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Performance
N/A
9
Aviation
Not Applicable
06/24/2015

Term
 Accelerate-Go Distance
Definition
 The distance required to accelerate on all engines to Critical Engine Failure Speed (VCEF), experience an engine failure at VCEF, and continue the takeoff to rotate at VR and reach VLO.
Term
 Accelerate-Stop distance
Definition
 The distance required to accelerate on all engines to VCEF, experience an engine failure, commence deceleration at V1 and stop the aircraft.
Term
 Climb-Limited Takeoff Weight
Definition
 The maximum weight at which the aircraft can maintain a 2.5 percent climb gradient at V2 with one engine inoperative, flaps at the takeoff position, and the gear retracted.
Term
Definition
 (ΔHeight / ΔHorizontal Distance)*100. For example, 152 feet per nautical mile is a 2.5 percent gradient (152 feet/ 6,076 feet = .025) using 6,076 feet in a nautical mile. Multiplying your groundspeed by this percentage can be used to determine the rate of climb required in feet per minute (e.g. 2.5 X 180 kts=450 ft/min).
Term
 Contaminated Runway
Definition
 Runway contaminants adversely affect takeoff performance by increasing both displacement and impingement drag during acceleration, as well as by decreasing braking coefficient during an aborted takeoff. A runway is considered contaminated when 25 percent or more of the takeoff surface is covered with one or more of the following:   a. Standing water, slush or loose snow greater than 1/8 inch (3mm) in depth. b. Snow of any depth which is compressed into a solid mass. c. Ice of any type.
Term
 Takeoff Surface
Definition
 Runway surface plus any displaced threshold and/or stopway used for takeoff performance calculations. The total takeoff surface used for takeoff planning shall be taken into consideration when determining runway condition.
Term
 Improved Climb
Definition
 An increase in V2 that results in an increased climb gradient or climb limited gross weight for a given flap setting and cg. In addition to a higher V2, V1 and VR are increased accordingly.These speed increases are displayed as speed increase units on the Climb Limited Takeoff Weight tables. A speed increase ‘unit’ is an increase in rotation speed (VR) equal to one percent of the reference stall speed based on reference lift coefficients identified in 737NG flight test. These increases in the takeoff speeds are not equal or proportional in magnitude and vary by aircraft.
Term
 Total Takeoff Distance
Definition
 The horizontal distance required for the aircraft, with the landing gear extended,to reach 50 feet above the height of the airfield surface with an engine failure at VCEF. This distance may exceed the length of the runway or clearway. It is defined to be the sum of the ground run distance plus the airborne distance needed to accelerate and climb to clear the 50 feet height at the Obstacle Clearance Speed (V2).
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