For safe aircraft operation, what fuel quantity must not drop below during emergencies?

The correct answer is based on the minimum fuel quantity requirement to ensure safety during emergency situations. In the context of the T-6A, the minimum fuel quantity that must not drop below during emergencies is 100 pounds. This amount is determined to provide sufficient reserve for safe operation, allow for unexpected circumstances such as a need for go-arounds or other precautionary actions, and to reach the nearest suitable airport in a safe manner.

Having at least 100 pounds of fuel remaining helps mitigate the risk of engine flameout or fuel starvation scenarios, which can occur if the fuel levels are too low, especially during critical phases of flight. This requirement reflects a balance between the need for adequate fuel and the operational constraints of the aircraft.

Other options, such as 50, 75, and 150 pounds, do not comply with the established safety margins defined in the T-6A operating procedures. Maintaining fuel above the minimum requirement ensures that pilots have enough operational flexibility to handle emergencies effectively.