22-11-31
 ALL  ú ú 01 Page 508 ú Jul 15/91
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A
737-300/400/500MAINTENANCE MANUAL
 AUTOFLIGHT STATUS ANNUNCIATOR - SERVICING (LAMP REPLACEMENT)
____________________________________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first task is for the replacement of the lamps in the autoflight status annunciator. The second task is the annunciator test. It makes sure that the annunciator operates correctly after the replacement of the lamps.
 B.  There are two autoflight status annunciators installed in the airplane, one on each pilot's instrument panel. When you replace the lamps, you do not have to remove the annunciator.
 C.  Each annunciator has three warning light indicators and a test switch. Each warning light indicator has four filament lamps (each at 28v and 0.4A) . In each warning light indicator, you will find two lamps behind an amber filter and two behind a red filter. The red lamps in the FMC warning light indicator are not connected.
 TASK 22-11-32-963-013
 2.  Lamp Replacement (Fig./301)
________________
 A.  Access
 (1)  Location Zone
 101 Control Cabin - Left
 102 Control Cabin - Right

 B.  Procedure
 S 023-011
 (1)  
Pull the front cap out and hold it down to get access to the lamps.

 S 963-012

 (2)  
Do the lamp replacement:

 (a)  Remove all the lamps in the cap.
 NOTE: In the FMC warning light indicator, you only replace
____ the two lamps installed behind the amber filter.
 (b)  Examine all the lamps.
 S 423-010
 (3)  Lift the cap assembly and move it into the autoflight status annunciator until the cap assembly goes into its position.
 TASK 22-11-32-713-014
 3.  Annunciator Test
________________
 A.  References
 (1)  24-22-00/201, Manual Control
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 22-11-32
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A 737-300/400/500MAINTENANCE MANUAL

28V 0-04A

Autoflight Status Annunciator - Lamp Replacement
Figure 301

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737-300/400/500MAINTENANCE MANUAL
 B. Access
 (1)  Location Zone
 101 Control Cabin - Left
 102 Control Cabin - Right

 C. Procedure
 S 863-004
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 713-005

 (2)  
Hold the TEST switch in the 1 position:

 (a) Make sure all three warning lights come on (in amber).
 NOTE: The A/P and A/T warning lights come on before the FMC
____
 warning light is on.

 S 713-006
 (3)  Release the TEST switch:
 (a)  Make sure all the warning lights go off.
 S 713-007
 (4)  Hold the TEST switch in the 2 position:
 (a)  Make sure the A/P and A/T warning lights come on (in red), then the FMC warning light comes on (in amber).
 S 713-008
 (5)  
Release the TEST switch:

 (a)  Make sure all the warning lights go off.

 (6)  
Remove electrical power (Ref 24-22-00/201).

 S 863-009
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737-300/400/500MAINTENANCE MANUAL
　
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