What should you do prior to starting an en route descent?

Before initiating an en route descent, it is critical to thoroughly prepare for safe navigation and approach to the destination. Checking the weather is essential as it informs the flight crew of current conditions, potential hazards, and any alterations needed for the descent and approach based on visibility, wind, or any other weather phenomena.

Coordinating lost communication procedures ensures that all necessary protocols are understood and can be efficiently executed if communication with air traffic control is compromised during descent. This preparation is vital for maintaining safety and preventing misunderstandings regarding altitude changes or approach instructions.

Reviewing the Instrument Approach Procedure (IAP) for the intended final approach is a fundamental part of ensuring that the pilot is familiar with the specifics of the approach path, including any required altitude restrictions, navigation fixes, and the overall configuration for landing. This review enhances situational awareness and allows for more effective planning for the final stages of flight.

Hence, performing all of these actions not only promotes a comprehensive understanding of the flight environment but also reinforces safety measures crucial for a successful descent and approach.