When should you begin outbound timing in a holding pattern?

Beginning outbound timing in a holding pattern should occur when the aircraft is abeam the fix. This is the correct approach because timing in a holding pattern is standardized to ensure uniformity and predictability in operations. The outbound leg is generally considered to start when the aircraft is at a 90-degree angle relative to the inbound course, which is when the aircraft is abeam the holding fix.

This timing method helps pilots maintain the correct spacing and duration of the holding pattern, allowing for efficient management of air traffic, especially during situations where multiple aircraft are holding or waiting to land.

Choosing any of the other options would not align with the established practices of timing in holding patterns. For instance, starting timing upon reaching the holding fix would negate the required outbound timing measurement and potentially lead to inaccuracies in the hold duration. Starting timing when the aircraft is 1 mile past the fix could lead to variations in timing depending on the approach, which is not standard practice. Wings level outbound may also introduce inconsistencies, as the timing should ideally reflect a constant reference point rather than varied headings. Therefore, to accurately adhere to standard operating procedures in a holding pattern, the correct point to begin timing is when you are abeam the fix.