Correcting Heading Indicator but not ADI???
Thread Starter
Joined: Dec 2003
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From: ASIA
Correcting Heading Indicator but not ADI???
Hi there!
as we all know you need to correct the indication of the heading indicator every 10 to 15 minutes. I understand that one, but why is there no need to adjust the Attitude Directional Indicator??
as we all know you need to correct the indication of the heading indicator every 10 to 15 minutes. I understand that one, but why is there no need to adjust the Attitude Directional Indicator??
Joined: Feb 2002
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From: oxford
Because it adjusts itself. The gyro of the ADI, or Artificial Horizon as it is otherwise known, would topple over a period of time if it were not kept vertical to gravity.
In an air-driven AH, this is achieved by having a bottom-heavy gyro housing and by a system of air jets with doors which respond to gravity.
In the electric AH, it is achieved using mercury gravity switches and torque motors.
In an air-driven AH, this is achieved by having a bottom-heavy gyro housing and by a system of air jets with doors which respond to gravity.
In the electric AH, it is achieved using mercury gravity switches and torque motors.
Joined: Mar 2002
Aviation Qualifications: CPL
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From: near an aeroplane
There is a bit of info on these instruments here: http://www.av8n.com/how/htm/motion.h...ro-instruments
Don't know it this helps with your question, the text is pretty technical. You'd better look for a book that has some diagrams showing the internals, that might better explain the principles!
Don't know it this helps with your question, the text is pretty technical. You'd better look for a book that has some diagrams showing the internals, that might better explain the principles!
