Mode C switch (transponder control panel) - ON.
Contact ground radar facility and request them to give you their altitude readout. Ground facility
altitude readout must agree with aircraft altitude within ±200 feet.
Radar set - Check while airborne as follows:
Turn on procedure: Function switch - TEST (information will appearafter time delay period).
(1) BRT control - As required.
(2) MODE switches - As required.
(3) RANGE switches - 80.
(4) 120/60° degree button - 120°.
(5) TILT control - Move up or down to observe targets above or below aircraft. Echo display will
change in shape and location only. Weather targets will not change shape or location. Ground
targets will not change shape or location. Ground targets are selected as a function of tilt.