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.
