How early should crews plan to finish their formal brief before the first scheduled flying brief time?

The correct answer indicates that crews should aim to complete their formal brief 15 minutes before the first scheduled flying brief time. This timeframe allows for adequate preparation and ensures that all team members are well-informed and ready for the upcoming flight activities.

Completing the formal brief 15 minutes in advance provides a buffer period, which can be essential for addressing any last-minute questions or clarifications that may arise. It also gives crew members time to gather their thoughts, make necessary adjustments, or check equipment before the flying brief begins. This practice emphasizes the importance of thorough preparation and effective communication within the crew, contributing to overall safety and operational efficiency during flight operations.