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

The airstart procedure is typically not recommended below 2000 feet Above Ground Level (AGL) during an engine failure due to safety and operational considerations. At altitudes below this threshold, a pilot has significantly less time and altitude to troubleshoot the situation and execute a safe recovery, which increases the risk of an emergency.

At higher altitudes, a pilot has more options and time to manage the situation, including the potential for performing emergency procedures that could lead to a successful engine restart or planning for a controlled landing. When operating below 2000 feet AGL, time is critically limited, which places significant demands on decision-making and increases the chance of an incident occurring if the engine does not restart.

Thus, the 2000 feet AGL threshold serves as a guideline that helps ensure that pilots have the greatest chance of successfully managing an engine failure scenario. This approach acknowledges that safety is paramount and emphasizes the need for adequate altitude to mitigate risks associated with engine failure.