Diamond DA40 NG — Other Documents

This document is an AAIB Bulletin detailing an accident involving the Diamond DA40 NG aircraft, registration G-LDGB, which occurred during a training flight on May 16, 2023. The report outlines the circumstances of the incident, where the rear passenger door detached from the aircraft mid-flight due to an inadvertent disengagement of the primary locking mechanism by the instructor. The bulletin includes a thorough investigation into the incident, findings regarding the door's design and operation, and safety actions taken by the operator following the event. It serves as a critical reference for pilots and operators to understand the risks associated with door operation and the importance of pre-flight checks.

• The rear passenger door of the Diamond DA40 NG can detach if the primary locking mechanism is disengaged during flight.
• Pre-flight checks must confirm that the rear door is securely closed and locked to prevent in-flight separation.
• The aircraft's design allows for the door to separate cleanly to avoid damage and maintain controllability.
• The operator has revised safety protocols and checklists following the incident to enhance safety measures.
• The incident underscores the importance of crew training regarding door operation and warning systems.