TM 55-1510-220-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
a.
NAV A control (audio control panel) - Depress on and rotate clockwise to set volume.
b.
Off/volume control (VOR control panel) - Rotate clock- wise to turn set on, and set volume as
required.
c.
Frequency selectors - Set test frequency.
d.
Course indicator switches (instrument panel) - VOR.
e.
Fly directly toward a VOR station of known direction and near enough to provide a reliable signal.
f.
Rotate course card on course deviation indicators until direction to station is beneath course index.
The VOR/ localizer needle should be nearly centered and the to/ from indicator should read to. The
red glideslope warning flag should be visible but the VOR/localizer warning flag should be
concealed.
g.
Rotate course card until direction to station is beneath reciprocal course index. The VOR/localizer
crosspointer should be centered and the to/ from indicator should read from.
h.
Rotate the course card until the direction to the station is directly below the course in
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