Electric Attitude Indicators

[Sidious]

Do electric attitude indicators have pendulous vanes? If not then how do they correct themselves after precessing? The reason I ask is because I understand Pendulous Vanes to use air from the vacuum system in their operation and minus a vacuum system I cant see how they would work.

Thanks

 

[Holocene]

Do electric attitude indicators have pendulous vanes?

No. The erection mechanism is controlled via magnetic fields.

 

[Sidious]

Source or some type of article? I would like to learn as much about this as possible. Thanks!

 

[JulietBravo]

Try these for more insight:

http://www.avweb.com/news/avionics/183240-1.html

http://www.pennavionics.com/ATTITUDE_INDICTOR_SUBSTITUTIONS.pdf

http://64.13.249.214/images/uploads...de_Indicator_Installation_Manual_4300-2xx.pdf

http://64.13.249.214/images/uploads/4300_Series_Electric_Attitude_Indicator_Pilots_Guide.pdf

 

[Sidious]

Try these for more insight:

Thanks JB. Interesting how one of the articles you posted said:

"Model 4300-202/-203 Electric Attitude Indicators employ an efficient electrically driven internal vertical gyroscope assembly incorporating a special air erection mechanism."​

While another said;

The erection mechanism is also different (it works on the principle of magnetic induction rather than unbalanced airflow), but has the same effect of applying a corrective force at right angles to any gyro tilt, causing the gyro to precess back to plumb.

Anyone else have thoughts on this?

 

[///AMG]

Anyone else have thoughts on this?

I just press the erect button and it makes the magic happen....or at least sometimes it does