PS Magazine - TB 43-PS-689
PS, The Preventative Maintenance Monthly
ISSUE 689
APRIL 2010
34
PS 689
APR 10
35
PS 689
APR 10
M
ost scary movies have scenes that can really shock you right out of your seat,
mechanics.
Doing voltage checks incorrectly on your AH-64D’s regulated transformer rectiFer
unit (R/TRU), NSN 6120-01-440-5711, can shock you, too.
You must Frst remove the bracket
from the back of the R/TRU when
aircraft power is off.
To get a voltage reading, aircraft
power must be on. Some mechanics
think
they
can
just
place
the
multimeter leads through the bracket
while it’s still installed. But that’s
not the case. Placing the leads in the
wrong place causes arcing. If that
happens, you could get the shock
of your life, burns and/or damaged
equipment.
The
R/TRU
voltage
check
is
measured with a mulitmeter across
the positive and negative terminals
after the cover has been removed.
Remember
that
you’re
dealing
with electrical systems and the two R/
TRUs provide primary DC electrical
power for your bird. So make sure
voltage checks are done by the book,
not by the seat of your pants.
AH-64D…
The
Shock
of Your Life
Remove bracket before testing
next time you
should take off
the bracket from
the r/tru when
you’re doing
voltage checks!
Never
do this
at that
very moment,
on a sun-
drenched
beach in the
caribbean…
honestly, son, I
don’t know why a big
ol’ oaf like you can’t
do this himself!
awww, mom. you
know it’s all in
the angle. and
nobody does
it better than
you!
689.34-35.indd
1-2
2/23/10
3:23:27 PM
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