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Date: Fri, 08 Aug 2014 07:52:36 -0400
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Subject: Re: [LML] LNC2 Gear Pump
References: <list-7083838@logan.com>
From: Chris Zavatston <chris_zavatson@yahoo.com>
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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 nu=
t.
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 press=
ure 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 m=
inor changes due to altitude/temperature differences.
> The flight on July 11th for example had the gear coming up at 7:21:12am wi=
th the pump shutting off at 1440psi. and slowly dropping to 1080psi at 7500f=
t
> where Bill Harrelson aka Wineaux and I conducted a first GAMI lean exercis=
e. 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 cy=
cles 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.
>=20
> So at this point, there is no evidence of any external fluid leaks. I=E2=80=
=99m thinking there may an internal leak in one of the six actuators, an iss=
ue with the pump itself, or possibly=E2=80=A6.
> a failing high pressure limit switch.
>=20
> Any comments and advice from all you hydraulic wizards is gratefully appre=
ciated.
>=20
> Thanks,
>=20
> Angier Ames
> N4ZQlml
>=20
> This file only contains the last three flights due to the size of the orig=
inal not being accepted on LML.
> The complete file is posted to Lancairtalk.net.
>=20
> <new data.xlsx>
> --
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