Is it allowed to initiate a descent to the next lower altitude immediately after turning from the initial to the intermediate phase on an approach, provided there is positive course guidance?

The key concept in this question revolves around the procedural requirements for descending during an approach. It is crucial to understand that specific regulations govern how and when a descent can be initiated during the various phases of an approach.

During the turn from the initial to the intermediate phase, pilots are typically required to maintain their altitude until they have established stable conditions for descending and are following the appropriate approach procedures. The guidelines are intended to ensure that the aircraft remains safely configured and aligned with the runway, especially considering the potential for unexpected terrain or changes in circumstances that may arise during this transitional phase.

Therefore, initiating a descent immediately upon turning into the intermediate phase, regardless of positive course guidance, is not permitted without adherence to established procedures. The regulations dictate that a secure configuration and alignment with the approach path must be confirmed before any descent can be made. This structured approach helps to mitigate risks associated with altitude changes during critical phases of flight.

In summary, the requirement to hold altitude until fully stabilized and properly configured is why descending immediately after the turn is not allowed, making the correct response to the question "not allowed."