Under what condition can an aircraft begin takeoff from a displaced threshold?

For takeoff from a displaced threshold, it is primarily appropriate when taking off in the opposite direction. A displaced threshold marks a point on the runway where the available length for takeoff starts; it is often created to ensure safe landing operations while still allowing for some takeoff capability.

When an aircraft takes off in the opposite direction of the designated landing flow, it may utilize the area beyond the displaced threshold. However, it is essential that pilots also consider the specific runway markings and applicable air traffic control instructions before proceeding, as regulations may vary depending on airport procedures and prevailing aviation rules. This understanding is crucial for safe aircraft operations.

In contrast, taking off while performing a touch-and-go or as instructed by ATC could have specific restrictions or guidance depending on the airport and traffic conditions. Additionally, the idea that displaced thresholds cannot be used for takeoff would not align with established aviation practice, as they can indeed be used when the circumstances are appropriate and safe for flight operations.