What does the approach phase for IFR aircraft begin from?

The approach phase for IFR (Instrument Flight Rules) aircraft begins at the Initial Approach Fix (IAF). The IAF marks the point where an aircraft transitions from en-route flight to the final approach segment, enabling the pilot to safely navigate toward the airport for landing under instrument conditions.

This phase involves various procedures that are critical for ensuring safe and efficient landings. Once the aircraft reaches the IAF, pilots will follow a predetermined path to align with the airport runway, usually guided by navigational aids and specific approach procedures.

Using the IAF as the starting point of the approach phase allows for structured and standardized entry into the approach pathway, which is essential for maintaining safety and organization in busy airspace. The other choices do not align with the established definitions and procedures in IFR operations: the point of VFR pattern entry relates to visual flight rules, 35 feet above ground is too low for the approach phase, and takeoff power application pertains to the departure phase rather than the approach.