When will the Flight Alerting System (FAS) activate?

The Flight Alerting System (FAS) is specifically designed to monitor critical aircraft parameters and alert pilots of any issues that may compromise flight safety. One of the key functionalities of the FAS is to provide warnings related to the position and status of the landing gear.

The FAS will activate when the landing gear is not down and locked during critical phases of flight, particularly when the aircraft is in a configuration that requires landing gear to be extended, such as during an approach for landing. This is crucial because attempting to land without the landing gear deployed can lead to severe damage to the aircraft and pose significant safety risks to the crew and passengers.

In scenarios such as taxiing, climbing to cruising altitude, or exceeding weight limits, the system is not specifically designed to trigger alerts that fit the definition of activation by the FAS. Each of these other situations is managed by different systems or does not represent an immediate safety threat in the same way that landing gear position does. Hence, the activation of the FAS in relation to the landing gear not being down is a vital safety feature in the aircraft's operational protocols.