AIRPLANES WITH DELCO INS CONFIG 1 01 A Page 26 Apr 25/8734-41-00
HEADING
WARNING TRUE/MAG HEADING
FLAG ANNUNCIATOR
MILES-TO-GO
INDICATOR LUBBER
LINE
DRIFT ANGLE GROUND SPEED
MARKER INDICATOR
PRESET HEADING MARKER DRIFT ANGLE SCALE
MILES GND SPEED
COURSE ARROWVOR-ILS/INS
ANNUNCIATOR
I
N
TO-FROM POINTER S
1/2/3 DATA SOURCE ANNUNCIATOR
G
GLIDE SLOPE
1 S
DEVIATIONNAVIGATION POINTERWARNING FLAG
A
L
AIRCRAFT SYMBOL GS WARNING FLAG
E WAYPOINT ALERT R T
ANNUNCIATOR AZIMUTH CARD
COURSE TAIL
DRIFT ANGLE MASK
COURSE DEVIATION BAR HSI WARNING FLAGS AND INDICATORS
DSRTK 075
DA
TRUE HDG 044 19` R
TKE 50` L XTK 4.0 KMI
TK 025
MILES GND SPEED
I
N
S
2
A L E R T
TYPICAL HEADING - ORIENTED HSI DISPLAY
Horizontal Situation Indicator
Figure 11
EFFECTIVITY
AIRPLANES WITH DELCO INS CONFIG 1798 Page 27
34-41-00
Apr 25/86
H. The waypoint selector, in conjunction with the WAYPT position of the
data selector, allows waypoint and destination positions to be inserted
into the computer in the proper sequence. During flight, the automatic
navigation leg switching by the computer is accomplished in sequence
according to the inserted positions from 1 to 9 unless a course change
is inserted. The previously inserted latitude and longitude for a
waypoint/destination is indicated in the data displays when the waypoint
selector is set to the waypoint number (1 thru 9) and the data selector
is set to WAYPT. The position coordinates displayed when the waypoint
thumbwheel selector is set to 0 are normally those of the original
departure point inserted at time of alignment. The displayed
coordinates can be changed, however, if a course change is made during
flight (0 in FROM display) or a position update is performed after
landing. The coordinates are changed each time one of the three
actions-preflight alignment, course change, or postflight position
update-is accomplished.
On airplanes with Delco CIVA-20, CIVA-25, CIVA-28A or CIVA-28A-2 INS,
XA see *[1] and *[2], 34-41-00 page 1;
the waypoint (waypoint/DME) selector, in conjunction with the WAYPT
position of the data selector, allows either waypoints or DME station
data to be inserted into the computer memory.
I. To ensure waypoint loading integrity, the setting of the CDU waypoint
selector (thumbwheel switch) is shown in the FROM side of the CDU FROM-
TO display. This is accomplished as follows:
(1) When the data selector on the CDU is at WAY PT, the WY PT CHG key
is not lit, and the CDU is not in a DME data display/load mode, the
FROM side of the FROM-TO display will display a number (from 0 to
9) which is the INS computer's interpretation of the setting of
the waypoint selector on the CDU. The TO side will be blank.
Changing the waypoint selector to a new setting will cause a
corresponding change in the FROM display.
J. The FROM-TO display indicates two origin/waypoint/destination numbers
describing the navigation leg for which automatic navigation data is
being computed. Waypoint numbers 1 2 are always displayed at INS turn
on. As a flight progresses through waypoints, the FROM-TO display
automatically changes to indicate the next navigation leg when a
waypoint is reached. The normal automatic sequence is 1 2, 2 3, 3 4,
etc. The waypoint sequence can be interrupted at any time by loading
different numbers into the FROM-TO display and inserting them into the
computer to cause a course change. The number 0 represents a point on
one of the navigation legs at which a course change was initiated.
On airplanes with Delco CIVA-28A-2 INS,
the thumbwheel switch display of an active waypoint will flash at a
0.6-second rate when groundspeed is 150 knots or greater. This is to
alert the operator that the waypoint being displayed is either the FROM
or TO waypoint and changing the waypoint will affect the leg being flown.
This advisory display will help prevent sudden steering transients which
may occur if the present leg is changed while the INS is coupled.
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