Avionics Flight Checks.

TM 55-1510-218-MTF

H. Avionics Flight Checks.

PROCEDURE

TROUBLESHOOTING

REFERENCE

* 1.

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-

218-10.

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.

4-10