(c)  
Disengage the autopilot A.

 (d)  
Engage the autopilot B in the CWS mode.

 (e)  
Make sure that the autopilot B is engaged in the CWS mode.

 (f)  
Disengage the autopilot B.

 (g)  
Do this task: "Prepare to test VOR/ILS Navigation System" (Ref 34-31-02/501).

 (h)  
Do the test VOR Self-Test Function in this task: "Operational Test - VOR/ILS Navigation System" (Ref 34-31-02/501).

 S 864-008
 (7)  Remove electrical power if it is not necessary (Ref 24-22-00/201).
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 22-11-37
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 864-016
 (8) Remove hydraulic power if it is necessary (Ref 29-15-00/201).
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 22-11-37
 ACCESSORY UNIT (IFSAU)  ú ú 03 Page 404 ú Nov 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ANGLE OF AIRFLOW SENSOR - ADJUSTMENT/TEST
_________________________________________
 1.  General_______
 A.  This procedure contains the installation test of the angle of airflow sensor (ALPHA).
 B.  The left angle of airflow sensor (ALPHA) is part of the No. 1 stall warning system. The left ALPHA sensor also supplies signals to the autothrottle system, system A AP/FD, and autoslat system. The right angle of airflow sensor (ALPHA) is part of the No. 2 stall warning system. The right ALPHA sensor also supplies signals to the system B AP/FD and autoslat system.
 C.  The DFCS Built-In Test Equipment (BITE) is used to do the operational test after the installation of the angle of airflow sensor. This test makes sure that the ALPHA sensors supply the correct autopilot synchro input to the AP/FD. It uses no external equipment. The airplane electrical and hydraulic power are the only sources necessary for this task.
 TASK 22-11-38-715-002
 2.  Angle of Airflow Sensor Test____________________________
 A.  References
 (1)
22-11-01/501 or 22-11-00/501, Digital Flight Control System

 (2)
24-22-00/201, Manual Control

 B.  Access
 (1)  Location Zones
 101 Control Cabin, Left
 102 Control Cabin, Right

 C.  Prepare for the Angle of Airflow Sensor Test
 S 865-001
 (1) Supply electrical power (Ref 24-22-00/201).
 S 865-003
 WARNING:_______DO NOT TOUCH THE ALPHA VANES WHEN THEY ARE HOT. THE HOT ALPHA VANES CAN CAUSE INJURY.
 (2)
Make sure that you remove heater power from the ALPHA sensors.

 (3)
Set the two ALPHA vanes to a trailing edge down position.

 S 865-004
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 22-11-38
 ALL  ú ú 02 Page 501 ú Mar 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-005
 (4)  Make sure that the LANDING GEAR AIR/GND RELAY circuit breaker on the P6 Circuit Breaker Panel is closed.
 D.  Angle of Airflow Sensor Test
 S 745-010
 (1)  
Do the preparation for the DFCS BITE test in this task: "Operational Test - Digital Flight Control System" (Ref 22-11-01/501 or 22-11-00/501).

 S 745-007

 (2)  
Do the ALPHA sensor interface test:

 (a)  
Push the INIT REF key on the CDU keyboard.

 (b)  
Push the LSK adjacent to INDEX>.

 (c)  
Push the LSK adjacent to MAINT>.

 (d)  
　
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