Today's Message Index:
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1. 06:09 AM - Re: Not charging much air in flight (Richard Romaine)
2. 07:26 AM - Re: Not charging much air in flight (motoadve)
3. 08:17 AM - Re: Re: Not charging much air in flight (Mark Pennington)
4. 05:56 PM - Re: Not charging much air in flight (AlaskaChang801)
Message 1
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| Subject: | Re: Not charging much air in flight |
Youre making pressure, just not keeping it...I start with the easy stuff. For
context, how long since last flight? Is it significantly colder than last flight?
Did you disturb anything since last flight (repack dryer, open any connections,
move any hard lines)? How fast does the pressure drop on deck, with tank
valve closed (minutes/hours/days)? and main tank was holding air its pressure
when valve is closed?
Looking for issues with seals, valves, b-nut/flares and cracked hard lines typically.
(Knock on wood) my compressor has never been an issue, not saying it cant,
but plenty of the above issues to trace before jumping to the hard stuff.
Seals can take a set or dry out when they sit too long between flights. Leaks
in actuators and their associated selector valves are not unusual. Grit is
the enemy of selector valves...failing actuators can provide it. If your dryer
isnt drying (if you have mist at wing root snot valve it may be time to repack
dryer) moisture in system can rot everything, including sealing surfaces,
and provide more grit.
Hard lines often crack on the inside radius of something stressed...either by disturbing
it during maintenance or flexed in normal ops (e.g. compressor output
line)...and can be hard to find because the crack may stay closed until stressed.
Ancient hard line is more prone to cracking.
B-nuts and flares leak when cross threaded or flares are cracked when b-nuts are
over tightened or coaxed into alignment.
In a quiet hangar, get some spray soapy cleaner (or high tech with an HVAC ultrasonic
leak detector, someone here probably has a favorite). Pressurize the system,
listen for leaks in the cockpit (usually gear/flap actuators or valves),
at the firewall and at your fill port. Spray soapy cleaner on anything youve
recently disturbed (lines/fittings) and if nothing obvious, all the firewall
lines/fittings and fill port. Cycle selector valves, ideally up on jacks for
gear! Does it leak less/same at neutral? Is the starter valve healthy (strong
pop on/off with pressure on)?
Theres plenty more places to look, but those have been my top tens...sometimes
you get lucky and a few cycles clears grit or re-lubricates a dry seal.
If you havent already, buy some hard line tubing stock, a tubing bender and cutter,
a flaring tool, and from Doug, b-nuts and flare inserts (ferrules?)... and
spares.
Cheers, Rich
Sent from my iPhone
Message 2
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| Subject: | Re: Not charging much air in flight |
Thanks for your detailed reply.
Last annual (first to me) we replaced all the air valves.
I fly it often, 2 or 3 times per week, last flight was 4 days ago, temps about
the same, high 40s.
Nothing was changed since last flight
Lately the snot valve has been very hard to open.
Surprisingly after this flight was easy to open (maybe because not much air was
left?) when I opened it had a lot less pressure than usual.
Have had an air leak in the rear flap lever, after I close the main air tank, it
looses air quick, 15 minutes and its gone, its been like this since I bought
the plane.
Main air tank is holding air.
--------
www.Backcountry182.com
Cessna 182 P
CJ -6
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=494090#494090
Message 3
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| Subject: | Re: Not charging much air in flight |
Larry
The air system is the heart and soul of the airplane after the engine.
If your new to air based control systems I would suggest reaching out to
Craig Payne. He owned a CJ and wrote a great information piece on the air
system with photos and trouble shooting information as well.
It is a good write up that will help you understand the system better if
you need the assistance.
If you have a good understanding. His info may shed some light was well.
Mark
N621CJ
On Sun, Dec 29, 2019 at 10:31 AM motoadve <larry@motoadventuring.com> wrote:
>
> Thanks for your detailed reply.
> Last annual (first to me) we replaced all the air valves.
>
> I fly it often, 2 or 3 times per week, last flight was 4 days ago, temps
> about the same, high 40s.
>
> Nothing was changed since last flight
> Lately the snot valve has been very hard to open.
> Surprisingly after this flight was easy to open (maybe because not much
> air was left?) when I opened it had a lot less pressure than usual.
>
> Have had an air leak in the rear flap lever, after I close the main air
> tank, it looses air quick, 15 minutes and its gone, its been like this
> since I bought the plane.
>
> Main air tank is holding air.
>
> --------
> www.Backcountry182.com
> Cessna 182 P
> CJ -6
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=494090#494090
>
>
Message 4
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| Subject: | Re: Not charging much air in flight |
I've been dealing with a similar issue, on mine. I can charge to 50 ATMs and go
fly and the compressor can't put the air back to anything higher than about 38
ATMs so I'm thinking I'm dealing with a tiny leak in the UP side somewhere.
Haven't been flying for over a month due to waiting on parts, but I'm going to
try and follow advice given on another Red Star site to soak the felt filter
on the top of the compressor and see if it helps seal the rings. If it does, then
I'm looking at a weak compressor. If not then it'll be leak detection time.
As for the snot valves. Mine started to become harder to open as they gunned up
and finally started to not seal properly when closed. So I replaced mine with
swagelok 1/4 turn stainless ball valves..SO MUCH NICER!!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=494098#494098
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