What is the recommended sequence for increasing power in an aircraft?

The recommended procedure for increasing power in an aircraft is to first increase RPM before increasing manifold pressure. This sequence is critical to ensure engine safety and efficiency. When the RPM is increased first, it allows the engine to maintain a proper combustion process, which is essential for producing power effectively.

Increasing the RPM raises the speed of the engine's propeller, which helps in creating additional thrust. Once the propeller is spinning at a higher RPM, you can then safely increase the manifold pressure, which controls the engine's fuel-air mixture entering the cylinders. This two-step process helps prevent engine stress or knocking that could occur if manifold pressure is increased without first ensuring the engine can handle that power output due to the higher RPM.

This approach is especially important in aircraft with fixed-pitch propellers or in operational conditions where engine efficiency is paramount. By following this sequence, pilots can achieve a smoother and more controlled increase in power, ensuring both safety and performance during engine power applications.