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”.

Angier Ames

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


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

> Angier--
>
> 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?
>
> 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.
>
> 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...
>
> I'm assuming that your pump is the newer model with the back pressure circuit?
>
> 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.
>
> Best--
>
> --John
>