PS Magazine - TB 43-PS-596
PS, The Preventative Maintenance Monthly
ISSUE 596
JULY 2002
I
f your Black Hawk’s auxiliary power unit (APU) APU OIL TEMP HI warning light
comes on and oil starts spewing out of the exhaust and onto the ramp, you may be
overservicing the APU.
Service the APU like it says in Para
1-3-9 of TM 1-1520-237-23. Add oil
slowly until the level in the sump is
between the ADD and FULL marks
on the dipstick when the oil is cold.
Don’t use the sight gauge because it
gives a slightly different reading. If
the oil is between ADD and FULL,
don’t try to get it to the FULL mark.
Too much oil is almost as bad as
not enough oil in the sump. Too much
oil in the APU can blow out power
turbine seals and cause a fire.
The APU is not level since it is
installed with a nose-high attitude, so
it’s easy to overfill.
PS 596
JULY 02
39
CH-47D, UH-60A/L, UH-1V, AH-64A/D…
C
rews, the last thing you want is to look like you’ve been zapped by lightning. That
can happen if you stand too close to the AN/ARC-220 high frequency radio antenna
when it’s keyed up.
So make sure no one is within 3 feet of the high-powered antenna when the pilot
or crew chief is self-testing the radio or transmitting. The farther away you are from
the antenna, the better off you’ll be.
If that doesn’t take you out, standing
too close to the antenna will get you a
dose of microwave radiation. You won’t
feel any heat, but you’ll be cooking from
the inside out, like a microwave.
So when the radio is on and communi-
cating long range or testing, be safe
rather than sorry. Keep your distance and
you won’t get burned.
Keep in mind that the dipstick reading could be
off a bit when servicing the APU. Play it safe and
fill the APU to no more than
1
∕
4
-in below the FULL
mark. That prevents pouring more than you need.
‘Course, if you’re worried about not getting
enough oil in the APU, don’t. It won’t start if a
low oil pressure situation exists. Bottom line is,
keep the oil between the lines.
Here’s
another
maintenance
tip…
where
did all
this oil
come
from?
looks like
some-
body
got happy and
poured too much
oil in my apu!
Don’t trust
sight gauge
Oil level between
ADD and FULL
Keep away from
antenna when
operating
Even voltages
as low as 50
volts are
dangerous.
UH-60…
Radio Antenna Will Light You Up
If you
touch
it, the high
voltage can
kill
you.
596. 38-39 (C)
5/24/02
11:02 AM
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