(3)  
BCRS - LOC display polarity reversed for back course approaches; G/S pointer and failure flag retract out of view.

 C.  Glideslope deviation is displayed by a horizontal pointer. The pointer moves up and down against the scale marks on the vertical LOC pointer.
 D.  Localizer deviation is displayed by a vertical pointer. The pointer moves laterally against the scale marks on the horizontal G/S pointer.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

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 ú ú 01 Page 4 ú Feb 25/87
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 STANDBY HORIZON INDICATOR - MAINTENANCE PRACTICES
_________________________________________________
 1.  General_______
 A.  This procedure has three tasks. The first task replaces the light in the standby attitude indicator. The second task removes the standby attitude indicator. The third task installs it.
 B.  The standby attitude indicator is installed on the pilots' center instrument panel (P2).
 C.  The lights are found on the light block assembly.
 TASK 34-25-11-032-020
 2.  Standby Attitude Indicator Light Replacement____________________________________________
 A.  Reference
 (1)  AMM 24-22-00/201, Manual Control
 B.  Access
 (1)  Location Zone
 101 Flight Compartment

 C.  Procedure
 S 862-021
 (1) Open these circuit breakers and attach the DO-NOT-CLOSE tags:
 (a)  P18 Load Control Center
 1) STANDBY HORIZON

 S 022-022
 (2)  Do these steps to prepare to remove the standby attitude indicator:
 (a)  
Loosen the two larger indicator clamp screws adjacent to the indicator.

 (b)  
Pull the indicator a sufficient distance from the instrument panel to get access to the lighting block cover.

 S 032-001
 (3)  
Remove the screws that hold the cover, spring blade, and lighting block to the top of the front face of the standby attitude indicator.

 (4)  
Remove the cover and spring blade.

 (5)  
Remove the lighting block.

 S 032-002
 S 222-003
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A 737-300/400/500MAINTENANCE MANUAL
 S 962-004
 (6)  
Install the replacement lighting block on the top of the front face of the standby attitude indicator.

 S 432-005

 (7)  
Put the cover and spring blade back in the correct position and tighten the screws.

 S 422-023

 (8)  
Do these steps to install the standby attitude indicator:

 (a)  
Move the indicator into the instrument panel.

 (b)  
Tighten the indicator clamp screws.

 S 862-024
 (9) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P18 Load Control Center
 1) STANDBY HORIZON

 D. Standby Horizon Indicator Light Installation Test.
 S 862-027
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 712-028

 (2)  
Make sure the panel lights for the standby attitude indicator are on.

 S 712-029

 (3)  
Make sure the standby attitude indicator flag disappears.

 S 862-030

 (4)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

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