How long should you time the 45º straight leg for a category C, D, and E aircraft?

The appropriate duration to time the 45º straight leg for category C, D, and E aircraft is indeed 1 minute and 15 seconds. This specific timing is crucial for ensuring that the aircraft has sufficient time to maintain a stabilized approach in various flight conditions that the specific categories may encounter.

In the context of aircraft operations, particularly during instrument approaches and holding patterns, timing plays an essential role in managing traffic and maintaining safe separation distances. The established durations account for different flight characteristics and performance parameters associated with these aircraft categories, ensuring compliance with operational standards and enhancing safety.

Understanding why this duration is important requires familiarity with the operational guidelines and standard practices in aviation. These practices are based on aircraft dynamics and pilot workload management during critical phases of flight. Being accurate with this timing helps pilots to effectively manage their approach, comply with air traffic control instructions, and maintain safety throughout the operation.