H. Avionics Flight Checks.
VLF/omega navigation system
flight test - Perform as follows:
A triangular test flight shall be performed Sastisfacto-
ry performance shall be demonstrated by flying over
three checkpoints whose latitude and longitude are
known, and comparing them with the VLF/omega co-
ordinate readouts. The aircraft shall establish a low
altitude, compatible with aircraft safety and applica-
ble Laws and Codes of Flight which will allow accu-
rate sighting of ground landmarks. An altitude of
1000 feet is recommended whenever possible.
a. VLF/Omega navigation sys-
tem - Set up and operate in
accordance with TM 55-1510-
b. Insert the coordinates of two
distant ground checkpoints
and point of departure. Dis-
tances between pound check--
points should be far enough
apart to provide a 1 hour tri-
angular closed course.
c. Fly the triangular course and
monitor the navigation instru-
ments for proper operation.
*d. Record the distances from the
known ground checkpoints to
the corresponding waypoint
location provided by the
VLF/Omega navigation sys-
tem. Maximum permissible
along-track or cross-track er-
ror for each checkpoint is
1.75 statute miles.