If LNAV was armed before takeoff, under what conditions does LNAV guidance become active?

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Multiple Choice

If LNAV was armed before takeoff, under what conditions does LNAV guidance become active?

When LNAV is armed before takeoff, it won’t start guiding you along the programmed path right away. It waits until you’re in a position where you can reliably capture the lateral track. Specifically, LNAV becomes active at 50 feet AGL if the active leg of the flight plan is within 3.0 nautical miles and the aircraft’s heading is within 5 degrees of the runway heading. This ensures a stable, clean transition from takeoff to following the planned lateral path. Why this timing and these tolerances make sense? They ensure you’re aligned with the runway plan before the system starts steering you, reducing the risk of following a leg that isn’t properly aligned or is too far off track. Activating at liftoff or much later would either be premature or could lead to misalignment, while this condition provides a safe, predictable handoff to LNAV guidance.

When LNAV is armed before takeoff, it won’t start guiding you along the programmed path right away. It waits until you’re in a position where you can reliably capture the lateral track. Specifically, LNAV becomes active at 50 feet AGL if the active leg of the flight plan is within 3.0 nautical miles and the aircraft’s heading is within 5 degrees of the runway heading. This ensures a stable, clean transition from takeoff to following the planned lateral path.

Why this timing and these tolerances make sense? They ensure you’re aligned with the runway plan before the system starts steering you, reducing the risk of following a leg that isn’t properly aligned or is too far off track. Activating at liftoff or much later would either be premature or could lead to misalignment, while this condition provides a safe, predictable handoff to LNAV guidance.

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