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How should pilot set the aircraft during a departure?

a)When approaching the aerodrome of intended landing the altimeter shall be set to the current aerodrome altimeter setting, if available.
b) During flight the altimeter shall be set to the current altimeter setting of the nearest station along the route of flight or, where such stations are separated by more than 150 NM, the nearest station to the route of flight.
c) Prior to takeoff, the pilot shall set the aircraft altimeter to the current altimeter setting of that aerodrome or, if that altimeter setting is not available, to the elevation of the aerodrome.

User Till Ulen
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Final answer:

Before takeoff, the pilot must set the altimeter to the departure aerodrome's current setting, or to its elevation if the setting is not available, to maintain required separation distances between aircraft.

Step-by-step explanation:

During the departure of an aircraft, it is crucial for the pilot to set the aircraft's altimeter properly to ensure both the safety of the flight and compliance with air traffic control requirements. Prior to takeoff, according to best practices and regulations, the pilot should set the aircraft's altimeter to the current altimeter setting of the aerodrome from which the aircraft is departing. If this setting isn't available, the alternative is to set the altimeter to the elevation of the aerodrome. Setting the altimeter accurately is essential because it determines the aircraft's altitude relative to sea level, which is necessary for maintaining vertical separation standards. These standards mandate a minimum distance between aircraft flying at the same altitude or in vertical proximity to each other, which is typically five miles horizontally and 2,000 feet vertically for safety reasons. This is comparable to quantum mechanics where electrons have restricted positions, much like aircraft have specific altitudes and paths they must adhere to.