M. NAVIGATION SYSTEMS CHECK

TM-1-1520-238-MTF Maintenance Test Flight Manual Helicopter Attack
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TM 1-1520-238-MTF 4-21 Change 3 13. If the HARS fails the second test, the HARS unit is faulty. M. NAVIGATION SYSTEMS CHECK. NOTE The navigation course used during this check must consist of three waypoints, each at least 20 kilometers from the other two. A triangular course will minimize flight time required to complete flight data recording portion of this check. Accurate waypoint coordinates and magnetic vari- ation data is required. Some aircraft have a fully integrated navi- gation system (EGI) installed; others will have a non-integrated navigation system. If EGI is installed, perform step 1.a. If EGI is not installed, perform step 1.b. 1. Before Flight Checks. a. EGI – Program Navigation course data. b. Doppler – Program navigation course data. NOTE Waypoint 1 – The departure and termination point should be stored in memory locations H, PP, 3, and 6. Waypoint 2 – The first FLY-TO destination should be programmed in memory location 1 and 5. Waypoint 3 – The second FLY-TO destina- tion should be programmed in memory loca- tions 2 and 4. c. HARS mode switch – NORM.

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