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dsavarese0812(at)bellsout
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 Posted: Mon Jul 22, 2013 7:51 am Post subject: No Title |
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First, using a spray bottle of soapy water, remove the cover from the
external air fill port and spray the opening. If it bubbles and the
main air system is leaking down, you have a check valve on the firewall
(the one on the left side of the pop off valve "cross" and closest to
the oil tank) leaking. If the emergency is leaking down (you did not
mention this), the check valve for the emergency system is just inside
the fuselage at the external air fill port.
Next, with the main air tank filled, open the snot bottle and see if
there are any bubbles coming from the drain tube on the snot bottle. If
it bubbles, the check valve on the right side of the pop off valve cross
is not shutting off.
Check these out first and let me know either off list or on. Whichever
you prefer.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 7/22/2013 9:52 AM, delfin wrote:
| Quote: | Looking for any opinions of problem. My yak has always held air in
the main system and did not leak at all. On most recent flight I came
to airport and found the air completely gone
and the handle to turn on air very tight to move. I filled the
system and went flying. It charged up to 4 in a one hour flight. But
did not go back up to 5 range where it used to be. It would seem that
I have a non-return (ck valve) sticking. Where do you suggest to
start to look . thanks
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Rob Rowe
Joined: 10 Jan 2006
Posts: 124
Location: Berkshire, UK
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| Posted: Mon Jul 22, 2013 11:34 pm Post subject: Re: No Title |
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If it's a YAK-52 then also repeat Dennis's soapy water spray test on the pressure regulation valve (PRV) that sits between the two air source check valves (external & compressor via snot pot) on the top right (from front) of the firewall.
On a -52 a tired PRV could explain both the leak down between flights & the inability to recharge beyond 40 kgf/cm2 in flight ... may need to be cleaned/adjusted and/or seals replaced.
Hope this helps.
Rob R
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keithmckinley
Joined: 11 Aug 2008
Posts: 434
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| Posted: Wed Jul 24, 2013 7:25 pm Post subject: Re: No Title |
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This is a Yak, not a CJ correct?
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