I-
5)
DATA Button-A moment-
-,
pushbutton,the DATA Buttonmovesthe
Caret
(
>
c
)
Displayfrom FRO
to
RAD
to
DST andback to FRQ
so
you will always
knowwhich waypoint parameterthe
Data Input Knobsare addressing.
6)RTN
(Retum)
Button-A
momentarypushbuttonthat switches
the displayto the activewaypoint, VOR-
TAC, or
ILS
frequency.This button is
usefulafteryou have entered new data
for other waypointsandwant
to
return
to the navi ation data presentlyin use.
7)
UgE
Button-After callingup
a previouslyentered RNAV waypoint,
VORTAC or
ILS
frequencywith the
Waypoint Select Knob,depressingthis
momentarypush buttonwill put inuse
that waypoint, VOR, VORTAC, or
ILS
frequency.
8)
RAD(Radial) Button-This
two-positionbutton is normallyoperated
inthe outer position. Whendepressed
(inner position),the remotedigital DME
indicatorwill display the radialyou are
on (fromthe activewaypoint or VORTAC
station) insteadof groundspeedand
time to station. This feature can
be
helpfulin many navigationsituations.
This feature becomesinoperativein
DME holdmodeor when DME istuned
from another NAV receiver.
9)
CHK(Cheek)
Button-
Pressingthis momentary pushbutton
displays the aircraft’spresentposition
fromthe VORTAC by replacingthe
waypoint parametersnormally
displayedover RAD and DST on the
KNS81 display with the radialand
distancefrom the VORTAC station
a
Displays:
10)
SystemStatusDisplays-
Completemodeannunciationtellsyou
what mode(VOR, VORIPAR, RNV, or
RNVIAPR)isactive. Note: When an
ILS
Frequencyis selected,the system
automatically
goes
intothe
ILS
mode
regardlessof what mode is
annunciated.
11)
WPT
(Waypoint)Dlspiay-
Shows the waypoint numberof the
waypointdata storage binthat is being
displayedonthe KNS81’s digital read-
out. When the displayedwaypoint
number isdifferentfrom the active
waypoint, the WPT will blink.
12)
Caret Display
(
>
<
)-
Indicatesthe waypoint parameter
(frequency, radial,or distance)that thc
Data Input Knobsare controlling. The
Caret Displaycyclesfrom
FRQ
to
RAD
to DST and back
to
FRQ as the Data
Buttonis pressed.
13)
FRO(Fmquency)Display-
Shows the frequency entered intothe
system for VOR, VORTAC or Localizer
stationswith the Data Input Knobs.
When selecting afrequency, the Carets
mustbe belowthe frequencydisplay.
14)
RAD(Radial)Dlspiay-
Showsthe VORTAC station radialon
which the waypoint is located and is
selectedbythe Data InputKnobswhen
the Caretisbelowthe radialdispla
Whenthe CHK buttonispressed,tks
areawill displaythe radialfrom the
VORTAC stationto the aircraft-an aid
indeterminingcrossfixesandposition
reports.(Note: Inthe VOR mode, this
displaywill show dashesto indicatethat
RNAV radialinformationis irrelevant.)
15)
DST(Distance) Display-
Showsthe distancethe waypoint is
offset from the VORTAC stationand is
selected by the Data InputKnobs when
the Caret is belowthe distancedisplay.
To helpdetermine crossfixes andposi-
tion reports,this areawill display the
distance from the VORTAC station
to
the aircraft when the CHK button is
pressed.(Note: Inthe VOR mode, this
display willshow dashesto indicatethat
RNAV distance information is irrelevant.)
Remote
DMEDisplays
informationispresentedsimultaneously
ona separatepanel-mountedindicator.
Inorderto generate preciseDME Data,
the remote-mountedDMEunitelec-
tronicallyconvertsintodistancethe
elapsedtime requiredfor signalsto
travel
to
andfromthe groundstation.
The resultiqcomputationisthen re-
sentedinnauticalmilesonthe D&
paneldisplay.This distance;,commonly
referredto as “slant r&$$ distance,
should not beconfusedwith aetual
along-the-grounddistance.The dif-
ferencebetweenactualgrounddistance
andslant rangedistance issmallest
at lowaltitudeandlongrange;greatest
at closerange
to
theVORTAC facility.
However
if
the rangeis
3
times the
altitudeor areater.this slant ranaeerror
Withthe KNS81 system, allDME
-
isn
li
ibk.
%d(NautIcal
Miles)Display-In
the
VOR
andVOR/PAR modes.the DME
indicator displays slant rangedistance
8
