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Subject: Re: LNC2 Gear Pump
From: "Greenbacks, UnLtd." <n4zq@verizon.net>
In-reply-to: <53E414EA.5060205@comporium.net>
Date: Thu, 07 Aug 2014 20:28:21 -0400
Cc: List Lancair Mailing <lml@lancaironline.net>
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 <53E414EA.5060205@comporium.net>
To: John Cooper <snopercod@comporium.net>

Hey, thanks for your response.
Which flight date are you looking at?
Your test gauge offer is much appreciated, does it monitor both HI and =
LO sides or do you switch from one side to the other?
I put 4ZQ up on jacks this morning and raised the gear. HI pressure =
immediately started to bleed off but it was interesting to note
that the gear stayed tucked up nicely until the pressure had dropped to =
310psi. At this pressure, the gear doors had begun to open by about =
.125=94.

Angier Ames

I=92m at 250 Cutler Road
South Hamilton, MA. 01982


On Aug 7, 2014, at 8:08 PM, John Cooper <snopercod@comporium.net> wrote:

> Angier--
>=20
> I'm no "wizard", but In looking at that data, everything seemed to be =
just fine until 9:31:45 when the LO pressure spiked up to 1220 and then =
bled off. A few seconds later, at 9:31:54, apparently you put the gear =
up since the high pressure went up to 1490 then started a slow decay for =
17 minutes until 9:49:12, Whatever happened, it got worse from then on. =
Maybe you can relate those times to anything you might have been doing =
at those times?
>=20
> I don't think it matters, though; I'm guessing you have an internal =
leak somewhere. OTOH, The high-pressure switch kept starting the pump at =
~850 (sounds right to me)  and shutting it off at ~1050 (seems a little =
low). So the pressure switch was doing its job.
>=20
> What happened between 10:58:26 and 10:58:32 when there was little =
pressure on either side? Was the dump valve open for 6 seconds or was =
that just a transition from Gear Down to Gear Up? If the latter, it =
seems kind of long...
>=20
> I'm assuming that your pump is the newer model with the back pressure =
circuit?
>=20
> Bottom line: If I were in your situation, I would isolate the pump and =
check the pressures. I'd be glad to mail you my test gauge if you'd =
like.
>=20
> Best--
>=20
> --John
>=20