Heading Indicator Flashcards
How does the Heading Indicator work?
The heading Indicator works on the principle of rigidity in space. The rotor turns in a verticle plane, and fixed to the rotor is a compass card. Since the rotor remains rigid in space, the points on the card hold the same position in space relative to the vertical plane.
Note: I must align mine with magnetic compass because it doesnt have an automatic north seeking system built in.
What are the limitations of the heading indicator?
On some heading indicators in light airplanes, the limits are approximately 55° of pitch and 55° of bank. When either of these attitude limits are exceede, the instrument “tumbles” or “spills” and no longer gives the correct indication until it is reset with caging knob. Many modern insttuments used are designed in such a manner that they will not tumble.
What type of error is the Heading Indicator subject to?
Because of precession, caused by friction, the heading indicator will creep or drift from the heading it is set to.
You must align heading Indicator to Magnetic Compass every 15 minutes. Maximum allowable precession is 3° in 15 minutes.
