PS Magazine - TB 43-PS-618
PS, The Preventative Maintenance Monthly
ISSUE 618
MAY 2004
the Bubble
PS 618
MAY 04
39
MAY 04
UH-60A/L/Q…
Look For
For example, don’t forget to inspect
the viscous dampers like it says in
Para 4.1 of TM 1-1520-237-PMS-1.
When it’s time to service the tail
rotor drive shaft viscous dampers, like
it says in Para 1-3-16 of TM 1-1520-
237-23-1, check for leaks and make
sure you can see the bubble in the
fluid of all four dampers.
The bubble should be no more than
1/2-in long. If you can see through the
damper tube fluid, you might have a
leak problem that may require replac-
ing the viscous damper tube.
When checking for the bubble, use
a flashlight to help you see.
If your bird experiences extreme hot and cold temperatures or frequent climate
changes, it’s really important to keep an eye on the dampers. Not checking them could
cause the drive shaft bearings to overheat or seize, or cause drive shaft separation.
Mechanics, keep looking around
because there’s always something
you might have
missed
during
your 10-hour/14-day Black Hawk
inspections.
Check
viscous
dampers
for bubble
with
flashlight
OK, let’s
inspect your
dampers.
ugh! I
can’t see
a
thing!
Try using a
flashlight.
it’ll
be easier to find
the bubble and
spot trouble!
if you find
the bubble,
I’ll be
good
to go!
618. 38-39 (C)
3/29/04
10:49 AM
Page 1
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