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 TM 1-1510-223-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
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 source annunciator on
respective HSI.
(6) Check the operational status and
accuracy of the VOR receivers by
one of the following methods:
(a)
A VOT (VOR test facility).
Maximum
permissible
bearing error is 4
.
(b)
A radiated test signal from an
appropriately rated repair
station.
Maximum
permissible bearing error is
4
.
(c)
A certified airborne check
point. Maximum permissible
bearing error is 6
.
4-17
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