Learjet 60 - ATC Transponders; Automatic Direction Finding (ADF); Distance Measuring Equipment (DME)

Pilot's
Manual

Learjet 60
DISTANCE MEASURING
EQUIPMENT (DME)
Dual DME
transceivers are installed to
provide distance, time-to-
station, ground
speed, and station ident information
for use by other
units in the avionics system
. Each DME can track as
many as three
stations at the same time .
Channel 1 of each DME
is paired with a
VOR frequency and tuned
via the RTU or CDU for
direct display by
the crew . Channels
2 and 3 are used by the
Flight Management Sys-
tem for multisensor
navigation and are
automatically tuned by the
FMS . DME Hold
can be activated on the
RTU to "hold" the current
DME frequency
and allow the navigation
receiver to be independent-
ly retuned . 28
VDC power for the
DME receivers is supplied by the 3-
amp
DME 1 and DME 2 circuit
breakers on the pilot's and copilot's
circuit breaker panels .
AUTOMATIC DIRECTION
FINDING (ADF)
An ADF system is
installed to provide aural reception
of signals from
a selected ground
station and indicate relative
bearing to that station .
The system
operates in the normal ADF
frequency range and is tuned
via the RTU or CDU
for direct display by the crew
. Functions such as
BFO ON or
OFF are controlled by the RTU . The
2-amp ADF 1 circuit
breaker is
located on the pilot's circuit breaker panel to supply
28
VDC to
the ADF receiver . ADF 1 will be
operative during EMER BUS
operations .
ATC TRANSPONDERS
' Dual transponders (Mode C or Mode S) are installed to provide
iden-
tification and altitude reporting for the air traffic control radar beacon
system
. The transponders provide selectable altitude reporting and
4096
code selections . Code selection may be accomplished from the
RTU or CDU .
Other functions such as the selection of STBY mode, ID
(ident) and
turning off and on altitude reporting are controlled by the
RTU
.
Power for the transponders is 28 VDC supplied by the 3-amp
ATC 1 and ATC 2 circuit
breakers on the pilot's and copilot's circuit
breaker panels . Identification and altitude reporting will be
provided
I by ATC 1 during EMER BUS operations . Mode S transponders are re-
quired if TCAS is installed .
5-50
PM-123
Change 2