How many Altimeter Setting Indicators (ASIs) are required in a terminal facility?

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Multiple Choice

How many Altimeter Setting Indicators (ASIs) are required in a terminal facility?

Explanation:
Redundancy for critical instruments is the concept behind this requirement. In a terminal facility, you need two Altimeter Setting Indicators so there’s a backup if the primary one fails or needs recalibration. This lets the controller continually provide accurate altimeter settings to arriving and departing aircraft and to cross-check readings, which is essential when coordinating traffic in busy terminal airspace. Having two indicators ensures continuity of operations without noticeable interruption, and a single instrument wouldn’t provide that safety net.

Redundancy for critical instruments is the concept behind this requirement. In a terminal facility, you need two Altimeter Setting Indicators so there’s a backup if the primary one fails or needs recalibration. This lets the controller continually provide accurate altimeter settings to arriving and departing aircraft and to cross-check readings, which is essential when coordinating traffic in busy terminal airspace. Having two indicators ensures continuity of operations without noticeable interruption, and a single instrument wouldn’t provide that safety net.

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