TM 1-1510-224-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
(1)
Tuning knobs (NAV control unit) -
Select a VOR frequency.
(2)
VOR/localizer pushbutton selector
switch (display controller) - Select
VOR 1 or VOR 2.
(3)
Single
needle
bearing
pointer
source
selector
switch
(display
controller) - VOR 1.
(4)
Double
needle
bearing
pointer
source
selector
switch
(display
controller) - VOR 2.
(5)
Course knob (EHSI) - Rotate until
pointer indicates 0 degrees.
(6)
TEST switch (NAV control unit) -
Depress.
(7)
NAV flag on the EHSI - Will come
into view. After two seconds, the
flag will go out of view, the EHSI
course deviation bar will center, and
a TO indication will appear. The
bearing pointers will indicate a 0
degree magnetic bearing. The VIR-
32 will return to normal after 15
seconds.
(8)
Check the three marker indications
on the EHSI and listen for a 30 Hz
tone on the audio channel of the
NAV system.
(b)
ILS self test (NAV 1 and NAV 2):
2-25
