Which of the following does not provide a proper reason for not using HMD in civil aircraft?(a) No need of helmets in civil aircraft(b) Acoustic noise level in civil aircrafts is much lower(c) Situational awareness is needed in civil aircraft(d) An oxygen mask is required only in the case of cabin depressurizationI got this question in an online interview.This interesting question is from Helmet Mounted Displays in division Displays and Man-Machine Interaction of Avionics

Which of the following does not provide a proper reason for not using

1.	Which of the following does not provide a proper reason for not using HMD in civil aircraft?(a) No need of helmets in civil aircraft(b) Acoustic noise level in civil aircrafts is much lower(c) Situational awareness is needed in civil aircraft(d) An oxygen mask is required only in the case of cabin depressurizationI got this question in an online interview.This interesting question is from Helmet Mounted Displays in division Displays and Man-Machine Interaction of Avionics
Answer» Correct CHOICE is (c) Situational awareness is NEEDED in civil aircraft The explanation is: For a civil aircraft the situational awareness is not essential as they are inherently safer and do not execute high g maneuvers. ALSO, situational awareness is an important factor only when the flight parameters are rapidly changing, for a civil aircraft which is in steady LEVEL flight for most of its flight time situational awareness is not necessary.

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