At what altitude is the airstart procedure not recommended during engine failure procedures?

The airstart procedure is typically not recommended below 2000 feet AGL (Above Ground Level) due to several critical safety and operational factors. At lower altitudes, pilots have considerably less time to react to an engine failure and execute the airstart procedure successfully. The aircraft may not have sufficient altitude to allow for a safe recovery or landing in the event that the airstart attempt is unsuccessful.

Additionally, below this altitude, the margin for error is significantly reduced, and pilots face increased risks associated with the limited options for safe maneuvering or landing. In contrast, situations above 2000 feet AGL provide more time for decision-making and increase the likelihood of successfully restarting the engine or finding a safe landing area.

Other options such as at sea level, above 3000 feet AGL, or below 1500 feet AGL do not represent the same critical thresholds regarding the operational safety and efficacy of the airstart procedure as the lower threshold of 2000 feet AGL. Thus, the choice emphasizing below 2000 feet AGL efficiently captures the operational limits regarding engine failure responses in flight.