What is the maximum operation altitude for single engine taxi?

The maximum operational altitude for single-engine taxi is specified at 20,000 feet. This limitation ensures that the aircraft can maintain adequate performance and safety when operating under such conditions. Operating above this altitude would present significant challenges in terms of maintaining control and performance with only one engine, particularly in terms of the reduced air density and the corresponding loss of thrust.

Flying at higher altitudes reduces the overall engine efficiency and could affect the aircraft’s ability to generate enough thrust to maneuver safely on the ground, which is critical during taxi operations where precise handling is required. In addition, the performance of systems depending on engine operation may also be adversely affected due to the reduced atmospheric pressure at higher elevations. Therefore, this limitation is put in place to maximize safety and operational integrity during single-engine taxi operations.