What unit is used by the Standby Pressure Altimeter to display barometric pressure?

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Study for the EAWS Phase III Boeing EA-18G Growler Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready to ace your exam!

Multiple Choice

What unit is used by the Standby Pressure Altimeter to display barometric pressure?

Explanation:
The Standby Pressure Altimeter uses inches of mercury because aviation pressure instruments have historically been calibrated and read in that unit. The aneroid mechanism inside is designed to respond to atmospheric pressure in inHg, and cockpit conventions tie altimeter settings and readings to this unit (with 29.92 inHg commonly used as the standard sea-level reference). This makes the instrument's scale intuitive for pilots and consistent with flight planning and air traffic procedures. Kilopascals, millibars (hectopascals), or psi aren’t the standard display units on this standby instrument, so inches of mercury is the best choice.

The Standby Pressure Altimeter uses inches of mercury because aviation pressure instruments have historically been calibrated and read in that unit. The aneroid mechanism inside is designed to respond to atmospheric pressure in inHg, and cockpit conventions tie altimeter settings and readings to this unit (with 29.92 inHg commonly used as the standard sea-level reference). This makes the instrument's scale intuitive for pilots and consistent with flight planning and air traffic procedures. Kilopascals, millibars (hectopascals), or psi aren’t the standard display units on this standby instrument, so inches of mercury is the best choice.

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