Mailing List lml@lancaironline.net Message #67208
From: Mike Larkin <legacyl2k@gmail.com>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] leaky electrical system
Date: Mon, 30 Sep 2013 12:59:24 -0400
To: <lml@lancaironline.net>
 Message Header

Undecoded Message
Terrence,

 I am always suspect when the "LAST" CB fixes the problem.  Make sure you push all of them back in and retest with just the HYD breaker pulled to verify.  If your proof works then I would look at the relays and the diode installation in the system for proper polarity or a bad relays.  Something that strikes funny, is the HYD CB should be on the far side of the master relay and isolated off when the master is off.  You may have a ground issue.   If that is all good then system wiring is most likely the problem.  If the Lancair wiring schematic was used and followed, (Legacy Manuel off the top of my head) the HYD power CB controls the main landing up/down relays only!  The control CB controls the selection circuit through the down indicator circuit.   Hope this helps.

Mike Larkin




On Sun, Sep 29, 2013 at 7:53 PM, Terrence O'Neill <troneill@charter.net> wrote:
My N211AL is from kit no. 11, and has electric prop, electronic ignition, dual grant rapids Tech EFIS, autopilot, flaps, navcom, GPS, transponder, intercom, and retract gear.

My battery kept going dead, so was advised to put an ammeter on it and see how much it was leaking, and then start pulling circuit breakers.
It was leaking 18.7 milliamps.  I pulled CBs one at a time and reset them.  Would you believe the very last one stopped the leaking, and the ammeter went to 0.0.
It is the CB for the hydraulic pump.

Question:  why is that circuit leaking when the CB is in?
The pump works fine.
I have added a pressure switch to keep the gear down and the airspeed is below about 85 mph ... or to put the gear down when the airspeed drops below 85k. The pump is off when the Master is off.
Is there something in the pump circuit that allows it to bleed?

(For now I'm adding to the Check List for Shutdown:  Hyd. Gear CB  -- out.)

Any suggestions welcomed.

Terrence
N211AL L235/320
About 200 hrs.
--
For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html



--
Mike Larkin
LarkinAviationConsulting
LegacyL2K@gmail.com
602-770-6054
Subscribe (FEED) Subscribe (DIGEST) Subscribe (INDEX) Unsubscribe Mail to Listmaster