Multie Engine

What is The Multi-Engine Rate?

The basic differences between operating multi‐engine airplanes and single‐engine:

  • Airplanes that multi‐engine airplanes are:

    • Generally capable of flying at faster airspeeds and higher altitudes, typically larger in size and have more complex systems and more demanding, and that pilots have additional knowledge and understanding of the conditions associated with operating with one engine inoperative.

    While there are a few differences between taxiing single‐engine and multi‐engine airplanes, the most noticeable difference is typically the increase in wingspan. With an increase in wingspan, there is an even greater need for vigilance when taxiing in close quarters. In addition, the multi‐engine airplane may not be as nimble or responsive to steering inputs as the smaller single‐engine airplane.

  • One advantage of a multi‐engine airplane over a single-engine airplane is the differential power capability. Turning the airplane during taxi with the assistance from differential power minimizes the need for brakes during turns and while maintaining the same turning radius.

    Differential power, however, does not need to be used during every turn, or as the primary way to turn the airplane. It is also important to remember to keep engine power to a minimum and not “ride” the brakes. Unless otherwise directed by the AFM/POH, all ground operations should be conducted with the cowl flaps fully open to ensure adequate engine cooling.

    • When operating a multi-engine airplane with one engine inoperative, the penalties for loss of an engine are twofold: performance and control. The most obvious problem related to airplane performance is the loss of power (50%) which reduces climb performance by 80 – 90%, sometimes even more.

    • The second problem affects aircraft control caused by the remaining thrust, which is now asymmetrical. Attention to both of these factors is crucial in maintaining safe one-engine-inoperative flight. 

    For pilots, flying a multi‐engine airplane is an exhilarating yet challenging experience to take full advantage of the airplane’s capabilities, performance, and safety, the pilot must be well‐trained, knowledgeable, and proficient.