lml@lancaironline.net Mailing List Archive

Hi Bob,

The problem/confusion I encountered was with Advanced Flight Systems technical support. They seemed not to understand that according to my install manual(they did not have a copy that old!) dated January 1999, AOA Pro CPUs with serial #s above 200 have internal diodes to protect both the gear and flap circuits. They kept insisting that the AOA gear circuit could not SHARE a switch with any other system. My CPU went back to them this week for both hardware and software upgrades which are free. I asked them to check that my unit #298 had the proper diodes installed and they confirmed that it did.

So I can connect the AOA gear circuit to the ground lug of one of the gear micro switches and proceed onward and hopefully upward...

I can't imagine that there are Lancair builders(still building) out there who have an AOA unit with a serial # less than 200.

If they do, an external diode would be required.

Angier

N4ZQ

On Aug 27, 2009, at 10:50 AM, Robert Pastusek wrote:

Angier,
I agree with this solution, but if you use it, be sure to put an isolation diode in the ground wire for each circuit (gear light and AOA sensor) before it’s connected to the gear down switch. Alternatively, consider installing a second identical switch “on top of” the existing switch. Just need some longer #4 bolts. I used this solution to operate my A/C cooling fans because I didn’t want any other wiring tied to the gear down circuit. This is probably a false concern, but in any case, either method should work well.

Bob

From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Sky2high@aol.com
Sent: Tuesday, August 25, 2009 11:58 PM
To: lml@lancaironline.net
Subject: [LML] Re: AOA Pro

Yep, Marv is right..............

Grayhawk
Gear down 99 and 44/100ths percent of the time.
In a message dated 8/25/2009 8:49:56 P.M. Central Daylight Time, marv@lancair.net writes:
Posted for "Angier M. Ames" <n4zq@comcast.net>:

Just wondering how builders are grounding pin 9 on the 25 pin Dsub  connector
for a gear down indication on the display.
For example, does anyone know of a double pole version of our  traditional
gear switch?

Angier Ames
N4ZQ

[Seems to me the switches that give you your three greens are already sending grounds for those lights. Assumiing your gear lights operate similarly you could pick up any one of those grounds to trigger your AOA gear down indicator. Check your wirebook.   <Marv>    ]
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