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5-37
Rev 1
5.9.6 Going Direct-To A Waypoint While in the OBS
Mode
The direct-to function will select the OBS value that will
take the aircraft from the present position direct to the
active waypoint when the KLN 90B is interfaced to
EFIS, a compatible mechanical HSI interfaced through a
KA 90, or when the KLN 90B is not the displayed navi-
gation source on the external indicator.
If the KLN 90B is the displayed navigation source on a
non-driven HSI or a CDI it is not possible for the KLN
90B to change the OBS value. In these situations the
KLN 90B will provide a scratch-pad message that will
tell you what OBS value should be selected to go direct
to the active waypoint (figure 5-115).
5.9.7 Activating A Waypoint While In The OBS Mode
While in the OBS mode, you may activate another way-
point by using the normal Direct To method or by using
a second method. This second method activates
another waypoint without changing the selected course
(OBS). In other words, when the new waypoint is acti-
vated, the D-Bar is not recentered. In figure 5-116 the
KLN 90B is in the OBS mode and the selected course is
90°. You have just crossed INITT intersection and
desire to activate the next waypoint in the flight plan,
FINAL, without recentering the D-Bar.
1.PressD(figure 5-117). The rules described in
section 3.8, “DIRECT TO OPERATION”, dictate
which waypoint identifier will be initially displayed on
the Direct To page.
2.Press Da second time. The annunciation
DIRECT TO changes to ACTIVATE(figure 5-118).
The right side still displays the appropriate waypoint
page. Repeated presses of Dalternates between
DIRECT TOand ACTIVATE. Make sure ACTIVATE
is displayed.
3.Press Eto approve the waypoint page and acti-
vate the waypoint (figure 5-119). The selected
course does not change, therefore this method does
not center the D-Bar like a Direct To operation.
5.9.8 Changing the CDI Scale Factor
The CDI scale factor can be changed by using either the
MOD 1 or MOD2 pages. In normal operations it is
possible to select a CDI scale factor which is plus or
minus 5 NM, 1 NM or 0.3 NM full scale deflection. This
means that if the scale factor was ±1 NM and the needle
was deflected full scale to the right, the aircraft would be
1 NM left of course. The default CDI scale factor is ±5
NM.
Figure 5-118
ACTIVATE: | FINAL
|REF: BTV
FINAL |RAD: 292.8^
|DIS: 11.7nm
|N 44^25.40'
|W 73^27.20'
CRSR enr:090 ent INT
Figure 5-119
3:GGT | =FINAL
4:BEGIN |+++·+i+++++
5:INITT |DIS 4.8nm
= 6:FINAL |GS 122kt
7:MMAPP |ETE :02
8:KHOM |BRG 088^
FPL 0 enr:090 NAV 1
Figure 5-116
3:GGT | =INITT
4:BEGIN |+++·+j+++++
= 5:INITT |DIS 0.4nm
6:FINAL |GS 122kt
7:MMAPP |ETE :00
8:KHOM |BRG 275^
CRSR enr:090 NAV 1
Figure 5-115
| =GGT
|+++++i+·+++
|DIS 20.0nm
|GS 154kt
|ETE :08
|BRG 234^
$= CRS 234 NAV 1
Figure 5-117
DIRECT TO: | FINAL
|REF: BTV
FINAL |RAD: 292.8^
|DIS: 11.7nm
|N 44^25.40'
|W 73^27.20'
CRSR enr:090 ent INT