When receiving clearance to back taxi on the runway for takeoff, which way should you turn first?

When receiving clearance to back taxi on the runway for takeoff, you should generally first turn left. This is primarily for safety and procedural reasons.

Turning left allows you to remain aware of your aircraft's position relative to the runway centerline and any potential traffic that may be using or preparing to use the runway. It also positions your aircraft for a more efficient departure once you have completed your back taxi maneuver.

In addition, many airports have standard operating procedures that favor a left turn upon entering a runway, particularly in the absence of specific instructions from air traffic control. This can help in maintaining consistent traffic flow and enhancing overall safety.

Turning in the opposite direction or straight ahead might not optimally position the aircraft for takeoff or could lead to conflicting situations with other aircraft movements. Always consult local procedures and air traffic instructions, as they may vary depending on the airport and specific circumstances.