Heading indicator

Vacuum systems using a vacuum pump (left) and a venturi (right)

The heading indicator (HI), also known as a directional gyro^[1] (DG) or direction indicator (DI),^[2]^[3]^[4]^[5] is a flight instrument used in an aircraft to inform the pilot of the aircraft's heading.

^ Grumman F11F Tiger Pilot's Flight Operating Instructions. United States Navy. 1 September 2008. p. 51. ISBN 978-1-935327-46-2. Retrieved 17 February 2022.
^ Rotorcraft Flying Handbook FAA-H-8083-21A. Federal Aviation Authority. 2012. p. 12-3.
^ Kjellstrom, Bjorn; Elgin, Carina Kjellstrom (9 December 2009). Be Expert with Map and Compass. John Wiley & Sons. p. 73. ISBN 978-0-470-40765-3. Retrieved 17 February 2022.
^ Cite error: The named reference Bowditch was invoked but never defined (see the help page).
^ "Inside the Cockpit of Amelia Earhart's Vega". airandspace.si.edu. 25 February 2019. Retrieved 17 February 2022.

[1] Grumman F11F Tiger Pilot's Flight Operating Instructions. United States Navy. 1 September 2008. p. 51. ISBN 978-1-935327-46-2. Retrieved 17 February 2022.

[2] Rotorcraft Flying Handbook FAA-H-8083-21A. Federal Aviation Authority. 2012. p. 12-3.

[3] Kjellstrom, Bjorn; Elgin, Carina Kjellstrom (9 December 2009). Be Expert with Map and Compass. John Wiley & Sons. p. 73. ISBN 978-0-470-40765-3. Retrieved 17 February 2022.

[Bowditch-4] Cite error: The named reference Bowditch was invoked but never defined (see the help page).

[5] "Inside the Cockpit of Amelia Earhart's Vega". airandspace.si.edu. 25 February 2019. Retrieved 17 February 2022.

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