TM 1-1510-224-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
throughout the frequency range of 200 to
1750 KHz.
(c)
Single or double bearing pointer source
selector switch (display controller) - ADF.
Both single and double needle pointers on
both the pilot’s and copilot’s EHSI should be
functionally checked.
(d)
Verify accuracy of ADF indications on pilot’s
and copilot’s EFIS displays over a known
ground reference point approximately every
90 throughout 360.
* 9.
Navigation receivers (VOR/localizer/
K11-12,
glideslope/marker beacon) - Check as follows:
(a)
VOR receivers - Check each VOR receiver
as follows:
(1)
NAV A control (audio control panel) -
Depress on and rotate clockwise to set
volume.
(2)
Power
and
mode
switch
(VHF
navigation receiver control unit) - ON.
(3)
Volume
control
(VHF
navigation
receiver control unit) - As required.
(4)
Tuning knobs - Set test frequency.
(5)
VOR/localizer
pushbutton
selector
switch (display controller) - Depress to
select VOR1 or VOR2 navigation
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