Today's Message Index:
----------------------
1. 06:41 PM - Very odd gear behavior (Jon Boede)
2. 07:21 PM - Re: Very odd gear behavior (Richard Kelley)
3. 07:27 PM - Re: Very odd gear behavior (A. Dennis Savarese)
4. 07:37 PM - Re: Very odd gear behavior (A. Dennis Savarese)
5. 08:36 PM - Re: Paintball/scuba bottles (1906)
6. 08:43 PM - Re: Very odd gear behavior (Walter Lannon)
7. 09:57 PM - Re: Paintball/scuba bottles (Ttail)
Message 1
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| Subject: | Very odd gear behavior |
Flying a stock CJ, put the gear handle up and small pfffft and the gear stays locked
down.
Put the gear handle in down and land, no issues.
Take the bird and put it on the jacks in the hangar. Start with zero air, put the
gear handle up, slowly add air from the filler port and the gear comes up just
fine.
Ok, so maybe it was just a gremlin... go fly. Air now at full pressure, put gear
handle up and pffft ... nothing. Gear stays locked down. Try the read gear handle
and small pfffft and gear stays down. Read gear to middle, try front again
and gear stays down.
Put the gear handle down and land, no issues.
Any systems geniuses want to take a guess at whats up??
Jon
Message 2
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| Subject: | Re: Very odd gear behavior |
One way check valve from the emer side is bad.
Sent from my iPhone
> On Oct 6, 2019, at 7:39 PM, Jon Boede <jonboede@hotmail.com> wrote:
>
>
> Flying a stock CJ, put the gear handle up and small pfffft and the gear stays
locked down.
>
> Put the gear handle in down and land, no issues.
>
> Take the bird and put it on the jacks in the hangar. Start with zero air, put
the gear handle up, slowly add air from the filler port and the gear comes up
just fine.
>
> Ok, so maybe it was just a gremlin... go fly. Air now at full pressure, put gear
handle up and pffft ... nothing. Gear stays locked down. Try the read gear
handle and small pfffft and gear stays down. Read gear to middle, try front again
and gear stays down.
>
> Put the gear handle down and land, no issues.
>
> Any systems geniuses want to take a guess at whats up??
>
> Jon
>
>
>
>
Message 3
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| Subject: | Re: Very odd gear behavior |
The emergency side check valve is most likely allowing air pressure from
the emergency system to move the diverter valves; thus blocking the main
side. It's just like opening the emergency air valve and moving the
diverter valves. Unless you bleed off the air pressure after you close
the emergency air valve, when you attempt to retract the gear, the gear
will not retract because the diverter valve is blocking the main side
air pressure.
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 10/6/2019 9:39 PM, Jon Boede wrote:
>
> Flying a stock CJ, put the gear handle up and small pfffft and the gear stays
locked down.
>
> Put the gear handle in down and land, no issues.
>
> Take the bird and put it on the jacks in the hangar. Start with zero air, put
the gear handle up, slowly add air from the filler port and the gear comes up
just fine.
>
> Ok, so maybe it was just a gremlin... go fly. Air now at full pressure, put gear
handle up and pffft ... nothing. Gear stays locked down. Try the read gear
handle and small pfffft and gear stays down. Read gear to middle, try front again
and gear stays down.
>
> Put the gear handle down and land, no issues.
>
> Any systems geniuses want to take a guess at whats up??
>
> Jon
>
>
Message 4
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| Subject: | Re: Very odd gear behavior |
One other test you can do is, with the main and emergency valves fully
closed, squeeze the brake handle until your deplete all the air/until
you can no longer hear the "woosh" sound when you release the brake
handle. Next, let the airplane sit for at least 4 hours. Then when you
come back to the airplane, immediately go to the cockpit and squeeze the
brake handle. If you hear the "woosh" sound again, you'll know you have
either a leaking emergency air valve or as previously mentioned, a bad
check valve.
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 10/6/2019 10:20 PM, Richard Kelley wrote:
>
> One way check valve from the emer side is bad.
>
> Sent from my iPhone
>
>> On Oct 6, 2019, at 7:39 PM, Jon Boede <jonboede@hotmail.com> wrote:
>>
>>
>> Flying a stock CJ, put the gear handle up and small pfffft and the gear stays
locked down.
>>
>> Put the gear handle in down and land, no issues.
>>
>> Take the bird and put it on the jacks in the hangar. Start with zero air, put
the gear handle up, slowly add air from the filler port and the gear comes up
just fine.
>>
>> Ok, so maybe it was just a gremlin... go fly. Air now at full pressure, put
gear handle up and pffft ... nothing. Gear stays locked down. Try the read gear
handle and small pfffft and gear stays down. Read gear to middle, try front
again and gear stays down.
>>
>> Put the gear handle down and land, no issues.
>>
>> Any systems geniuses want to take a guess at whats up??
>>
>> Jon
>>
>>
>>
>>
>
>
Message 5
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| Subject: | Re: Paintball/scuba bottles |
Ttail wrote:
> I run a 2L bottle at 4500psi. I just use the stock paint ball req. I very very
slowly just crack the reg its very controllable.
> I run a Stauf fitting from the Paint ball outlet. Stuaf fitting goes into 1/4"npt.
this runs through some very high pressure certified hose to a Baynot fitting
>
> This shows the Connections using a 1.5L bottle before I moved up to 2L bottle.
There is a pressure bleeder on the end near the bayonet fitting to bleed residual
line pressure before disconnect.
>
> (https://postimages.org/)
>
> Second image shows size comparison between 2L v 1.5L bottles
> (https://postimages.org/)
Ttail, does someone sell this entire kit? I have not seen those fittings or fill
port before.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=491659#491659
Message 6
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| Subject: | Re: Very odd gear behavior |
Hi Richard;
Dennis has you on the right track here but I am attaching a sketch with the
location of the the check valve that may have failed internally and is
leaking NORMAL system air into the EMERG. operating system.
That is assuming you did NOT do an Emergency down test prior to flight and
failed to bleed the system as Dennis described.
Walt
-----Original Message-----
From: Richard Kelley
Sent: Sunday, October 06, 2019 7:20 PM
Subject: Re: Yak-List: Very odd gear behavior
One way check valve from the emer side is bad.
Sent from my iPhone
> On Oct 6, 2019, at 7:39 PM, Jon Boede <jonboede@hotmail.com> wrote:
>
>
> Flying a stock CJ, put the gear handle up and small pfffft and the gear
> stays locked down.
>
> Put the gear handle in down and land, no issues.
>
> Take the bird and put it on the jacks in the hangar. Start with zero air,
> put the gear handle up, slowly add air from the filler port and the gear
> comes up just fine.
>
> Ok, so maybe it was just a gremlin... go fly. Air now at full pressure,
> put gear handle up and pffft ... nothing. Gear stays locked down. Try the
> read gear handle and small pfffft and gear stays down. Read gear to
> middle, try front again and gear stays down.
>
> Put the gear handle down and land, no issues.
>
> Any systems geniuses want to take a guess at whats up??
>
> Jon
>
>
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Message 7
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| Subject: | Re: Paintball/scuba bottles |
The Stuaf fittings are available commercially in Australia. The Adapter to go on
to the fill port we had made up in a CNC shop. So its a case of shopping for
what you want then assembling it. In my case I was lucky enough to be put in
contact with a Gent that deals with pneumatic stuff for the railways.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=491661#491661
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