annunciation indicating whether it is a MEM-
ORY or a TEMPorary frequency. The memory
functions and direct tuning operate the same
as described under COM Operation, except
the NAV window has an added function called
DME split tuning mode. Its operation is sim-
ilar to the function called DME hold; how-
ever, there are some differences which require
explanation.
Normally, the DME frequency is automati-
cally tuned along with the NAV frequency it is
associated with. However, depressing the DME
function key at the bottom of the RMU allows
the DME frequency to be tuned independent of
the NAV frequency. Depressing the DME key
once causes the NAV window to split into two
sections (Figure 16-10), the top section con-
tains the active VOR frequency and preset,
and the lower section, now labeled “DME,”
contain the active DME frequency in VHF for-
mat. In this condition, the DME may be tuned
directly by simply pressing the line select key
to place the cursor box around the frequency
and re-tuning using the tuning knobs.
During the time that the VOR and DME fre-
quencies are split, the DME digital station
identifier will appear following the DME
nomenclature on the top edge of the DME sec-
tion. Also, when using DME split tuning, an
amber H (hold) appears in front of the DME fre-
quency. This indicates that the distance display
(DME or TACAN) is not paired with the
VOR/ILS navigation data. When the H is dis-
played on the RMU, it will also be displayed
following the DME read-out on the PFD.
Depressing the DME key a second time will
cause the DME window to change from a VHF
frequency presentation to a TACAN channel
presentation with W, X, Y and Z channeliza-
tion nomenclature. This mode of operation
allows access by the DME to all 126 TACAN
channel in all W, X, Y and Z operating modes.
With the cursor over the TACAN display the
operating channel can be changed by rotating
the tuning knobs.
L E A R J E T 4 5
P I L O T T R A I N I N G M A N U A L
16-17
FOR TRAINING PURPOSES ONLY
FlightSafety
international
Honeywell
TUNE
SQ
DIM
1/2
STO
DME
TST
PGE
ID
109.35
NAV 1
MEMORIES
FMS
ENABLED
1
110.30
2
115.60
3
116.50
4
108.70
5
111.80
6
108.40
MORE
INSERT
RADIOS
DELETE
Honeywell
TUNE
SQ
DIM
1/2
STO
DME
TST
PGE
ID
COM 1
123.20
NARROW
SQ
MEMORIES
BANDWIDTH
SELECT
1
136.92
2
122.20
3
131.27
4
125.07
5
121.02
6
118.17
MORE
INSERT
RADIOS
DELETE
Figure 16-11. COM and NAV Memory Pages on RMU