When is T.O. INHIBIT active?

T.O. INHIBIT is a function designed to suppress non-essential alerting and caution messages that could distract the crew during critical phases of flight, particularly right after takeoff. The correct answer indicates that T.O. INHIBIT is active from the moment takeoff power is applied until either the aircraft reaches an altitude of 1500 feet above ground level (AGL) or for a duration of two minutes after takeoff, whichever occurs first.

This timing is important because it allows pilots to focus on the immediate demands of the flight, such as maintaining speed and altitude, as well as ensuring proper climb-out procedures. During this critical phase, avoiding unnecessary distractions is vital for safety and effective operation.

The other choices provided do not adequately represent the predefined limits of when T.O. INHIBIT is active. For instance, extending the duration to 3000 feet AGL or three minutes after takeoff could lead to confusion and potentially increased cockpit workload during the critical moments immediately after takeoff. Similarly, options related to engine start and slat extension do not apply, as T.O. INHIBIT is specifically linked to the takeoff phase and not to preliminary or preparatory actions.