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3-9
Rev 1
3.3 DISPLAY FORMAT
The KLN 90B uses a Cathode Ray Tube (CRT) display.
The display screen is divided into segments. These seg-
ments are formed by horizontal and vertical lines on the
screen. Most of the time there are five segments as
shown in figure 3-28. There are occasionally times when
there are only four segments (figure 3-29) or one large
segment (figure 3-30).
Aeronautical information (also called “data”) is presented
on the screen in the form of “pages”. A page is a presen-
tation of specific data in an organized format. Various
page “types” are used to display related kinds of data.
For example, one page type is NAV (navigation). NAV
pages show information such as distance, groundspeed,
bearing, course, and other data relating to navigation.
Another page type is APT (airport). APT pages contain
information pertinent to a specific airport such as name,
location, elevation, runways, and communication frequen-
cies. There are numerous page types used to display the
KLN 90B’s vast capabilities.
Normally, when the screen is divided into five segments,
the KLN 90B displays two pages at one time. These
pages are presented in the upper left and upper right seg-
ments of the screen. In figure 3-31 the upper left seg-
ment (A) is showing a Navigation page and the upper
right segment (B) is showing an Airport page. The lower
left segment (C) indicates which specific page is being
displayed on the left side. NAV 2 indicates that the
Navigation 2 page is being presented on the left side of
the screen. An Airport 4 page is being shown in the
upper right segment of the display (B) and is identified as
such with the APT 4 characters in the lower right segment
(D). The page identification includes a number appended
to the page type when there is more than one page for a
page type, such as in the two examples of pages shown
in figure 3-31. There is no number displayed in the page
identifier if there is only one page for a particular page
type. The VOR page identification in figure 3-32 shows
that there is only one VOR page.
You might think of the page types as the chapters in a
book and the page numbers as the pages within a chap-
ter. Just as a chapter in a book may have from one to
many pages, a KLN 90B page type may have from one to
26 pages associated with it. There are, for example, 26
Flight Plan pages (FPL0, FPL1, FPL2,...,FPL25) in the
Flight Plan type and eight Airport pages (APT 1, APT 2,
..., APT 8) in the Airport type. There is one VOR page in
the VOR type.
Figure 3-33 shows another example of an Airport 4 page.
As you have previously seen, the Airport 4 page is always
used to show airport communication frequencies. Notice
the “+” sign in the APT+4 identification. Whenever a “+”
sign is part of a page identifier there will be two or more
| JAN D
|JACKSON
| H
|112.60 5^E
|N 32^30.44'
|W 90^10.05'
VOR
| KMKC
|ATIS 120.75
|PTAX 121.90
|GRND 121.90
|TWR 133.30
|UNIC 122.95
APT[4
PRESENT POS|=KHIF
|CLR 124.10
OGD 122^fr|GRND 121.60
8.2nm|TWR 126.20
N 41^07.60'|APR 121.10
W111^58.30'|DEP 121.10
NAV 2 enr-leg msg APT 4
(A) (B)
(C) (E) (D)
Figure 3-32
Figure 3-33
Figure 3-28
Figure 3-29
Figure 3-31
Figure 3-30