Term
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Definition
| Take-off rated thrust is the maximum allowable thrust (determined by fan speed, N1). It varies with pressure altitude, ram air temperature, and bleed air usage. Operation of TRT is limited to 5 minutes. |
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Term
| Maximum continuous thrust |
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Definition
| Maximum continuous thrust is the maximum allowable thrust (determined by fan speed, N1) that may be used without a time limitation. Maximum continusous thrust varies with pressure altitude, ram air temperature, and bleed air usage. |
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Term
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Definition
| The runway length minus any unusabe portion of the runway such as the aircraft lineup distance or barriers on or above the runway. |
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Term
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Definition
| Runway length is the paved surface length excluding any overrun. |
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Term
| Critical engine failure speed |
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Definition
| Critical engine failure speed is defined as the speed at which one engine can fail and the same distance is required to either continue to accelerate to lift-off speed, or abort and decelerate to a full stop. |
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Term
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Definition
| The critical field lenth is the total lenth of the runway required to accelerate on all engines to critical engine failure speed, experience an engine failure, then continue to lift-off or stop. It is used during takeoff planning together with the climbout data to determine maximum gross weight for a safe takeoff and climbout. For a safe takeoff, the critical field length must be no greater than the runway available. |
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Term
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Definition
| Take-off factor numbers are %N1 settings adjusted for OAT and altitude and are presented on a different scale. |
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Term
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Definition
| Take-off ground run is defined as the runway distance normally obtained in service operation at zero wind at the mission-specified weight, pressure altitude, thrust setting, ambient temperature, and appropriate take-off configuration using lift-off speed. |
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Term
| Minimum control speed ground (Vmcg) |
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Definition
| Ground minimum control speed, Vmcg (88 KIAS), is the minimum controllable speed during the take-off run, at which, when an engine is failed, it is possible to maintain directional control using only primary aerodynamic controls without deviating more than 25 feet laterally with all three wheels on the runway. The speed is established with the remaining engine at the takeoff thrust setting, the aircraft loaded at the most unfavorable weight and center of gravity, and the aircraft is trimmed for takeoff, without exceeding 180 pounds of rudder control force by the pilot with the rudder boost system operating. Conditions of crosswind and RCR may increase Vmcg. |
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