A controller needs to inform an aircraft currently flying at a high altitude regarding a lower altitude assignment. What should they say?

The appropriate approach for informing an aircraft currently at a high altitude to descend to a lower altitude is to provide clear and unambiguous instructions. Saying "Descend and maintain new altitude" effectively conveys both the action the pilot must take (to descend) and the specific altitude they need to maintain once they have descended.

This instruction informs the pilot that they are not only to drop down to a specified altitude but also to hold that altitude once they reach it. It is critical for safety and operational efficiency that the instructions are clear and concise, ensuring that the pilot understands the need to stabilize at the new altitude after descending.

In this context, clarity and specificity are paramount for effective communication among air traffic control and pilots, which enhances safety during altitude changes.