(i) 
 Level vertical gyros.

(5)  
Test LOC Warning

(a)  
Prepare the two signal generators by setting generators to different localizer frequencies, one for each NAV receiver.

(b)  
Set VOR/ILS 1 and 2 on corresponding localizer frequencies. Captain's and first officer's HSI deviation bars should be centered. Check that LOC lights on instrument warning panels are out.

(c)  
Apply a localizer test signal to VOR/ILS 1 receiver such that captain's HSI deviation bar indicates that airplane is 1/4 dot right. Apply localizer test signal to VOR/ILS 2 receiver such that first officer's HSI deviation bar is between 1/4 and 1/2 dot left. Check that LOC lights come on.

(d)  
Repeat step (c) interchanging VOR/ILS 1 and 2 test signals and captain's and first officer's HSI indications.

(6)  
Test Glide Slope (GS) Warning

(a)  
Place VHF NAV transfer switch in NORMAL position. With VOR/ILS l and 2 receivers still on localizer frequencies, apply a signal to both glide slope receivers for a 2-dot fly-up indication on captain's and first officer's HSI's. Check that GS lights on instrument warning panels do not come on.

(b)  
Reduce fly-up signal to VOR/ILS 1 receiver to 1-dot. Check that GS lights come on.

(c)  
Repeat steps (a) and (b) except reduce fly-up signal to l-dot for VOR/ILS 2 receiver instead of VOR/ILS 1 receiver in step (b).

(d)  
Repeat steps (a) thru (c) for fly-down signal.

5C8 
34-29-0 Page 504  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Jun 20/83 

E.  Restore Airplane to Normal Configuration
(1)  
Remove test equipment.

(2)  
Open vertical gyro circuit breakers and wait approximately 15 minutes for vertical gyros to coast down.

(3)  
Install vertical gyros in airplane and close vertical gyro circuit breakers. Verify that this system indicates attitude of airplane.

(4)  
If no longer required, remove electrical power from airplane.

554 
Aug 01/75  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  34-29-0 Page 505 

COMPARATOR WARNING UNIT - REMOVAL/INSTALLATION
1.  General
A.  The comparator warning unit is rack mounted on rack E3-4 in the main equipment center. Electrical connections are made at the rear of the unit.
2.  Remove Comparator Warning Unit
A.  Open COMPARATOR-MON and COMPARATOR-PWR circuit breakers on P6 load control center.
B.  Carefully remove comparator warning unit from mount (Ref 20-10-0, E/E Rack Mounted Components).
3.  Install Comparator Warning Unit
A.  Ensure COMPARATOR-MON and PWR circuit breakers are open.
B.  Position comparator warning unit in mount and secure.
C.  Test comparator warning unit electrical connections as follows:
(1)  
Provide power to P6 load control center.

(2)  
Close circuit breakers opened in par. 2.A. above.

(3)  
Comparator warning unit and lights may be tested by pressing TEST button. When button is depressed, all annunciator lights except MON PWR will illuminate, indicating that comparator warning unit is functioning.

NOTE: Annunciator lights can be dimmed by pushing on PUSH-TO-DIM bar.

(4)
Remove electrical power if no longer required (Ref 24-22-0, Electrical Power).

597 
Feb 20/86  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  34-29-11 Page 401 

NAVIGATION WARNING ANNUNCIATOR - REMOVAL/INSTALLATION
1. General
A.  The navigation warning (instrument comparator) annunciators are installed on the captain's and first officer's main instrument panels.
2.  Remove Navigation Warning Annunciator
A.  Open COMPARATOR-MON and COMPARATOR-PWR circuit breakers on P6 load control center.
B.  Remove attaching screws or module retainer.
C.  Disconnect electrical connector from annunciator module.
D.  Remove annunciator module from instrument panel.
3.  Install Navigation Warning Annunciator
A.  Ensure COMPARATOR-MON and PWR circuit breakers are open.
B.  Connect electrical connector to annunciator module.
C.  Secure annunciator module to instrument panel with attaching screws or module retainer.
D.  Test annunciator electrical connections as follows:
(1)  
Provide electrical power to P6 load control center.

(2)  
Close circuit breakers open in par. 2.A. above.

(3)  
Comparator warning unit and lights may be tested by pressing TEST button. When button is depressed, all annunciator lights except MON PWR will illuminate, indicating that comparator warning unit is functioning.
　
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