TM 1-1520-240-MTF4-57(10) Set the FLY-TO-DEST thumbwheel toposition “4”.(11) Repeat step (7) for destination CP-4.(12) Repeat step (8) for checkpoint CP-4.b. Navigation Accuracy Test Legs — Thefollowing navigation legs shall be flown inthe indicated numerical sequence.(1) Leg Number 1 — Fly from CP-1 to CP-3at normal cruising speed. Record thedisplayed present position coordinatesat CP-3 flyover.(2) Leg Number 2 — Fly from CP-3 to CP-4at maximum helicopter speed. Recordthe displayed present positioncoordinates at CP-4 flyover.(3) Leg Number 3 — Fly from CP-4 to CP-1at minimum safe speed (greater than 20knots) of the helicopter. Record thedisplayed present position coordinatesat CP-1.c. Maximum cross track error is $5% of thedistance of the leg. Maximum error alongthe track is 2% of the distance of the leg.10. GPS/Doppler Flight Test Procedure.a. Verify proper system operation with MODEswitch to TEST and display line 1 indicatingTEST COMPLETEand line 2 TEST OK.b. Verify proper response of CDU panellighting to aircraft dimmer control andDisplay lighting to CDU BRT control. Adjustto comfortable level.
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