This service can be divided into route drift down program design and route drift down program verification.

The design aims to provide customers with route drift down procedures. After an engine suddenly stopped during flight, the aircraft dropped from its original cruising altitude to a lower altitude due to reduced thrust. In order to ensure safety, it is necessary to check whether the cruising altitude during the lowering and after leveling can pass through obstacles below the route. Operate on the corresponding scale map to determine two key points on the route "non-return point and continuation point" to determine whether it is necessary to reduce the takeoff weight or set up a new transition procedure.
Airway drift down program verification is to assist customers in completing the simulator or real machine verification of the program according to customer needs and based on program design content.