TM 1-1510-225-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
VOR 2 navigation source
annunciator on respective
HSI.
(5) Check the operational status
and accuracy of the VOR
receivers by one of the fol-
lowing methods:
a A VOT (VOR test facil-
ity). 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 permis-
sible bearing error is ±6°.
d Certified check points on
an airport surface. Maxi-
mum permissible error is
±40°.
e Comparison of indications
of dual aircraft VOR sys-
tems. The maximum per-
missible variation between
the two indicated bearings
is 4°.
(b) Localizer/glideslope/marker bea-
con - Check as follows:
(1) MKR BCN VOL control
(audio control panel) - Rotate
fully clockwise.
(2) NAV 1 or 2 AUDIO monitor
switch - On. Verify that clear
audio signals are available.
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