When is it necessary to give an Expected Further Clearance (EFC) time for a holding pattern?

Providing an Expected Further Clearance (EFC) time is necessary primarily when a delay is anticipated. This practice ensures that the aircraft in a holding pattern has a clear understanding of how long they should expect to remain in that holding pattern before receiving further instructions.

When a delay is expected, issuing an EFC assists the pilot in managing their fuel and preparing for the next phase of their flight. It establishes a level of predictability and aids in maintaining safety by avoiding extended periods of uncertainty for the aircraft. The controller's proactive communication of an EFC allows the pilot to make appropriate decisions regarding altitude adjustments, fuel consumption, and passenger notifications.

While an EFC is beneficial, it is not mandated for every situation, such as when reaching a clearance limit or entering a holding pattern without an anticipated delay. In those cases, the circumstances may not necessitate an EFC, making option A the most appropriate choice.