(2)  
HSI to/from pointer indicates from

(3)  
Associated RMI pointer drives to 180 degrees with respect to indicator lubber line.

(4)  
HSI NAV flag remains in view for 3 seconds depending on the RMI pointer slew time, retracts from view and 25 .5 seconds after initiating VOR self-test, flag reappears and remains in view as long as the VOR test pushbutton is held depressed.

M.  If during the VOR self-test, the HSI course arrow is positioned 5 degrees on either side of the selected course, the course deviation bar will deflect to the appropriate first dot position on the course deviation scale.
N.  For an ILS self-test, an ILS frequency is selected on the VHF nav control panel and either the up/left or the down/right self-test is actuated in turn. Selecting either an up/left or a down/right ILS self-test causes the ADI and HSI glide slope pointers to deflect up or down and the ADI runway symbol and the HSI course deviation bar to deflect left or right. The HSI NAV and GS flags and the ADI RUNWAY and GS flags will remain in view for 3 seconds, disappear, and  20 .5 seconds after initiating test, reappear and remain in view.
NOTE:   1. On GJ ALL EXCEPT B-2504, B-2505 AND B-2524, if the autopilot is in a radio mode and as VOR/ILS self-test is performed, the autopilot mode selector will switch to the manual mode.
2. On GJ B-2504, B02505 and B-2524, if the autopilot is in a radio mode, VOR/ILS self-tests are inhibited.
5C8 
34-31-0 Page 8  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/89 

O.  Interface of the navigation systems is shown in Fig. 3. RF signals from the VOR or GS antenna are fed to their respective nav receivers. Heading generated in the compass system is also sent from the RMI's to the NAV receiver. Using these signal inputs, the receiver processes the signals used by the navigation system. With the navigation transfer switch in NORMAL position, the signal output of nav receiver No. 1 controls the warning flags and GS and course deviation displays in the captain's ADI and HSI, and the signal (narrow) pointer in the RMI. Signals from nav receiver No. 1 also go to the autopilot, flight director computer, ground proximity warning system computer, and to the nav warning comparator. NAV receiver No. 2 and the first officer's ADI, HSI, and RMI operate in a similar manner. When the navigation transfer switch is in BOTH ON 2 position, the captain's and the first officer's ADI, HSI, and RMI receiver their inputs from nav receiver No. 2. When the nav transfer switch is in BOTH ON 1 position all instruments indicate nav receiver No. 1 outputs.
5C8 
Feb 20/89  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  34-31-0 Page 8A/8B 

EFFECTIVITY
GJ ALL EXCEPT B-2504 AND B-2505
5C8 VOR/ILS Navigation System SchematicJun 20/85 Figure 3 (Sheet 1) 34-31-0 Page 9/10 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

EFFECTIVITY

K83069
5C8 VOR/ILS Navigation System SchematicJun 20/85 Figure 3 (Sheet 2) 34-31-0 Page 11/12 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

L35021
5C8 VOR/ILS Navigation System SchematicFeb 20/86 Figure 3 (Sheet 3) 34-31-0 Page 13/14 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EFFECTIVITY
CA ALL EXCEPT B-2501
THRU B-2503

K76949
5C8  VOR/ILS Navigation System Schematic 
Jun 20/85  Figure 3 (Sheet 4)  34-31-0 
Page 15 

BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

O.  Interface of the navigation systems is shown in Fig. 3. RF signals from the VOR or GS antenna are fed to their respective nav receivers. Heading generated in the compass system is also sent from the compass coupler or the RMI's to the nav receivers. Using these signal inputs, the receiver processes the signals used by the navigation system. With the navigation transfer switch in NORMAL position, the signal output of nav receiver No. 1 controls the warning flags and GS and course deviation displays in the captain's ADI and HSI, and the single (narrow) pointer in the RMI. Signals from nav receiver No. 1 also go to the autopilot, flight director, ground proximity warning and instrument warning systems. NAV receiver No. 2 and the first officer's ADI, HSI, and RMI operate in a similar manner. When the navigation transfer switch is in BOTH ON 2 position, the captain's and the first officer's ADI, HSI, and RMI receive their inputs from nav receiver No. 2. When the nav transfer switch is in BOTH ON 1 position all instruments indicate nav receiver No. 1 outputs.
5C8 
34-31-0 Page 16  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Jun 20/85 
　
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