TM 1-1510-224-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
AVIONICS FLIGHT CHECKS (CONT)
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.
d
Certified check points on an airport
surface. Maximum permissible error
is 4.
e
Comparison of indications of dual
aircraft
VOR
systems.
The
maximum
permissible
variation
between the two indicated bearings
is 4.
(b)
Localizer/glideslope/marker beacon - Check as
follows:
(1)
Marker beacon volume control (pedestal
extension) - Rotate full clockwise.
(2)
NAV A control (pilot’s audio control
panel) - Push on and turn clockwise to
adjust volume.
4-18
