fixture, TCU service unit and TCU power breakout box are
described in TM 9-4935-778-13&P.
Make a note until TM 9-1240-778-23 is updated.
OH-58D . . .
the mms
is
sluggish
.
i wonder
why?
i don't
know. let me
look it up.
has the
antifreeze
been
changed
lately?
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