When should you begin your outbound timing for a holding pattern?

The outbound timing for a holding pattern should begin over or abeam the fix outbound because this ensures that the timing is accurately measured from the point where the aircraft is established in the hold. The goal is to create a standardized segment of time that corresponds with the expected parameters for the holding pattern, allowing for consistent and predictable navigation.

Initiating timing over or abeam the fix outbound provides a clear reference point for all pilots, which is critical in maintaining procedural consistency and preventing confusion during flight operations. By timing from this specific point, the pilot can monitor and ensure correct adherence to the holding pattern parameters, which include the standard timing of one minute (or the specified duration) for the outbound leg.

Starting the timing as soon as you enter the hold could lead to inconsistent timing, as it does not account for potential delays or variations in entry speed or maneuvering. Similarly, timing upon reaching the last waypoint or when instructed by ATC would either not provide enough consistency or rely too heavily on external commands that may not align precisely with the aircraft's established position within the hold. Thus, beginning timing at the over or abeam position is the most effective and standard method in holding pattern operations.