Which abbreviation is used for Assigned Altitude in FDIO messages?

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Multiple Choice

Which abbreviation is used for Assigned Altitude in FDIO messages?

Explanation:
FDIO messages use compact field codes for different data. The field that carries vertical information is abbreviated ALT, which stands for altitude. When the controller assigns an altitude to hold on a segment, that value is transmitted in the ALT field as the assigned altitude. The other codes indicate other data: SPD for speed, TIM for time, FIX for a navigation fix, so ALT is the one that represents the assigned altitude.

FDIO messages use compact field codes for different data. The field that carries vertical information is abbreviated ALT, which stands for altitude. When the controller assigns an altitude to hold on a segment, that value is transmitted in the ALT field as the assigned altitude. The other codes indicate other data: SPD for speed, TIM for time, FIX for a navigation fix, so ALT is the one that represents the assigned altitude.

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