Mailing List lml@lancaironline.net Message #70520
From: Chris Zavatston <chris_zavatson@yahoo.com>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] LNC2 Gear Pump
Date: Fri, 08 Aug 2014 07:52:36 -0400
To: <lml@lancaironline.net>
Angier,
It looks like it is time to start isolating circuits and then actuators.  If it is a cylinder, don't forget about the sealing washer under the piston nut.
Chris

Sent from my spiffy iPhone

On Aug 7, 2014, at 4:07 PM, "Greenbacks, UnLtd." <n4zq@verizon.net> wrote:

> Hey guys, I have attached an excel spreadsheet showing the hydraulic pressure data for nine flights from March 5, 2013 through August 6, 2014.
> The data for the first 6 flights seem fairly typical, and I would expect minor changes due to altitude/temperature differences.
> The flight on July 11th for example had the gear coming up at 7:21:12am with the pump shutting off at 1440psi. and slowly dropping to 1080psi at 7500ft
> where Bill Harrelson aka Wineaux and I conducted a first GAMI lean exercise. Not sure why some residual pressure seems to remain on the low side.
> Perhaps one of you can shed light on this.
> The first indication of any irregularity occurred on the 7/31 flight at 9:49:09am when the pressure had dropped to 850 and the pump came on. The on cycles were momentary
> for the remainder of the flight but came with greater frequency.
> For the last flight on 8/6, the gear came up with the pump shutting off at 1470psi and I climbed to 2500ft, pressure immediately began to drop and the pump cycled again at 860psi
> and the recycle events came with greater frequency.
>
> So at this point, there is no evidence of any external fluid leaks. I’m thinking there may an internal leak in one of the six actuators, an issue with the pump itself, or possibly….
> a failing high pressure limit switch.
>
> Any comments and advice from all you hydraulic wizards is gratefully appreciated.
>
> Thanks,
>
> Angier Ames
> N4ZQlml
>
> This file only contains the last three flights due to the size of the original not being accepted on LML.
> The complete file is posted to Lancairtalk.net.
>
> <new data.xlsx>
> --
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