(b)  
Make sure the IRS transfer switch is in the NORM position.

 (c)  
Make sure the two IRUs are aligned and in the NAV mode (Ref 34-28-01/501).

 (d)  
Make sure the SYS DSPL switch is in the L position.

 (e)  
Set the portable tester to SUBFRAME 0, WORD 54.

 (f)  
Hold DSPL SEL switch on the ISDU to the Test position for more than 10 seconds.

 (g)  
Make sure the portable tester display is 1370 to 1510.

 S 735-415
 (4)  Do this test of the signals from the right IRU.
 (a)  
Turn the SYS DSPL knob to the R position.

 (b)  
Put the IRS transfer switch in the BOTH-ON-2 (or BOTH-ON-R) position.

 (c)  
Set the portable tester to SUBFRAME 0, WORD 29.

 (d)  
Hold the DSPL SEL switch on the ISDU to the TEST position for more than 10 seconds.

 (e)  
Make sure the portable tester display is 6736 to 7224.

 S 865-416
 (5)  If you will do no more tests, then do this task:
 "Put the Airplane to its Usual Condition."

 TASK 31-24-01-735-417
 28. SMC Digital Bus Signals Test____________________________
 A. Special Tools and Equipment
 (1)  Angle of Attack Vane Protractor
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 31-24-01
 ú ú 21B Page 536 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B. Access
 (1)  Location Zones
 101 Control Cabin - Left
 102 Control Cabin - Right

 C. Procedure
 S 865-419
 (1)  
Make sure you did the Prepare For Input Parameter Test task.

 S 865-420

 (2)  
Set A and B PITOT STATIC HEAT switches to the OFF position.

 NOTE: This removes the heater power from the angle-of-airflow
____ (Alpha) vanes, so you can touch the vanes and not get burns.
 S 865-421
 WARNING:_______MAKE SURE THE VANE IS COOL BEFORE YOU TOUCH IT. HOT ALPHA VANES CAN BURN YOU BADLY.
 (3)  
Turn the left vane slowly to make sure it moves freely.

 S 485-422

 (4)
Attach the portable airflow sensor calibrator to the left vane.

 S 865-423

 (5)  
Make sure the A SNSR EXC AC circuit breaker on the P18-1 circuit breaker panel is closed.

 S 735-424

 (6)  
Do this test of the signals from the SMC:

 (a)  
Use the protractor to put the left alpha vane to the 11° trailing edge up position.

 (b)  
Set the portable tester to SUBFRAME 0, WORD 9.

 (c)  
Make sure the portable tester display is 1042 to 1120.

 S 085-426
 (7)  
Disconnect the portable airflow sensor calibrator from the left vane.

 (8)  
Put the left vane in its usual condition.

 S 865-428

 (9)  
If you will do no more tests, then do this task:
 "Put the Airplane to its Usual Condition."

 S 865-427
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. BEJ 113 ú

 31-24-01
 ú ú 27B Page 537 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 TASK 31-24-01-735-452
 29. AIR/GROUND Signals Test_______________________
 A. Access
 (1)  Location Zones
 101 Control Cabin - Left
 102 Control Cabin - Right

 B. Procedure
 S 865-453
 (1)
Make sure you did the Prepare For Input Parameter Test task.

 S 735-454

 (2)  
Do this test of the AIR/GROUND signals:

 (a)  
Set the portable tester to SUBFRAME 0, WORD 4.

 (b)  
Make sure the BIT 1 light on the portable tester is off.

 (c)  
Push the GND SENSING TEST switch on the landing gear accessory unit on the E11 shelf.
　
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