Today's Message Index:
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1. 08:40 AM - Re: pitot system leaks (thomas sargent)
2. 08:59 AM - Re: pitot system leaks (Kevin Horton)
Message 1
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Subject: | Re: pitot system leaks |
I am still getting no where in testing my static system (or the static
system leaks horribly). Does the connection to the VSI have to be sealed
off before testing?
I tried bonding a vinyl tube (perpendicular) to a piece of heavy clear
plastic packing tape with GE silicone sealer. I cut a hole in the tape to
open it to the tube and then pressed that onto the fuselage with the
opening over the static port. I put a piece of packing tape over the other
static port and sucked on the tube. I could get the altimeter and VSI to
respond OK, but couldn't hold a deflection at all. I had to keep sucking a
lot of air thru the tube. Air might have been leaking around the rivet
that forms the static port where it penetrates the fuselage. When I stick
the tape+tube down to a flat smooth metal surface, it seems to seal well.
Some one said they used a veterinary syringe to draw a vacuum. How did you
get that to seal to the static port? The opening in the port is 1/16". All
of the syringes I have are significantly larger than that.
--
Tom Sargent
Message 2
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Subject: | Re: pitot system leaks |
On 2012-07-16, at 11:39 , thomas sargent wrote:
> I am still getting no where in testing my static system (or the static system
leaks horribly). Does the connection to the VSI have to be sealed off before
testing?
>
> I tried bonding a vinyl tube (perpendicular) to a piece of heavy clear plastic
packing tape with GE silicone sealer. I cut a hole in the tape to open it to
the tube and then pressed that onto the fuselage with the opening over the static
port. I put a piece of packing tape over the other static port and sucked
on the tube. I could get the altimeter and VSI to respond OK, but couldn't
hold a deflection at all. I had to keep sucking a lot of air thru the tube.
Air might have been leaking around the rivet that forms the static port where
it penetrates the fuselage. When I stick the tape+tube down to a flat smooth
metal surface, it seems to seal well.
>
> Some one said they used a veterinary syringe to draw a vacuum. How did you get
that to seal to the static port? The opening in the port is 1/16". All of the
syringes I have are significantly larger than that.
>
>
There is no need to seal off the VSI. But any of the pitot-static flight instruments
could have a leak.
It may be easiest to go at this piecemeal, only testing a small part of your system
at a time so you can narrow down where the leak might be. You could disconnect
and plug the forward end of the static line that comes from the rear fuselage
to the instrument panel. Then see if you still have a leak. Then try
a leak check on just the instrument panel portion of the system to see if that
part is OK.
--
Kevin Horton
Ottawa, Canada
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