Today's Message Index:
----------------------
1. 05:04 AM - Re: Pressure Problem (Rob Rowe)
2. 05:04 AM - Re: Re: Pressure Problem (A. Dennis Savarese)
3. 06:55 AM - Re: Re: Pressure Problem (Bitterlich, Mark G CIV NAVAIR, WD)
4. 09:13 AM - Book publishing (Wei Chen)
5. 10:49 AM - Re: Book publishing (jblake207@comcast.net)
6. 11:42 AM - Re: Pressure Problem (Bill1200)
7. 11:51 AM - Re: Re: Pressure Problem (KingCJ6@aol.com)
8. 11:52 AM - Re: Re: Pressure Problem (A. Dennis Savarese)
9. 01:05 PM - Re: Re: Pressure Problem (Roger Kemp)
10. 04:24 PM - Re: Pressure Problem (Al Pickering)
Message 1
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| Subject: | Re: Pressure Problem |
Few additional thoughts to add to Dennis's sage advice on some areas worth exploring
next time it fails to charge up when airborne.
Assumptions - the flap actuators are probably leak free as you've successfully
cycled these on ground runs & the system has charged OK afterward.
Next airborne occurrence move gear selector to neutral to isolate gear system (don't
forget to cycle back to 'Up' before subsequently selecting 'Down' to land
as otherwise no back pressure to cushion operation and gear will deploy with
a bang!).
1 - if the pressure improves in neutral then you possibly have an (intermittent)
leak downstream in the gear (up) system - hence why this doesn't manifest itself
on the ground. Favourite here for an intermittent problem would be the front
gear selector itself. With a GIB you could try selecting gear Up again using
rear cockpit selector (isolates the front selector), if pressure improves then
overhaul front selector. Failing that then little option but to put the aircraft
on jacks and ground cycle gear till it happens again to fault find i.e.
the leak is keeping pace with the compressor output so the main air system doesn't
charge.
2 - if the pressure doesn't improve in neutral this may suggest the pressure regulation
valve (PRV) on the firewall has a problem. Get it cleaned / overhauled
and adjusted. There could be other devices causing a problem (as Dennis suggests)
but FWIW in my experience the PRV is often the culprit
YMMV - I had a long term intermittent air problem many years back that only occurred
airborne, that turned out to be a defect in the PRV itself that required
replacement (even after being overhauled). It would intermittently stick open
venting to atmosphere after the gear was selected down ... downstream pressure
drop triggered it presumably. Until the main air pressure fell to around 20kgf/cm2,
then it would snap shut again and the system would recharge ok. Fine for
a few flights then it would happen again! Had no re-occurrence in nearly 10
years since PRV replaced.
Hope this helps.
Brgds, Rob R.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=425351#425351
Message 2
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| Subject: | Re: Pressure Problem |
Yes, it would bleed down quickly.- But if it is staying closed and you ar
e not pressuring the main air tank with the engine running, it COULD be a g
unked up snot bottle.=0ADennis=0A=0A=0A=0A________________________________
=0A From: Bill1200 <billdykes52@hotmail.com>=0ATo: yak-list@matronics.com
=0ASent: Monday, June 23, 2014 7:54 PM=0ASubject: Yak-List: Re: Pressure Pr
ail.com>=0A=0AThanks Dennis, I'm looking at the pneumatic schematic (trying
to understand it), if it was the snot valve staying open, wouldn't it blee
d down fairly quickly when parked?=0A=0A=0A=0A=0ARead this topic online her
e:=0A=0Ahttp://forums.matronics.com/viewtopic.php?p=425346#425346=0A=0A
==================
Message 3
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| Subject: | Re: Pressure Problem |
Just some additional musings.
What I am reading here is that the aircraft was filled externally on the deck.
The aircraft held (more or less) pressure on the deck.
On startup and taxi, air was used and it built back up normally, which tends to
eliminate leaks at that exact moment of time.
After take-off, pressure would not build.
I'd suggest you might want to consider jacking the plane, putting the gear UP and
checking to see that you do not have an leak with the gear UP and not DOWN.
