B. Make sure that this(these) circuit breaker(s) is(are) closed:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AUTO FLT/FAC1/28VDC 5CC1 B04 49VU AUTO FLT/FAC1/26VAC 14CC1 B03
C. Test
(1) Open the circuit breaker 5CC1.
(2) After a minimum of 10 seconds, close the circuit breaker 5CC1.
(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 1.
4. Fault Isolation
_______________
R
A. If the test gives the maintenance message AFS: FAC1/YD ACTR1 3CC1: R R - open the circuit breakers 5CC1 and 14CC1, R - remove the FAC-1 (1CC1) (Ref. AMM TASK 22-66-34-000-002) and disconnect R the plug at the YAW DAMPER Servo-Actuator 1, R - do a check of the wiring between respectively:
R . the pins AF/4 and AF/6 of the FAC1 and the pins A/E and A/D of the
R solenoid valve of the YAW DAMPER Servo-Actuator 1,
R . the pins AC/4 and AC/6 of the FAC1 and the pins B/A and B/B of the
R solenoid valve 2 of the YAW DAMPER Servo-Actuator 1.
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-1 rack connector.
R NOTE : The impedance must be more than 40 Ohms.
____
R (a) If the impedance is correct:
R - replace the FAC-1 (1CC1) (Ref. AMM TASK 22-66-34-400-002).
R (b) If the impedance is not correct:
R - replace the faulty solenoid valve 1 and/or 2 of the SERVO
R ACTR-YAW DAMPER, (3CC1) (Ref. AMM TASK 27-26-51-000-003) and
R (Ref. AMM TASK 27-26-51-400-003),
R - install the above removed FAC-1 (1CC1) (Ref. AMM TASK 22-66-34-
400-002), R - close the circuit breakers 5CC1 and 14CC1. R
R B. If the test does not give the maintenance message AFS: FAC1/YD ACTR1
R 3CC1:
R - do the operational test of the yaw damper function (Ref. AMM TASK 22-R 63-00-710-001).
R
R (1) If the yaw damper function is not correct:
R - replace the FAC-1 (1CC1), (Ref. AMM TASK 22-66-34-000-002) and
R (Ref. AMM TASK 22-66-34-400-002).
R (2) If the fault continues:
R - do a check and repair the wiring of the solenoid valve 1 and 2 of
R the SERVO ACTR-YAW DAMPER, 1 (3CC1), (Ref. ASM 22-68/04),
R - if the wiring is correct, replace the solenoid valve 1 and/or 2 of
R the SERVO ACTR-YAW DAMPER, (3CC1), (Ref. AMM TASK 27-26-51-000-003)
R and (Ref. AMM TASK 27-26-51-400-003).
R (3) If the fault continues:
R - do a check and repair the wiring of the pressure switch of the
R SERVO ACTR-YAW DAMPER, 1 (3CC1) (Ref. ASM 22-68/04),
R - if the wiring is correct, replace the pressure switch of the SERVO
R ACTR-YAW DAMPER, (3CC1), (Ref. AMM TASK 27-26-51-000-004) and (Ref.
AMM TASK 27-26-51-400-004).
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R (4) If the fault continues:
- do a check and repair the wiring of the YAW V1 COM and YAW V2 COM
discretes (from the yaw damper servo-actuator,1 (3CC1) to the FAC 1
(1CC1)) (Ref. ASM 22-68/04).
R - if the wiring is correct,do a check and repair the wiring of the
R servovalve SERVO ACTR-YAW DAMPER, 1 (3CC1) (Ref. ASM 22-68/04),
R - if the wiring is correct, replace the servovalve of the SERVO
R ACTR-YAW DAMPER, 2 (3CC1), (Ref. AMM TASK 27-26-51-000-002) and
R (Ref. AMM TASK 27-26-51-400-002),
R
R - if the fault persists, replace the SERVO ACTR-YAW DAMPER, 1
R (3CC1), (Ref. AMM TASK 27-26-51-000-001) and (Ref. AMM TASK 27-26-
51-400-001).
R C. Do the test given in Para. 3.C.
Loss of the Yaw Damper Function on the FAC 2
1. Possible Causes
_______________
- FAC-2 (1CC2)
- SERVO ACTR-YAW DAMPER, 2 (3CC2)
- wiring
- solenoid valve 1 or 2 of the SERVO ACTR-YAW DAMPER, 2 (3CC2) R - solenoid valve 1 and/or 2 of the SERVO ACTR-YAW DAMPER, 2 (3CC2)
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本文链接地址：A320 Trouble Shooting Manual 排故手册 AUTO FLIGHT 自动飞行1(106)
