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- If a failure occurs in ELAC2 or the associated hydraulic systems or hydraulic jacks, the
   system shifts pitch control to ELAC1. ELAC1 then controls the elevators via the blue
   hydraulic jacks and controls the THS via the N~ 2 electric motor.
- If neither ELAC1 nor ELAC2 is available, the system shifts pitch control either to SEC1
   or to SEC2, depending on the status of associated circuits, and to THS motor N~ 2 or
   N~ 3.
Page 8, below, describes how the actuators are reconfigured in case of failure.
MECHANICAL CONTROL
Mechanical control of the THS is available from the pitch trim wheel at any time if either
the green or the yellow hydraulic system is functioning.
Mechanical control from the pitch trim wheel has priority over electrical control.
CCM ALL
┏━━━━━━━━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━━━┓
┃J  -~ A318                      ┃FLIGHT CONTROLS ┃1.27.10     P 7       ┃
┃  .*,,.8, ,, ~L,~ A319          ┃                ┃                      ┃
┃                                ┃                ┣━━━━━┳━━━━━┫
┃ Lli,~ A320                     ┃                ┃SEQ 100 I ┃J REV 23  ┃
┃      A~7-~'M" A321             ┃   DESCRIPTION  ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                ┃          ┃          ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━┻━━━━━┻━━━━━┛
ACTUATION
Elevators
Two electrically controlled hydraulic servojacks drive each elevator.
Each servojack has three control modes :
~ Active     : Jack position is electrically controlled.
~ Damping   : Jack follows surface movement~
~ Centering   : Jack is hydraulically retained in neutral position~
In normal operation :
~ One jack is in active mode.
~ The other jack is in damping mode~
~ Some maneuvers cause the second jack to become active~
If the active servojack fails, the damped one becomes active and the failed jack is
automatically switched to the damping mode.
If neither jack is being controlled electrically nor hydraulically, both are automatically
switched to the centering mode~
If one elevator fails, the deflection of the remaining elevator is limited to avoid putting
excessive asymmetric loads on the horizontal tailplane or rear fuselage.
Stabilizer
A screwjack driven by two hydraulic motors drives the stabilizer.
The two hydraulic motors are controlled by :
~ one of three electric motors, or
~ the mechanical trim wheel.
CCM ALL
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┃                                ┃                            ┃1.27.10     P 8       ┃
┃                                ┃                            ┣━━━━━┳━━━━━┫
┃I  ~-~ A318                     ┃I        FLIGHTDESCRIPTION  ┃SEQ 001 1 ┃I REV 23  ┃
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual3(76)