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brian-1927(at)lloyd.com
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 Posted: Tue Sep 25, 2007 4:20 pm Post subject: Yak-50 pneumatic system and nothing to do with Bernoulli. |
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On Sep 25, 2007, at 1:49 PM, Bitterlich, Mark G CIV Det Cherry Point,
MALS-14 64E wrote:
| Quote: | It is entirely possible to have a one way leak on a YAK-50 actuator.
Of course, if it were me, that aircraft would have been jacked and
cycled 5 times by now. What's the hold up?
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Additional comments:
If you are looking for both behavior and leaks, jack up the airplane,
remove the air line from the compressor, and feed it from a
compressed gas source like a separate air/N2 bottle. That way you can
pressurize the system to a known value, shut off the source, and put
the gear down or up. This will let you see just how much pressure is
used in each mode starting from a known value. (If you know the
volume change in the actuators you can even figure out ahead of time
what it should be -- after you calculate the overall system volume.)
In addition you can leave the gear or flap handle in any position and
see how fast the system leaks down with the respective handle in the
up, neutral (isolated), and down positions. That will let you find
where you have leak(s).
All you need is an adaptor from your scuba or N2 bottle to the input
of your snot valve.
In some of the aircraft you can use the ground refill port but
remember that the CJ6A and (I think -- not sure) the Yak-50 refill
the emergency system from the ground fill port. The Yak-52 may refill
the emergency side from the ground fill port too but I know it
doesn't refill the emergency system from the compressor. Verify this
and then decide if you want to pressurize the system from the ground-
fill port or by breaking the line from the compressor.
This will get you a lot more information than anything more we are
going to say here.
BTW, if you have a small tank of known volume and pressure, you can
connect it to the system and let the pressures equalize. From that
you can calculate the volume of the rest of the system, e.g. P1*V1 =
P2 * (V1 + V2). You know P1 and V1 from your small tank. You measure
P2 (new pressure). Solve for V2. (Don't forget to use absolute
pressure, not gauge pressure.)
If we knew all this stuff ahead of time, we could use the numbers as
a pneumatic system "health-o-meter".
--
Brian Lloyd 3191 Western Drive
brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
— Antoine de Saint-Exupéry
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
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mark.bitterlich(at)navy.m
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