From: RWolf99@aol.com
Message-ID: <5a.1685754f.284ab6c7@aol.com>
Date: Sat, 2 Jun 2001 17:38:15 EDT
Subject: Re: hydraulic pump circuit breaker LNC2
To: lancair.list@olsusa.com
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Reply-To: lancair.list@olsusa.com

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In a message dated 06/02/2001 1:05:03 AM Eastern Daylight Time, 
lancair.list@olsusa.com writes:

<< OK I was tired that night and typed breaker point where I should have
 typed RELAY point. The whole point (pun?) was that you should have some way
 to kill that pump motor if it runs away or are just testing the emergency
 dump. >>

I apologize if I seemed too snappish.  Yes, you're absolutely right, and 
there have been numerous reports of relay failures in this forum already 
(though most have been fail-to-operate, rather than fail-to-shut-off, I 
think).  The ways to minimize these relay failures have been noted as well -- 
Bosch relays, continuous-duty relays, zener diodes, other diodes, etc, and I 
won't list them here.

I understood that the pump should be turned off during the monthly alternate 
gear  extension test.  The manual suggests pulling the relay circuit breaker 
(to keep the pump from turning on), but not pulling the pump breaker, and 
then dumping hydraulic pressure using the manual dump valve.  I never 
understood this.  I had planned on pulling my single circuit breaker, cutting 
power to both the pump and the relays, and then opening the dump valve.

I'd appreciate any comments on this proposed test procedure.  If I've missed 
something important I'd like to know.

By the way, I learned a while ago that I should not send work-related e-mails 
after 5 pm.  I'm too tired and I ended up pissing people off needlessly with 
quick responses.  I haven't followed that rule in this forum since I get my 
digests late in the evening and usually respond right away.  Too bad, since 
as a general rule I value the respect of my fellow Lancair builders more than 
that of my employers.  (Maybe I need a new job...)

- Rob Wolf
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