What information must be included in logbook entries for flight instruction given?

The correct choice highlights essential information that must be documented in logbook entries for flight instruction. Specifically, the requirement for a description of the training provided, the length of the instruction, the instructor's signature, and the certificate number serves several important purposes.

Including a detailed description of the training helps ensure that both the instructor and student have a clear record of the subjects covered during the lesson. This documentation is crucial for tracking progress and for future reference, especially when preparing for tests or advanced training.

The length of the instruction is significant for both regulatory compliance and calculating total flight training time, which is important for meeting minimum hour requirements for various certifications.

The instructor’s signature serves as a verification of the legitimacy of the training that took place, signifying that the instructor who is providing the training is appropriately certificated and attesting to the validity of the logbook entry. It establishes accountability and integrity in record-keeping.

Finally, including the instructor's certificate number allows for easy verification of the instructor’s qualifications, which is necessary for students looking to validate their flight training experience.

In sum, these components form a comprehensive record of the flight instruction provided, which is critical for meeting regulatory requirements and ensuring a solid foundation of training history.