- wiring of the YAW V1 COM and YAW V2 COM discretes (from the yaw damper servo-actuator,2 (3CC2) to the FAC 2 (1CC2))

 - servovalve of the SERVO ACTR-YAW DAMPER, 2 (3CC2)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 22-63-00-710-001 Operational Test of the Yaw Damper Function AMM 22-66-34-000-002 Removal of the FAC (1CC1,1CC2) AMM 22-66-34-400-002 Installation of the FAC (1CC1,1CC2) AMM 22-96-00-710-001 Operational Test of the AFS AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
 External Power AMM 27-26-51-000-001 Removal of the Yaw Damper Servo Actuator (3CC1) and
 (3CC2) AMM 27-26-51-000-002 Removal of the Servovalve AMM 27-26-51-000-003 Removal of the Solenoid Valve AMM 27-26-51-000-004 Removal of the Pressure Switch AMM 27-26-51-400-001 Installation of the Yaw Damper Servo Actuator (3CC1)
 and (3CC2) AMM 27-26-51-400-002 Installation of the Servovalve AMM 27-26-51-400-003 Installation of the Solenoid Valve AMM 27-26-51-400-004 Installation of the Pressure Switch AMM 29-10-00-863-003 Pressurize the Blue Hydraulic System with a Ground
 Power Supply
 AMM 29-23-00-863-001  Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
 AMM 29-24-00-863-001 Pressurize the Yellow Hydraulic System with the
 Electric Pump
 ASM 22-68/04

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 3. Fault Confirmation
__________________

 WARNING : MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE
_______
 YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT.

 WARNING : MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES
_______ ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
 A. Job Set-Up
 (1) Aircraft Maintenance Configuration
 (a) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

 (b) Pressurize the aircraft hydraulic systems (Ref. AMM TASK 29-23-00-863-001), (Ref. AMM TASK 29-24-00-863-001) and (Ref. AMM TASK 29-10-00-863-003).

 B. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU AUTO FLT/FAC2/28VDC 5CC2 M19 121VU AUTO FLT/FAC2/26VAC 14CC2 M18
 C. Test
 (1) Open the circuit breaker 5CC2.

 (2) After a minimum of 10 seconds, close the circuit breaker 5CC2.

 (3) After 2 minutes, do the operational test of the AFS (Ref. AMM TASK 22-96-00-710-001) and read the result for the FAC 2.

 4. Fault Isolation
_______________
R
 A. If the test gives the maintenance message AFS: FAC2/YD ACTR2 3CC2: R R - open the circuit breakers 5CC2 and 14CC2, R - remove the FAC-2 (1CC2) (Ref. AMM TASK 22-66-34-000-002) and disconnect R the plug at the YAW DAMPER Servo-Actuator 2, R - do a check of the wiring between respectively:
R . The pins AF/4 and AF/6 of the FAC2 and the pins A/E and A/D of the
R YAW DAMPER Servo-Actuator,2,

R . The pins AC/4 and AC/6 of the FAC2 and the pins B/A and B/B of the
R YAW DAMPER Servo-Actuator,2.
R (Ref. ASM 22-68/04)

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R (1) If the wiring is not correct:
R - repair it.

R (2) If the wiring is correct:
R - connect the above mentioned plug,
R - do a check of the impedance between respectively:

R . the pin AC/4 and the pin AC/6,

R . then the pin AF/4 and the pin AF/6 of the FAC-2 rack connector.

R NOTE : The impedance must be more than 40 Ohms.
____
R (a) If the impedance is correct:
R - replace the FAC-2 (1CC2) (Ref. AMM TASK 22-66-34-400-002).

R (b) If the impedance is not correct:
R - replace the solenoid valve 1 or 2 of the SERVO ACTR-YAW DAMPER,
R 2 (3CC2) (Ref. AMM TASK 27-26-51-000-003) and (Ref. AMM TASK
R 27-26-51-400-003),
R - install the above removed FAC-2 (1CC2) (Ref. AMM TASK 22-66-34-
　
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