What happens if all engine oil dumps out of the reduction gear box on the T-54A?

In the context of the T-54A and its operation, if all the engine oil were to dump out of the reduction gear box, the most pertinent outcome relates to the propeller's function. When the reduction gearbox loses its oil, it can lead to a situation where the propeller blades are no longer properly controlled. Specifically, the propeller will feather. Feathering the prop means adjusting the blades to a more aerodynamic position, reducing drag and thereby minimizing the potential for engine damage or loss during a failure which typically occurs to maintain control of the aircraft.

Feathering serves as a safety maneuver, allowing the aircraft to continue flying, albeit with reduced power, while also preventing further complications such as engine overheating or mechanical failure in the absence of adequate lubrication. This situation underscores the critical importance of oil lubrication in maintaining both engine and gearbox integrity.