Sender: <marv@lancaironline.net>
To:  lml@lancaironline.net
Date: Fri, 23 Oct 2009 11:53:15 -0400
Message-ID: <redirect-3896768@logan.com>
Received-SPF: pass
 receiver=logan.com; client-ip=65.55.116.104; envelope-from=randystuart@hotmail.com
From: "Randy" <randystuart@hotmail.com>
References: <list-3896582@logan.com>
Subject: Re: [LML] Re: LNC2 Hydraulic Gear Operation Fix
MIME-Version: 1.0
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=original
Content-Transfer-Encoding: 7bit

Yes, this analysis IS incorrect.


----- Original Message ----- 
From: "Bob B." <rbelshe@comcast.net>
To: <lml@lancaironline.net>
Sent: Friday, October 23, 2009 6:49 AM
Subject: [LML] Re: LNC2 Hydraulic Gear Operation Fix


> Randy,
> I have spent too much time trying to analyze your hydraulic "fix".
>
> You say "The ONLY way to approach this work around for the Oildyne pump
> problem is to REMOVE the pressure from the Lo side. Relieving the 
> expanding
> hydraulic fluid and put it back in the reservoir where it belongs!!!!
> This type of "Fix" that simply bypasses the open Lo sensor and does not
> relieve the expanding hydraulic fluid is insane and it's a ticking time 
> bomb
> for gear failure!!!"
>
> In fact, it appears to me that your circuit DOES bypass the open low
> pressure switch, which starts
> the pump and ADDS pressure to the low side.
> Then, when the high pressure switch drops out, it immediately reverses the
> pump to restore the up pressure.
>
> If this analysis is incorrect, please let the group know.
>
> Bob Belshe EE '61
> Lancair 235/320 900+ hours
>
> PS:  Why do you think so many Lancairs, including mine, have never
> experienced this problem?
>
>
> -----Original Message-----
> From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of 
> Randy
> Sent: Monday, October 19, 2009 10:38 AM
> To: lml@lancaironline.net
> Subject: [LML] Re: LNC2 Hydraulic Gear Operation Fix
>
> This looks like a relay that when it senses the Hi pressure switch being
> open, while the gear is up, shorts and closes the Lo pressure circuit. 
> This
> will bypass the Lo pressure sensor when the sensor opens from the 
> hydraulic
> fluid expanding. This type of fix does not stop the hydraulic fluid from
> expanding more and more as it heats up. The hydraulic fluid expansion can
> damage the hydraulic system. I have monitored this problem and have seen 
> the
> Lo side exceed 2000 psi during this heat expansion in the summer months.
> If this relay sticks the Lo sensor circuit will be on all the time
> regardless of the pressure sensor.
> The ONLY way to approach this work around for the Oildyne pump problem is 
> to
> REMOVE the pressure from the Lo side. Relieving the expanding hydraulic
> fluid and put it back in the reservoir where it belongs!!!!
> This type of "Fix" that simply bypasses the open Lo sensor and does not
> relieve the expanding hydraulic fluid is insane and it's a ticking time 
> bomb
> for gear failure!!!
>
> Randy Stuart
> LNC-2
>
>
>
> --
> For archives and unsub 
> http://mail.lancaironline.net:81/lists/lml/List.html
>