It is entirely possible for that to happen and your description is pretty
much pointing to it.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Bill1200
Sent: Monday, June 23, 2014 9:02 PM
Subject: Yak-List: Re: Pressure Problem
BTW Dennis, forgot to answer your question. Just bought this plane so no idea if
or when that was done.
Message 4
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Just published a book about my trip to fly around the world and want to
share it with my RPA friends.
http://www.amazon.com/Around-The-World-69-Days/dp/1599324024/ref=sr_1_1?
ie=UTF8&qid=1385997078&sr=8-1&keywords=around+the+world+in+69+days
I was able to land the airplane in Beijing Capital International
Airport, once a-life-time opportunity. But, I did this trip in Socata
TBM700, not CJ6-A. :-)
Fly safe!
Wei Chen
What would you attempt to do if you knew you couldn't fail?
Message 5
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| Subject: | Re: Book publishing |
Congrats on your round the world flight!=C2- I'll be your CP on your next
trip!=C2- Saber
----- Original Message -----
From: "Wei Chen" <weichen@sunshinet.com>
Sent: Tuesday, June 24, 2014 11:12:32 AM
Subject: Yak-List: Book publishing
Just published a book about my trip to fly around the world and want to sha
re it with my RPA friends.=C2-
http://www.amazon.com/Around-The-World-69-Days/dp/1599324024/ref=sr_1_1?i
e=UTF8&qid=1385997078&sr=8-1&keywords=around+the+world+in+69+days
I was able to land the airplane in Beijing Capital International Airport, o
nce a-life-time opportunity. But,=C2-I did this trip in Socata TBM700, no
t CJ6-A. :-)
Fly safe!
=C2-
Wei Chen
What would you attempt to do if you knew you couldn't fail?
===
Message 6
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| Subject: | Re: Pressure Problem |
Thanks to all. Good stuff and something I can do.
Is the PRV the same as the "pop/off" ???
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=425377#425377
Message 7
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| Subject: | Re: Pressure Problem |
Pressure Relief Valve
In a message dated 6/24/2014 11:43:30 A.M. Pacific Daylight Time,
billdykes52@hotmail.com writes:
--> Yak-List message posted by: "Bill1200" <billdykes52@hotmail.com>
Thanks to all. Good stuff and something I can do.
Is the PRV the same as the "pop/off" ???
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=425377#425377
Message 8
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| Subject: | Re: Pressure Problem |
Yes.
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 6/24/2014 1:40 PM, Bill1200 wrote:
>
> Thanks to all. Good stuff and something I can do.
> Is the PRV the same as the "pop/off" ???
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=425377#425377
>
>
Message 9
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| Subject: | Re: Pressure Problem |
Yes.
Doc
Sent from my iPad
> On Jun 24, 2014, at 1:40 PM, Bill1200 <billdykes52@hotmail.com> wrote:
>
>
> Thanks to all. Good stuff and something I can do.
> Is the PRV the same as the "pop/off" ???
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=425377#425377
>
>
>
>
>
>
>
>
>
>
Message 10
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| Subject: | Re: Pressure Problem |
When airborne leave the gear selector in neutral after gear up. If your pres
sure rises you know you have and actuator leak in the up mode.
Sent from Alspad.
> On 24 Jun 2014, at 8:29 am, "A. Dennis Savarese" <dsavarese0812@bellsouth.
net> wrote:
>
> When was the last time you removed the snot bottle and flushed it out thor
oughly through all three orifices (in, out and drain). Try that first. I t
hink you'll be quite surprised at how gunked up the snot bottle can get.
> Dennis
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>> On 6/23/2014 2:15 PM, Bill1200 wrote:
>>
>> Yak 52
>> Noticed on recent flight, pressure would not go above about 2.5. Filled i
t externally to pop off around 5 after landing. Checked it a several days la
ter, it had bled down to about 4.5, not unusual for this plane. Took it out t
o the ramp, actuated flaps until it decreased to about 3, revved it up and w
atched pressure build. Went for flight with starting pressure around 3, nev
er got higher than that during flight. Used U/S detector in both cockpits, a
round fittings, brakes, etc no leak detected. Stumped, any suggestions welco
me, thanks.
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=425342#425342
>>
>>
>>
>>
>>
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>>
>
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>
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