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Deceleration
in flight level
Glideslope
100ft : VAPP
Runway
STL 945.7136/97 10.17
A319/A320/A321 FMGS – vertical profile
􀁺 Take-off :
SRS control law maintains V2 + 10 up to thrust
reduction altitude where max climb thrust is applied.
V2 + 10 is held up to acceleration altitude (ACC LT).
􀁺 Climb :
Energy sharing is applied for acceleration (70% thrust)
and for altitude (30% thrust) from ACC ALT up to first
climb speed. Max climb thrust is kept – Altitude
constraints are taken into account.
􀁺 CRZ :
Steps may exist and/or may be inserted.
􀁺 Descent :
Top of Descent (T/D) is provided on ND.
From T/D down to the highest altitude constraint,
ECON descent speed is supposed to be held on
elevator and IDLE + Δ on thrust.
Then, if this status can no longer be kept, geometric
segments will be followed between the constraints.
􀁺 Approach :
From DECEL point a deceleration allows configuration
changes in level flight.
Approach phase is planned to reach approach speed
at 1000ft above ground level.
STL 945.7136/97 10.18
A319/A320/A321 FMGS – AP / FD modes
Guidance
Lateral
Vertical
Speed
Managed Selected
􀁺 NAV and APP NAV
􀁺 APPR
􀁺 LOC
􀁺 RWY
􀁺 RWY TRK
􀁺 G.A. TRK
􀁺 CLB
􀁺 DES
􀁺 SRS (TO / GA)
􀁺 G / S
􀁺 FLARE
􀁺 FINAL
􀁺 F. PLN reference
(ex. : optimum)
􀁺 Expedite
􀁺 HDG - TRK
􀁺 OP CLB
􀁺 OP DES
􀁺 Expedite (towards altitude
selected on FCU but
managed speed)
􀁺 ALT
􀁺 V / S – FPA
􀁺 FCU selected
STL 945.7136/97 10.19
A319/A320/A321 FMGS – AP / FD modes
􀁺 Managed guidance
Take-off :
- RWY : automatic runway axis follow up
through ILS use
- RWY. TRK : follow up of the memorized runway axis
- SRS : pitch guidance to maintain V2 + 10
Climb/Cruise/Descent :
- NAV : lateral guidance along the defined F.PLN
- CLB/DES : vertical guidance with respect of all the
F.PLN defined constraints
- APP NAV : lateral guidance along a defined non
precision approach
Approach and landing :
- APPR : ILS approach (ILS beams capture and
track) and non precision approach
- LOC : LOC use only (capture and track)
- FLARE : automatically performed around 30ft
- FINAL : vertical guidance along a defined non
precision approach
􀁺 Selected guidance
Lateral :
- HDG/TRK : selected on FCU
Vertical :
- OP CLB/OP DES : open modes for level changes
with a fixed thrust and speed
held on elevator
- EXPED : level change with maximum
climb/descent
- ALT : altitude capture and hold
- V/S-FPA : vertical speed or flight path
angle track
STL 945.7136/97 10.20
A319/A320/A321 ATS – controls and display
Illuminated greed when
A/THR engaged
T.O
G.A
FLX T.O.
MCT
A/THR range
Idle
Reverse
FCU PFD
Displayed
- Cyan when engaged
- White when active
Thrust levers
Instinctive
disconnect
pushbutton
Reverse unlock
STL 945.7136/97 10.21
A319/A320/A321 FMGS – autothrust function
􀁺 Autothrust (A/THR) is part of FMGC
􀁺 No mechanical linkage between levers and engines.
Thrust levers position is measured and transmitted to
the FADEC in digital form.
􀁺 Autothrust :
- either ensures thrust control depending upon
AP/FD modes (if these are engaged)
- or manages thrust to hold the current target speed
(if no AP/FD engaged)
- thrust control is achieved without moving the levers.
􀁺 A/THR engagement status and thrust limit mode
depend upon thrust lever angle (TLA).
Thrust limit selection and computation are made by
the FADEC.
􀁺 5 positions are fitted within the levers position range.
STL 945.7136/97 10.22
A319/A320/A321 FMGS – autothrust function
Not engaged
Engaged
Engaged Active
Not active
0 Both thrust levers at idle result in
REV REV A/THR disengagement
0
Thrust levers
CL CL
FLX / MCT FLX / MCT
TO / GA TO / GA
Thrust levers
0
REV REV
0
CL CL
FLX / MCT FLX / MCT
TO / GA TO / GA
0
REV REV
0
CL CL
FLX / MCT FLX / MCT
　
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