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Item 18. Radio Receiver R-1041/ARN, Marker Beacon
RATINGS
PROCEDURE
GREEN
AMBER
RED
Note: The tests in this chart must be
When aircraft is flown over marker
Marker beacon lamp does
performed with the aircraft in flight
beacon transmitter, marker beacon
not light and no coded
Refer to airways map for location of.
indicator lamp lights and coded
audio is heard in
marker beacon transmitter Set the
audio(400 Hz for outer and1,300 Hz
headsets,
pilot's and copilot's C-1611(*)/AIC for
for middle marker) is heard in the
marker beacon reception and turn on
headsets.
marker beacon control. Fly aircraft
directly over airways marker beacon
transmitter.
Item 19. Direction Finder Set AN/ARN-59(V), Radio Compass
RATINGS
PROCEDURE
GREEN
AMBER
RED
Note: 1. Tests performed at night or
In ANT mode, maximum
Radio compass operates
No reliable adf station signals heard at either
using radio stations too distant may
indication on tuning meter
correctly in COMP mode
position (pilot's or copilot's). ADF indicator
give erroneous results Note: 2. If
occurs when radio set is properly
on one band only. Radio
inoperative in both LOOP and COMP mode.
two AN/ARN-59(V)'s(ADF No. I and
tuned to the same frequency as the
compass operates
One set installed and is inoperative. Two sets
ADF No. 2) are installed, repeat the
station. Undistorted station signal
correctly on all three
installed and both are inoperative.
test below for ADF No. 2 Note: 3. If
of adequate volume is heard in
bands in LOOP mode
only a single (one) AN/ ARN-59(V) is
headset. In COMP mode, direction
only. Direction finding
authorized and it is inoperative, it will
finding indicator gives correct
indicator inoperative in
be given a rating of RED. If dual
relative bearing to the station.
COMP mode. Reliable
(two) AN/ARN-59(V)'s are authorized
Operation of LOOP switch moves
adf station signals heard
and only one is operative, an AMBER
the needle to the left and
at one position only(pilot's
rating will be given If both are
or copilot's).
inoperative, a RED rating. will be
given.
17
Change 1
TM 11-1520-209-ESC

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