(2)  
Make sure these circuit breakers are closed:

 (a)  
P6 Main Power Distribution Panel
 1) 6E19 FLT DK LIGHTS PANEL CAPT
 2) 6E23 FLT DK LIGHTS PANEL F/O
 3) 6L1 FLT DECK LIGHT STBY INST

 (b)  
P7 Overhead Circuit Breaker Panel
 1) 7A6 NAV RADIO ILS L
 2) 7B24 STBY INSTR ILS IND
 3) 7B25 STBY INSTR ATTD IND

 E. Standby Attitude Reference System Test
 S 725-020
 (1)  
Operate the test set at an ILS frequency that gives vertical and lateral deviation signals that are on course (Ref 34-31-00/501).

 S 725-034

 (2)  
Make sure that the warning flags are out of view and the deviation bars are in the center.

 S 725-021

 (3)  
Change the lateral test signal to the left side and to the right side. Make sure the lateral deviation bar freely follows the signal.

 S 725-022

 (4)  
Change the vertical test signal up and down. Make sure the vertical deviation bar freely follows the signal.

 S 725-023

 (5)  
Remove the lateral test signal. Make sure the lateral deviation bar retracts from view.

 S 725-024

 (6)  
Set the lateral test signal to on course. Make sure the lateral deviation bar shows on course.

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747-400 MAINTENANCE MANUAL
 S 725-025
 (7)  
Remove the vertical test signal. Make sure the vertical deviation bar retracts from view.

 S 725-026

 (8)  
Set the vertical test signal to on course. Make sure the vertical deviation bar shows on course.

 S 725-027

 (9)  
Set the mode selector switch to B/CRS. Make sure the vertical deviation bar and the lateral deviation bar are in the center.

 S 725-028

 (10)
 Change the lateral test signal to the left side.  Make sure the lateral deviation bar freely follows the signal to the opposite (right) side.

 S 725-037

 (11)
 Change the lateral test signal to the right side.  Make sure the lateral deviation bar freely follows the signal to the opposite (left) side.

 S 725-030

 (12)
 Change the test signal to on course.  Make sure the lateral deviation bar is in the center.

 S 725-031

 (13)
 Set the mode selector switch to OFF.  Make sure the lateral and the vertical deviation bars and the warning flags retract from view.

 F. Put the airplane back to its usual condition.
 S 865-032
 (1)  
Turn off and put the test set back to its usual condition.

 S 865-038

 (2)  
Remove the electrical power if it is not necessary
 (Ref 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 STANDBY ATTITUDE INDICATOR - REMOVAL/INSTALLATION
_________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is for the removal of the standby attitude indicator. The second task is for the installation of the standby attitude indicator.
 B.  The standby attitude indicator (N138) is installed on the pilots' center instrument panel (P2).
 TASK 34-24-01-004-001
 2.  Remove the Standby Attitude Indicator_____________________________________
 A.  Access
 (1)  Location Zone
 221 Control Cabin, LH

 B.  Procedure
 S 864-002
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P6 Main Power Distribution Panel
 1) 6E19 FLT DK LIGHTS PANEL CAPT
 2) 6E23 FLT DK LIGHTS PANEL F/O
　
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