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 3)  Any faults which occur can be reset by resetting the existing fault, powering up the YDMs, or cycling the YD engage switch. These faults are stored in the CMC and can be accessed by the CDU.
 4)  The ground operational mode will be entered upon a successful fault recovery on ground. Flight mode will be entered via the fade-in function upon successful fault recovery in air. Power-up mode is entered after a reset has occurred.
 (3) Upper and Lower Yaw Damper Schematics (Fig. 7 and 8)
 (a) Electrical Power
 1)  Upper yaw damper module operating power consists of +5 and |15 volts dc parallel inputs from FCE power supply modules 1L and 2L.
 2)  Lower yaw damper module operating power consists of +5 and |15 volts dc inputs from FCE power supply module 1R.
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M7363 YAW DAMPER MODULE-LOWER (E2-2)
Yaw Damper - Lower SchematicFigure 7 (Sheet 2)
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 3)  Two parallel inputs from the FLT CONT ELEC circuit breakers supply the 28 volts dc used to drive the fault logic circuitry.
 4)  The 28-volt dc engage solenoid power is supplied by a YAW DAMPER circuit breaker via the ON switch. The 26-volt ac, 400-Hz LVDT excitation is supplied by the FCE power supply modules.
 (b) Inputs 1) Airplane Type Code a) The airplane type code is a five-wire ground combination with a sixth wire for parity. b) The parity monitor checks parity and compares type code with the software issue code. This ensures that the correct software is used for the airplane type in which the yaw damper module is installed. If installed correctly, an APL TYPE CODE VALID signal is issued. A detected failure disengages the yaw damper, turns on the INOP light, provides an EICAS yaw damper message, and provides fault data to the CMC which can be accessed through the control display unit. 2) Channel Code a) The channel code input is a two-wire ground/open combination. One pin is grounded for the upper installation of the module and the other pin is grounded for lower module installation. The monitor checks to ensure only one channel code line is grounded. 3) Hydraulic Pressure Switch a) The hydraulic pressure switch is a two-wire input. One wire is normally grounded at a time, indicating the hydraulic condition (high or low hydraulic pressure state). The failure mode is set if the hydraulic pressure HIGH signal agrees with the hydraulic pressure LOW signal for more than 5 seconds.
 b)  When a failure is detected, the corresponding fault message is sent to the CMC.
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28V DC
C8783
28V DC

FCE PWR
FLT CONT ELEKACCELEROMETERSPLY MODULE
STBY BUS 1L-DCELECTRONICS
A
C10264
FLT CONT ELEK
2L-DC

1 SIGNAL GND
M7953 MODAL SUPPRESSION ACCEL-LDATA BUS NO. 1FWD (STA 320, WL 194, LBL 85)
P7-1 CB PNL ASSYLOGIC GND
B+15V DC
1
B163 ADC-L (E1-2)
|15V DC

INTERNAL
+15V DC
POWER
　
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