TASK 22-12-01-735-009
 3.  System Test - Yaw Damper System_______________________________
 A.  General
 (1)  This procedure does these tests:
 (a)  
Yaw Damper System Operational Test 1) Yaw Damper Coupler Program Pin Test 2) Yaw Damper Coupler Self-Test

 (b)  
Yaw Damper Coupler Servo Test

 (c)  
Rudder Pressure Reducer Test

 (d)  
Yaw Damper/Airplane Interface Test

 (e)  
Interlock and Light Test

 B.  References
 (1)  
AMM 22-12-01/501, Yaw Damper System

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 27-51-00/501, Trailing Edge Flap System

 (4)  
AMM 29-15-00/201, Hydraulic Systems A, B, and Standby

 (5)  
AMM 34-31-00/501, VOR/ILS Navigation System

 (6)  
AMM 71-11-02/201, Fan Cowl Panels

 C.  Equipment
 (1)  
Radio Altimeter Test Set (AMM 34-48-00/201)

 (2)  
Synthesizer/Function Generator (2 units are necessary)

 (a)  
Wavetek Model 21, Model 171, or Model 278

 (b)  
Hewlett Packard Model 3325B

 (c)  
Simpson Model 420

 (d)  
An equivalent to the above

 (3)  
Multimeter

 (a)  Dana 4003 Digital
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 22-12-01
 COUPLER  ú
 ú 02 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 505Mar 12/02 

A
737-300/400/500MAINTENANCE MANUAL
 (b)  
Fluke Digital

 (c)  
An equivalent to the above

 (4)  VOR/ILS Ramp Test Set
 (a)  
Collins 972Q-4

 (b)  
Instrument and Flight Research NAV-401L

 (c)  
Tel Instrument Electronics T-30A, T-30B, T-30C, T-30D

 (d)  
An equivalent to the above

 D. Access
 (1)  
Location Zones
 101/102 Flight Compartment
 205 Electronic Compartment
 503 Left Engine - Fan Frame 4 o'clock
 603 Right Engine - Fan Frame 4 o'clock

 (2)  
Access Panels
 1201 Electronic Equipment Access Door
 5737L Right Fan Cowl Panel - Left Engine
 5837L Right Fan Cowl Panel - Right Engine

 E. Prepare for the Test
 S 715-022
 (1) Do the Yaw Damper System - Operational Test (AMM 22-12-01/501).
 (a)  Do not do these steps at the end of the Operational Test: 1) Do not close the electronic equipment access door. 2) Do not remove electrical power.
 S 865-010
 (2)  Supply electrical power (AMM 24-22-00/201).
 S 865-011
 WARNING: KEEP PERSONS AND EQUIPMENT CLEAR OF THE FLIGHT CONTROL
_______ SURFACES, THE THRUST REVERSERS, AND THE LANDING GEAR. THESE COMPONENTS CAN MOVE SUDDENLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (3)  
Supply hydraulic power (AMM 29-15-00/201).

 S 865-031

 (4)  
Set the FLT CONTROL B switch on the P5 overhead panel to OFF.

 (a)  
Make sure that the yaw damper disengage warning light on the P5 overhead panel comes on.

 (b)  
Make sure that the FLT CONTROL B low pressure light on the P5 overhead panel comes on.

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 22-12-01
 COUPLER  ú
 ú 01 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 506Nov 12/99 

A 737-300/400/500MAINTENANCE MANUAL
 S 865-045
 (5)  
Make sure that the yaw damper engage switch on the P5 overhead panel is set to OFF.

 S 865-033

 (6)
Set the IRS transfer switch on the P5 overhead panel to NORMAL.

 S 865-034

 (7)  
　
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