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Self Examination
TMUFGCD01 LEVEL 1
EFFECTIVITY 22-10-00 Page 1
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 21
ALL
AUTOPILOT
GENERAL
The autopilot (AP) is engaged from the Flight Control
Unit (FCU) by the related pushbuttons.
Autopilot engagement is indicated by the illumination
of the AP 1 pushbutton or/and the AP 2 pushbutton
(Three green bars) and by the white "AP1", "AP2" or
"AP1+2" indication on the top right of each Primary
Flight Display (PFD).
The autopilot guidance modes are selected from the FCU
or the Flight Management and Guidance Computers
(FMGCs).
The autopilot function is a loop where, after a
comparison between real and reference parameters, the
FMGC computes orders which are sent to the flight
controls.
The loop is closed by real values coming from sensors
and given by other systems (e.g. ADIRS) to the FMGCs.
When the autopilot is engaged, the load thresholds on
the rudder pedals and the sidesticks are increased.
If a pedal or sidestick load threshold is overriden,
the autopilot disengages.
MODES
There are lateral modes and vertical modes.
Basically, one of each is chosen by the pilot or by
the system.
The autopilot being engaged, one lateral mode and one
vertical mode are simultaneously active.
According to flight phases, the lateral mode controls:
- the ailerons via the Elevator Aileron Computers
(ELACs),
- the spoilers via the ELACs and the Spoiler
Elevator Computers (SECs),
- the rudder via the Flight Augmentation
Computers (FACs),
- the nose wheel via the ELACs and the
Braking/Steering Control Unit (BSCU).
The vertical mode controls the elevators and the
Trimmable Horizontal Stabilizer (THS) via the ELACs.
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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AUTOPILOT
TMUFGCD01-P01 LEVEL 1
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 23
ALL
AUTOPILOT
GROUND
For maintenance purposes, the autopilot can be engaged
on ground with both engines shut down.
Hydraulic power is not required.
When an engine is started, the autopilot disengages.
TAKE-OFF
The autopilot can be engaged in flight, provided the
aircraft has been airborne for at least 5 seconds.
CRUISE
In cruise, only one autopilot can be engaged at a time,
priority given to the last engaged. Engaging the second
autopilot disengages the first one.
The ailerons and the spoilers execute the orders of
lateral modes, the elevators and the THS execute the
orders of vertical modes.
NOTE: The rudder is controlled not by the autopilot
but directly by the FACs.
LANDING
If the airfield is equipped with ILS installations,
the autopilot can perform a complete landing with
approach, flare and roll out.
A second autopilot can be engaged (AP 1 active, AP 2
in standby).
NOTE: The rudder is controlled by the autopilot via
the FACs.
During roll out, the autopilot gives steering orders
to the rudder and the nose wheel. These orders depend
on the aircraft speed.
Aileron and spoiler autopilot orders are null.
The THS is reset to 0.5 nose up.
NOTE: The spoilers are directly controlled by the SECs
as airbrakes.
During roll out, at low speed (about 60 knots), the
pilot normally disengages the autopilot by pressing a
takeover pushbutton located on the sidestick.
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
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THIS PAGE INTENTIONALLY LEFT BLANK
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EFFECTIVITY 22-10-00 Page 5
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 25
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SELF EXAMINATION
In cruise, the autopilot lateral mode orders are
executed by:
A - the ailerons and the rudder.
B - the ailerons and the spoilers
C - the spoilers and the rudder.
The nose wheel can be controlled by the autopilot:
A - on ground during take-off.
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