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Thrust lever position below rev. idle modulates reverse
power.
Automatic engine idle setting in case of reverser
malfunction.
Automatic max. reverse power limitation versus
ambient conditions with full rearward thrust lever
position.
Display of reverser status on ECAM upper DU.
STL 945.7136/97
A319/A320/A321 engine controls - start procedure
8.18
°
°
°
°
CFM
Upper
ECAM DU
SEAT BELTS
NO SMOKING
CTR TK FEEDG
IAE
SEAT BELTS
NO SMOKING
CTR TK FEEDG
TAT + 19 °C
SAT + 18 °C 23 H 56
G.W. 60300 KG
°
ENG
1
ENG
2
MASTER 1 MASTER 2
ON
OFF
ON
MODE OFF
NORM
CRANK
IGN
START
FIRE FIRE
FAULT FAULT
Lower ECAM DU
STL 945.7136/97
A319/A320/A321 engine controls - start procedure
8.19
􀁺 Engine mode selection IGN/START
ECAM ENG page is automatically displayed on lower ECAM.
- Pack valves close (CFM engines)
􀁺 MASTER switch ON
- Start valve opens
- APU RPM increases
- N2 increases
- Oil pressure increases
- Pack valves close (IAE engines)
Depending on N2 values reached :
- Ignition starts
- HP fuel valve opens
When sufficient N2 value is reached :
- Start valve closes, ignition stops, APU RPM returns to normal, pack valve reopens.
􀁺 Main and secondary parameters CHECK NORMAL
For abnormal conditions on ground :
FADEC automatically controls :
- Start abort in case of hot start, hung start or no light up.
- Automatic engine crank after :
- first start abort for IAE
- any additional start attempts for CFM.

STL 945.7136/97
9. Auxiliary power unit
9.1
STL 945.7136/97
A319/A320/A321 APU – controls and display
9.2
ECAM lower display :
APU system page
APU generator
line contactor
APU generator
parameters
APU speed
APU EGT
APU bleed
valve position
APU bleed air
pressure
External panel (on nosewheel)
Overhead panel
APU shut-off push-button
°
°
°
STL 945.7136/97
A319/A320/A321 APU
9.3
􀁺 On ground, pneumatics and electrical sources by :
- providing bleed air for engine start and air
conditioning systems;
- providing electrical power to supply the electrical
system,
the APU makes the aircraft independent of
􀁺 In flight, provision of back-up power for electrical and
air conditioning systems,
􀁺 The APU may be started using either the aircraft
batteries, external power or normal aircraft supply.
The normal flight envelope does not impose any
limitations for starting.
􀁺 The APU is automatically controlled by the Electronic
Control Box (ECB) which is mainly acting as FADEC
for monitoring start and shut-down sequences, bleed
air and speed/temperature regulation.
􀁺 Control and displays :
- on the overhead panel for APU normal operation
and fire protection
- on the ECAM for APU parameters display
- on the external panel, under the nose fuselage, for
APU shut down.

STL 945.7136/97
10. Automatic flight system
10.1
STL 945.7136/97 10.2
A319/A320/A321 FMGS system architecture
Yaw control
Yaw control
FAC 2
FAC 1
FMGC
2
FMGC
1
FCU
MCDU2
MCDU1
FADEC
engine 1
FADEC
engine 2
STL 945.7136/97 10.3
A319/A320/A321 FMGS – AFS/FMS integration
􀁺 Composed of two Flight Management and Guidance
Computers (FMGC), this pilot interactive system
provides :
- flight management for navigation, performance
optimization, radio navaid tuning and information
display management,
- flight guidance for autopilot commands (to EFCS),
flight director command bar inputs and thrust
commands (to FADECs).
􀁺 Two FACs (Flight Augmentation Computer) provide :
- rudder commands (yaw damping, rudder trim and
limiting, turn coordination, automatic engine failure
compensation),
- flight envelope and speed computation.
􀁺 For operational convenience the FMGS offers two
types of guidance concept :
- managed according to FMGS flight plan data
entered into the Multipurpose Control and Display
(MCDU),
- selected by the pilot through the Flight Control Unit
(FCU).
􀁺 The AP/FD achieves either :
- automatic control of the aircraft with regard to
　
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