WARNING:  MAKE SURE ALL PERSONNEL AND OBSTRUCTIONS ARE CLEAR OF AILERON, ELEVATOR OUTBOARD SPOILERS AND RUDDER SYSTEMS. SURFACES AND CONTROLS MAY MOVE ABRUPTLY WHEN HYDRAULIC POWER IS APPLIED.

(4)  
Ensure following circuit breakers on load control center P6 are closed:

MASTER CAUTION BUS (2)
MASTER DIMMING BUS INDICATOR LIGHTS (9)
DIM AND TEST
YAW DAMPER AC
YAW DAMPER DC
ENG INTLK 

C.  Test Yaw Damper System
(1)  Test Yaw Damper Indicator Lights
(a)  
Observe that YAW DAMPER warning light located on overhead panel and two MASTER CAUTION lights and FLT CONT annunciator light located on light shield are illuminated.

(b)  
Place LIGHTS switch on center instrument panel first in DIM position then in BRT position. Observe that YAW DAMPER warning light dims and then illuminates brightly. 

(c)  
Depress either MASTER CAUTION light. Observe that both MASTER CAUTION lights and FLT CONT annunciator light go out and YAW DAMPER warning light remains illuminated.

(d)  
Momentarily depress annunciator light. Observe that both MASTER CAUTION lights and FLT CONT annunciator light comes on.

NOTE: Disregard other master caution annunciator lights that illuminate.
(2)  
Test Yaw Damper Interlocks

(a)  
Engage YAW DAMPER engage switch. Observe that YAW DAMPER warning light extinguishes after approximately 2 seconds and both MASTER CAUTION lights extinguish.

(b)  
Open YAW DAMPER AC circuit breaker. Observe that YAW DAMPER warning light illuminates, YAW DAMPER engage switch disengages after approximately 2 seconds, and rudder does not deflect more than 1/2 degree.

(c)  
Close YAW DAMPER AC circuit breaker and engage YAW DAMPER engage switch. Within 2 seconds momentarily open and close ac circuit breaker. Observe that engage switch remains engaged, YAW DAMPER warning light illuminates immediately and remains on for approximately 2 seconds.

(3)  
Test Flight Control Switches Interlock

(a)  
Engage YAW DAMPER engage switch and position FLT CONTROL B switch to OFF. Observe that YAW DAMPER engage switch disengages.

(b)  
Return FLT CONTROL B switch to ON.

(c)  
Engage YAW DAMPER engage switch.

(d)  
Position FLT CONTROL A switch to OFF. Observe that YAW DAMPER engage switch does not disengage.

(e)  
Return FLT CONTROL A switch to ON.

(f)  
Disengage yaw damper.

(4)  
Test Yaw Damper System Response

(a)  
Station observer facing tail of airplane to monitor rudder deflection.

(b)  
Engage YAW DAMPER engage switch. 

(c) 
 Place and hold YAW DAMPER TEST switch, on center instrument panel, in R (right) position. Observe that yaw damper indicator deflects right momentarily and returns to center (zero) and rudder momentarily deflects right and returns to center.

(d)  
Release YAW DAMPER TEST switch. Observe that rudder momentarily deflects left and returns to center.

(e)  
Place and hold YAW DAMPER TEST switch in L (left) position. Observe that yaw damper indicator deflects left momentarily and returns to center (zero) and rudder momentarily deflects left and returns to zero.

(f)  
Release YAW DAMPER TEST switch. Observe that rudder momentarily deflects right and returns to center.

(5)  
Test Yaw Damper Continuity

(a)  
Position FLT CONTROL A switch to OFF and repeat steps (4)b) thru (4)f). Observe that results are satisfactory.

(b)  
Position FLT CONTROL A switch to ON and position FLT CONTROL B switch to OFF. Observe YAW DAMPER disengage switch disengages.

(6)  
Yaw Damper Self test (Coupler P/N 4030952)

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(a)  General 1) Line voltage must be 115 +5.8 volts ac and 28 +1.4 volts dc. 2) Autopilot warning lights will come on steady when the BITE switch is positioned
to ARM. 3) Airspeed must be at zero knots. 4) When self-testing, the yaw damper is engaged unless stated otherwise during
the test. Steps (tests) do not have to be completed in sequence unless stated otherwise in a test. When a step says "repeat" or a particular test is desired, cycle BITE switch to off then to ARM and press GO switch repeatedly until one less than desired test is indicated; allow to run to completion; ignore fail indication and then press GO to advance to desired test.
　
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