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UFO
Joined: 29 Jul 2007
Posts: 18
Location: Salt Lake City , Utah
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 Posted: Mon Oct 01, 2007 6:07 am Post subject: English / left main gear strut |
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Doc, Dawg and others of like mind. Briefly, "Numbers USA " is the best tool we have to keep American values, corrupt politicians in check, and LEGAL immigration into this country the way it was meant to be. Find it on the net and subscribe. It really works and you'll like it.
Back to Yaks. I have a small problem with what appears to be my main gear strut inflation again. I had them worked on and apparently fixed when they were serviced with both CO2 and hydraulic fluid. Both had been down and dirty before and the plane lurched and wobbled while taxiing. It taxied great for the first few flights afterward, but now the left strut/wing seems to be dropping the same way even though the CO2 charge is still full. I haven't noticed any Hydraulic fluid leaks, and it appears to just be the left one. That strut also has thin vertical grease lines indicating that it has indeed compressed. The right one does not. I've also been getting a left "gear not up and locked" indication on my light panel when I bring the gear up but the gear up stick indicators are fine and my mechanic says it's just the indicator and "we'll fix that in the December Annual". The mechanic had also adjusted the uplocks prior to this. He says that the strut problem may just be me using too much braking. I'll be the first one to look at "Operator error" as the problem, and I did before I ever brought the mechanic into the loop on this, but I really don't think so. The odd thing is, the left wing dropped when I started the engine on the ground as well, before the aircraft was ever in motion.
Any ideas on this strange set of circumstances out there in the collective CJ wisdom?
- Val
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dsavarese(at)elmore.rr.co
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| Posted: Mon Oct 01, 2007 6:25 am Post subject: English / left main gear strut |
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Val,
Two things come to mind. The strut should be serviced with Nitrogen not Carbon Dioxide. I've never heard of a strut being serviced with CO2. The cause of problem with the left strut sagging could be either the strut seals or the valve used to pressurize the strut is leaking. Either or both could cause the pressure in the strut to leak down. The strut should probably be disassembled and have new seals put in it.
As for the gear not indicating UP and LOCKED, it could very well be caused by the adjustment made by your mechanic. The uplocks and their associated micro switches must be properly adjusted in order to see an UP and thus LOCKED indication. Most likely, I'd bet the microswitch is not adjusted properly. It would be best to make this adjustment with the airplane on jacks so the gear can be retracted and tested to verify UP and LOCKED.
Dennis
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UFO
Joined: 29 Jul 2007
Posts: 18
Location: Salt Lake City , Utah
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| Posted: Mon Oct 01, 2007 7:13 am Post subject: Re: English / left main gear strut |
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Obviously, I must be breathing too much CO2. LOL Of course I meant nitrogen. Thanks for the input Dennis.
- Val
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cjpilot710(at)aol.com
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| Posted: Mon Oct 01, 2007 7:28 am Post subject: English / left main gear strut |
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In a message dated 10/1/2007 10:26:44 A.M. Eastern Daylight Time, dsavarese(at)elmore.rr.com writes:
Val,
I agree with Dennis. The failure of up-lock indication can't have anything to do with strut pressure because the distance from the gear pivot point at the wing attachment; to the up-lock bracket where up micro switch is located is a fix distance. It will never change. The same with the gear indicator on the wing.
Sometime the seals in the shock will get "rolled" or twisted and cause a leak. Its not so bad, if the wing dips during braking but if it does not come right back up, it time to check the pressure for sure. That "dipping" is part of the shock absorbing action. A little is OK but to much or slow recovery to level, means the pressure ought to be checked.
Jim "Pappy" Goolsby
[quote] Val,
Two things come to mind. The strut should be serviced with Nitrogen not Carbon Dioxide. I've never heard of a strut being serviced with CO2. The cause of problem with the left strut sagging could be either the strut seals or the valve used to pressurize the strut is leaking. Either or both could cause the pressure in the strut to leak down. The strut should probably be disassembled and have new seals put in it.
As for the gear not indicating UP and LOCKED, it could very well be caused by the adjustment made by your mechanic. The uplocks and their associated micro switches must be properly adjusted in order to see an UP and thus LOCKED indication. Most likely, I'd bet the microswitch is not adjusted properly. It would be best to make this adjustment with the airplane on jacks so the gear can be retracted and tested to verify UP and LOCKED.
Dennis
[quote] ---
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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netmaster15(at)juno.com
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| Posted: Mon Oct 01, 2007 11:19 am Post subject: English / left main gear strut |
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VAL, Change the CO2 ,try nitrogen, Change the seals, change the mechanic,
Regards,
Cliff
-- "V. Walker" <Valkyre1(at)utahbroadband.com> wrote:
Doc, Dawg and others of like mind. Briefly, "Numbers USA " is the best tool we have to keep American values, corrupt politicians in check, and LEGAL immigration into this country the way it was meant to be. Find it on the net and subscribe. It really works and you'll like it.
Back to Yaks. I have a small problem with what appears to be my main gear strut inflation again. I had them worked on and apparently fixed when they were serviced with both CO2 and hydraulic fluid. Both had been down and dirty before and the plane lurched and wobbled while taxiing. It taxied great for the first few flights afterward, but now the left strut/wing seems to be dropping the same way even though the CO2 charge is still full. I haven't noticed any Hydraulic fluid leaks, and it appears to just be the left one. That strut also has thin vertical grease lines indicating that it has indeed compressed. The right one does not. I've also been getting a left "gear not up and locked" indication on my light panel when I bring the gear up but the gear up stick indicators are fine and my mechanic says it's just the indicator and "we'll fix that in the December Annual". The mechanic had also adjusted the uplocks prior to this. He says that the strut problem may just be me using too much braking. I'll be the first one to look at "Operator error" as the problem, and I did before I ever brought the mechanic into the loop on this, but I really don't think so. The odd thing is, the left wing dropped when I started the engine on the ground as well, before the aircraft was ever in motion.
Any ideas on this strange set of circumstances out there in the collective CJ wisdom?
- Val
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| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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UFO
Joined: 29 Jul 2007
Posts: 18
Location: Salt Lake City , Utah
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| Posted: Mon Oct 01, 2007 11:39 am Post subject: Re: English / left main gear strut |
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Apparently I've been breathing too much CO2 guys, LOL. Of course I meant nitrogen in the servicing. Thanks for the input and I'll check the seals.
- Val
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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