In autoland operations with FLARE arm, when TO/GA is pressed with LNAV arm annunciated on the FMA, when does LNAV engage?

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Multiple Choice

In autoland operations with FLARE arm, when TO/GA is pressed with LNAV arm annunciated on the FMA, when does LNAV engage?

When operating autoland with FLARE arm, the system gates lateral guidance so it only becomes active after a safe altitude has been reached. If LNAV is armed and you press TO/GA, LNAV will engage once the airplane passes 400 ft above the ground. This 400 ft threshold ensures there’s enough height to smoothly capture and follow the programmed lateral path without conflicting with the approach path or flare sequence. Above 400 ft AGL, LNAV takes over and keeps the aircraft on the preplanned lateral track toward the runway. The alternative options aren’t consistent with how the engagement is designed: engaging too early (above 50 ft) could cause unstable guidance, LNAV will not engage at all is incorrect because there is a defined engagement gate, and engaging at touchdown would miss the continuous lateral guidance needed during the approach and flare.

When operating autoland with FLARE arm, the system gates lateral guidance so it only becomes active after a safe altitude has been reached. If LNAV is armed and you press TO/GA, LNAV will engage once the airplane passes 400 ft above the ground. This 400 ft threshold ensures there’s enough height to smoothly capture and follow the programmed lateral path without conflicting with the approach path or flare sequence.

Above 400 ft AGL, LNAV takes over and keeps the aircraft on the preplanned lateral track toward the runway. The alternative options aren’t consistent with how the engagement is designed: engaging too early (above 50 ft) could cause unstable guidance, LNAV will not engage at all is incorrect because there is a defined engagement gate, and engaging at touchdown would miss the continuous lateral guidance needed during the approach and flare.

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