E-Magair indicator lights

[frankh]

So right now you can swap between 34 and 39 degrees I believe....by jumpering pins 2 and 3

Are you telling me that that EICAD can be set so that you can swap between say 25 and 34 degrees when you switch in the jumpers?

Thanks

Frank

[pczar3]

IMHO, as an engineer who spent many hours doing safety system design, the reason not to have a "dark panel" is in the event of a failure in the LED or driver circuitry. Is it dark because it is okay or because something went west in the driver circuit? Some would argue that a light test circuit would solve that but how often do you check it in flight to assure it is okay? I would opt for a low light level that gets brighter and flashes with a problem. Bright and no flash... problem and a broken flasher, flash but not bright... problem and broken "bright" circuit... you get the idea. The idea with a warning light is that it gets your attention Master Warning etc.

Paul
N694BP - reserved

[N941WR]

Originally Posted by pczar3

IMHO, as an engineer who spent many hours doing safety system design, the reason not to have a "dark panel" is in the event of a failure in the LED or driver circuitry. Is it dark because it is okay or because something went west in the driver circuit? Some would argue that a light test circuit would solve that but how often do you check it in flight to assure it is okay? I would opt for a low light level that gets brighter and flashes with a problem. Bright and no flash... problem and a broken flasher, flash but not bright... problem and broken "bright" circuit... you get the idea. The idea with a warning light is that it gets your attention Master Warning etc.

Paul
N694BP - reserved

Paul,

That sounds like a good idea but isn't that kind of like a backup to the backup system?

Edit: 6/28/07
On the drive in to work this morning I was thinking about this post. This could be a backup to the backup to the backup to the backup, if you are running duel P-mags, as I am.

Here is why. The 2nd ignition is a backup for the first (1), the internal generator is a backup to ship's power (2 & 3), the light (dark or otherwise) is a backup to the operation of the units (4).

I'm sure this could go on but my point is, how much redundancy is required? If I really wanted a lot of redundancy, I would fly a bi-plane.

[penguin]

Originally Posted by frankh

So right now you can swap between 34 and 39 degrees I believe....by jumpering pins 2 and 3

Are you telling me that that EICAD can be set so that you can swap between say 25 and 34 degrees when you switch in the jumpers?

Thanks

Frank

Yes, I believe so. You can't advance beyond 39 deg or retard further than another hard limit (20 deg I think), but EICAD can be used to change the slope of the advance curve. If you put in 25, I think you will have a flat advance curve. But with EICAD you have the ability to set the two curves, to a limited extent. Probably best to call Brad to make sure I am remembering correctly.
Pete