Message-ID: <19981215082935.20336.qmail@www01.netaddress.usa.net>
Date: Tue, 15 Dec 1998 08:29:35
From: Dan Schaefer <dfschaefer@usa.net>
To: lancair.list@olsusa.com
Subject: Hydro power pack wires
Mime-Version: 1.0

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Regarding the discussion on the third wire (the "little black wire") 
emerging frome the hydro pump, I remember vaguely a communication 
from the factory quite a while ago that refutes their earlier 
instructions to cut it off and tape it. I'm sure it described 
that wire as as Oildyne does, i.e., a thermal ground cut-off. If 
I remember right, it opens on over-temp and should be the return for your 
pump-control relay coils. That way, if the pump gets too hot (like from 
running on too long) the thermal protection will turn off the pump relays.

This should be able to be confirmed by the factory. I'm pretty sure I'm 
right and if so, this feature should be hooked up in all our aircraft. But 
memory being what it is, be sure to confirm with Lancair before doing any 
rewiring. It sounds like a very good safety feature and could save the 
pump one day - worth while as they're not cheap! And in my airplane, would 
be a real SOB to even get at to remove!

Fly Safe,

Dan Schaefer
N235SP


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