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Why Is It Tilted?  
User currently offlineAv8 From United States of America, joined Nov 2001, 37 posts, RR: 0
Posted (12 years 5 months 2 weeks ago) and read 1067 times:

I've noticed that in a lot of the pic's of cockpits, if nothing's running, the attitude indicatior is tilted. Why is this?

5 replies: All unread, jump to last
 
User currently offlineTurbineBeaver From United States of America, joined Jan 2002, 1199 posts, RR: 0
Reply 1, posted (12 years 5 months 2 weeks ago) and read 1018 times:

The Attitude indicator runs on a gyro system, which works by the suction of a vacuum. If nothing is running, the vacuum is off, and the gyro stops spinning so the Attitude Indicator won't work.

TB


User currently offlineTWAL1011 From United States of America, joined Nov 2003, 204 posts, RR: 1
Reply 2, posted (12 years 5 months 1 week 6 days 22 hours ago) and read 979 times:

Interesting...I always thought gyros were electrical. If they're vacuum, how do they work without an engine running?

User currently offlineTWAL1011 From United States of America, joined Nov 2003, 204 posts, RR: 1
Reply 3, posted (12 years 5 months 1 week 6 days 22 hours ago) and read 970 times:

Okay, I'll be the first to admit when I'm wrong...

Note to self: Research and then post. Not the other way around.

Anyway, here's a detailed explanation:

http://www.avweb.com/articles/attitude.html

Sorry!


User currently offlineThirtyEcho From United States of America, joined Dec 2001, 1644 posts, RR: 1
Reply 4, posted (12 years 5 months 1 week 6 days 21 hours ago) and read 945 times:

Gyros are either electrical or vacuum; to provide redundancy, one gyro is electric and the other vacuum. Its a whole other thing in a glass cockpit, though.

User currently offlineTurbineBeaver From United States of America, joined Jan 2002, 1199 posts, RR: 0
Reply 5, posted (12 years 5 months 1 week 6 days 19 hours ago) and read 896 times:

TWAL1011...that's the whole point, your DG (Directional Gyro) and your Attitude Indicator are vacuum run, so when you loose your engine, you lose your vacuum, and lose your attitude indicator and DG.


Click for large version
Click here for full size photo!

Photo © Mike Elliott



(see in the pic, it says VACUUM on the DG and Attitude Indicator)

TB


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