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Figure 4-1.  Test Course for Overland Accuracy Doppler
c.   Perform GPS system Start-Up procedure

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 4-57 (10)   Set  the  FLY-TO-DEST  thumbwheel  to position “4”. (11)   Repeat step (7) for destination CP-4. (12)   Repeat step (8) for checkpoint CP-4. b.   Navigation   Accuracy   Test   Legs   —   The following navigation legs shall be flown in the indicated numerical sequence. (1)   Leg Number 1 — Fly from CP-1 to CP-3 at  normal  cruising  speed.  Record  the displayed present position coordinates at CP-3 flyover. (2)   Leg Number 2 — Fly from CP-3 to CP-4 at maximum helicopter speed. Record the displayed present position coordinates at CP-4 flyover. (3)   Leg Number 3 — Fly from CP-4 to CP-1 at minimum safe speed (greater than 20 knots)  of  the  helicopter.  Record  the displayed present position coordinates at CP-1. c.   Maximum cross track error is $5% of the distance  of  the  leg.  Maximum  error  along the track is 2% of the distance of the leg. 10.  GPS/Doppler Flight Test Procedure. a.   Verify proper system operation with MODE switch to TEST and display line 1 indicating TEST COMPLETE and line 2 TEST OK. b.   Verify   proper   response   of   CDU   panel lighting   to   aircraft   dimmer   control   and Display lighting to CDU BRT control. Adjust to comfortable level.







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