the present heading, then the approach mode
will assume a localizer back-course is desired
and the annunciation APPR B/C1 or APPR
B/C2 will appear. This position of the CDI will
also suppress any glideslope indications. If the
course is less than 110 degrees from the pres-
ent heading the approach mode assumes a
normal localizer based approach and the an-
nunciation APPR LOC1 or APPR LOC2 will
appear and the GS will arm and capture nor-
mally (Figure 16-68).
Additionally, this mode will allow the FMS to
accomplish what is called a NAV-to-NAV cap-
ture. When FMS is the current active NAV
source and has been loaded with a localizer-
based procedure (ILS, LOC, LOC BC, LDA,
SDF) the FMS will automatically tune that lo-
calizer and set up a preselected course when
within 30nm of the airport. The preselected
course will appear as a cyan dual line, dashed
CDI on the PFD. This preselected course must
become the active navigation source when on
final for the localizer procedure as it is re-
quired by limitation. This transfer will happen
automatically only if the APPR mode has
been pressed and the preselected course is
trending toward center (Figure 16-69). This is
called NAV-to-NAV capture as the pilot does
not have to manually change navigation
sources or change flight guidance modes. It is
accomplished automatically.
The APPR button is also used when flying a
non-localizer-based approach to a DA (Deci-
sion Altitude). When established on final for
an appropriate RNAV (GPS) approach, the
APPR button will activate the approach mode
(APPR FMS1 or APPR FMS2). When VNAV
is then pressed, it will arm the vertical glide-
path (GP) mode (Figure 16-70). This allows
the FMS to follow a glidepath down to a pub-
lished decision altitude (DA) minimum. This
approach descent is based on barometric alti-
tudes and does not consider a ground based
antenna. Like the ILS glideslope, however, the
GPS GP will disregard any preselected alti-
tudes. Reference the VNAV section of this
chapter for more information.
16-35
FOR TRAINING PURPOSES ONLY
KING AIR C90GTi/C90GTx
PILOT TRAINING MANUAL
16
A
VIONICS
Figure 16-68. APPR Mode Selection
Collins
10
20
APPR B/C1
ALTS
14
000
60
600
700
1
2
4
<
140
80
60
6935
E
1
BRT
DIM
30.16
IN
PRESET
VOR1
FORMAT >
LOC1
109.75
B/C 055
IESJ
0.
8NM
ATC1
UTC
RAT
COM1
COM2
121.800
4336
125.250
14:41
15
o
C
<
1
ET
TERM
V
21
24
w
30
33
N
3
6
E
12
15
S
251
4.
1NM
SXW
RDR
TERR
TCAS OFF
TFC >
<
<
1
Localizer Back Course
Localizer Front Course
Collins
10
20
APPR LOC1
GS
14
000
60
5
4
600
700
1
2
4
<
6935
E
185
180
160
1
DN
1
BRT
DIM
4
30.16
IN
FORMAT >
LOC1
109.75
CRS 235
IEJC
0.
8NM
ATC1
UTC
RAT
COM1
COM2
121.800
4336
125.250
14:41
15
o
C
<
6
ET
V
21
24
w
30
33
N
3
6
E
12
15
S
251
4.
1NM
SXW
RDR
TERR
TCAS OFF
TFC >
<
<
PRESET
FMS1
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