(8)  
MAN (manual data entry) annunciator (amber) - Comes on when tas, mag hdg, or crosstrack offset entries are manually made. Remains on until all manual entries have been manually zeroed.

(9)  
WRN (warn) annunciator (red) - Comes on when ONS failure is detected by integrity monitoring function. Flashes when present position, GMT, or date have not been entered; when tas and/or mag hdg inputs are invalid; when synchronization with received signals has not occurred within 3 minutes of ONS turn-on; when power is restored after a power interrupt that exceeded 7 seconds but was less than 7 minutes; and when ONS fails subassembly self test.

NOTE:  When annunciators (4) thru (9) are extinguished, the system is functioning in the normal Omega navigation mode.

(10)
CLR (clear) pushbutton - Clears displayed data if not yet entered, and clears erroneous data entries.

(11)
HLD (hold) pushbutton - Permits position check and update, action/malfunction codes display, and editing of waypoint sequence.

(12)
ENT (enter) pushbutton - When pressed while on, enters displayed data into RPU computer.

577 
34-59-01 Page 8  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Jan 20/82 

EFFECTIVITY

L37924
5C8 Omega Navigation System Interface SchematicFeb 20/86 Figure 6 (Sheet 1) 34-59-01Page 8A/8B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

EFFECTIVITY
GJ ALL EXCEPT B-2509
AND B-2510

K83229
5C8 Omega Navigation System Interface SchematicJun 20/88 Figure 6 (Sheet 2) 34-59-01Page 9/10 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

K83219
5C8 Omega Navigation System SchematicJun 20/88 Figure 7 34-59-01Page 11/12 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

K73895
593  OMEGA Navigation Relationships 
Sep 20/81  Figure 8  34-59-01 
Page 13 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(13) Display selector switch Selects data for displays as follows:
SET TO  LEFT DISPLAY  RIGHT DISPLAY 
GMT DAT  Greenwich  Date (day-month-year or month-
Mean Time  year or month-day-year sequence, 
depending upon program capability 
and discrete selected) 
TK GS  Acft track angle  Acft ground speed 
HDG DA  Acft heading  Acft drift angle 
XTK TKE  Acft cross trk  Acft trk angle error relative 
distance from track  to desired trk 
angle 
POS  Lat of acft  Long. of acft present position 
present position 
WPT  Lat of waypoint  Long. of waypoint selected by 
selected by WPT sw  WPT sw 
DIS  Great circle  Time to go to next waypoint at 
TIME  distance between  actual and speed or assumed gnd 
acft present posn  speed of 480 knots when true air 
and next waypoint  speed is less than 110 knots 
WIND  Wind direction  Wind velocity 
DTK STS  Acft desired trk  System status and 
action/malfunction codes 
MH TAS  Magnetic heading  True air speed 
STA  Transmitting station status 

AUX  When WPT switch is set as follows, corresponding displays and data entry functions are available.
WPT FUNCTION 0 Relaning in progress 1 GS/DA entry 2 Scratch memory 3 Frequencies being used:
11.3 kHz = 1
13.6 kHz = 2
10.2 kHz = 4

NOTE:  The numeral display is additive, e.g., 1 indicates that only the 11.3 kHz frequencies are being used, 3 indicates that the 11.3 and 13.6 kHz frequencies are being used, and 7 indicates that all frequencies are being used.
4 Quality index 5 VLF station status 6 Grid navigation parameters 7 Reporting waypoint entry and display 8 Distance traveled 9 Display test, aircraft interface test

34-59-01 Sep 20/81 Page 14
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

(14) Mode switch - Selects ONS operating mode as follows:
SET TO MODE OFF Nonoperating; all power removed from ONS. A Automatic operation; with ONS tied to autopilot, acft automatically switches to
next trk leg at waypoints; permits manual override. M Manual operation; operator switches acft to next trk leg at waypoint. R Enables remote ranging operation; ONS otherwise funtions as it would with sw
set to M.
(15)
TK CHG (track change) pushbutton - Provides for entry of initial track leg and allows manual track leg switching.
　
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