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What are the 5 primary mechanical displays, a Primary Flight Display (PFD) can replace?

(a) Altimeter, turn coordinator, vertical speed indicator, artificial horizon and heading/compass indicator

(b) Altimeter, vertical speed indicator, artificial horizon, heading/compass indicator and Mach meter

(c) Altimeter, vertical speed indicator, artificial horizon, heading/compass indicator and landing gear position

(d) Altimeter, turn coordinator, artificial horizon, heading/compass indicator and Mach meter

I had been asked this question in an online interview.

Asked question is from Head Down Display Technology in portion Displays and Man-Machine Interaction of Avionics

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The correct answer is (b) Altimeter, vertical speed indicator, artificial horizon, heading/compass indicator and Mach meter

To explain: The instruments that are replaced by the PFD are the basic instruments necessary to fly an aircraft. These instruments are altimeter, vertical speed indicator, artificial horizon, heading/compass indicator and Mach meter. All the primary information is shown in the PFD so that the pilot does not have to scan for information.

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