Piper ARCHER III

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(e) Airplane Performance and Flight Planning Terminology

Climb Gradient The demonstrated ratio of the change in

height during a portion of a climb, to the

horizontal distance traversed in the same

time interval.

Demonstrated The demonstrated crosswind velocity is the

Crosswind velocity of the crosswind component for

Velocity which adequate control of the airplane

(Demo. X-Wind) during takeoff and landing was actually

demonstrated during certification tests.

Accelerate-Stop The distance required to accelerate an air-

Distance plane to a specified speed and, assuming

failure of an engine at the instant that speed

is attained, to bring the airplane to a stop.

Route Segment A part of a route. Each end of that part is

identified by: (1) a geographical location;

or (2) a point at which a definite radio fix

can be established.

(f) Weight and Balance Terminology

Reference Datum An imaginary vertical plane from which all

horizontal distances are measured for

balance purposes.

Station A location along the airplane fuselage

usually given in terms of distance from the

reference datum.

Arm The horizontal distance from the reference

datum to the center of gravity (C.G.) of an

item.