2. Yaw Damper System Trouble Shooting Charts (Fig. 101, 102)
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
disengaged. Yaw damper sys-tem disengages intermittently. Yaw damper sys-tem disengages when transfer bus is switched to different generator. Yaw damper system does not engage. engaged or system is degree when more than 1/2 Rudder moves unit) System accessory (or Integ Flt AFC accessory unit unit) System accessory (or Integ Flt AFC accessory unit landing. used during the autopilot was flight director or flight where the generator after a bus to a different Switching transfer sory unit) Flt System acces-unit (or Integ AFC accessory Coupler Coupler Flt System accessory unit) AFC accessory unit (or Integ during 30-second interval, does not remain engaged each engagement. If system approximately 30 seconds for gage yaw damper system Engage and manually disen-several times, allowing power is switched. accessory unit) is faulty. for 2 seconds when light illuminates Yaw damper disengageNOTE:____ unit (or Integ Flt System disengages, AFC accessory transfer bus. If yaw damper generator supply to 115V AC verify fault by switching Engage yaw damper system and glideslope mode. pilot was engaged in the flight director or the auto-ent generator, if either the bus is switched to a differ-disengage when the transfer the yaw damper system to It is standard practice for Flt System accessory unit) AFC accessory unit (or Integ If system does not engage, is faulty. and FAIL lights do not illu-minate, coupler is faulty. yaw damper coupler. If PASS Press lamp test switch on is faulty. Replace coupler. (or Integ Flt Replace AFC accessory unit System accessory unit). (or Integ Flt Replace AFC accessory unit System accessory unit). unit). the yaw damper. required. Engage action is No maintenance (or Integ Flt Replace AFC accessory unit System accessory Replace yaw damper coupler.
Yaw Damper System Engage Troubleshooting Chart
Figure 101
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
in left or right position, rudder position indicator bar centered, yaw damper system engaged tion, yaw damper or right posi-locked in left and rudder indicator bar Rudder position system engaged. Rudder locked tion transducer transfer valve Coupler or Coupler or posi- If coupler fails other BITE If coupler fails BITE 1, 3, Conduct BITE. If coupler fails BITE test If coupler fails other BITE sequence, coupler may be and 4, one of rudder components is bad. sequence, coupler may be bad. 1,3, and 4, one of the rudder components is bad. bad. Conduct BITE. trol Unit). Rudder Power Con-(AMM 27-21-91/401, trol unit Replace power con-coupler. (AMM 22-12-21/401, and Transfer Rudder Solenoid Replace transfer Replace coupler. Valves). Replace the valve
rolls. Yaw airplane dutch Rudder oscil-lates or damper engaged. Rudder kicks Coupler Intermittent open in either the Rudder Solenoid or AFC Accessory Unit (or Integ Accessory Unit) Flt System conduct coupler BITE. If coupler fails BITE, coupler is bad. If coupler ok, hydraulic power pack is probably bad (Ref Chapter 27, Rudder and Rudder Trim Control System). Engage yaw damper and If coupler fails BITE test 1,3, and 4, one of these components may be bad. Replace the coupler. Replace Rudder Solenoid or AFC Accessory Unit (or Integ Flt System Accessory Unit).
Yaw Damper System Operation Troubleshooting Chart
Figure 102 (Sheet 1)
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