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UF94200
EFFECTIVITY Page 112
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22 - AUTO FLIGHT SYSTEM
22-00-00 FLIGHT GUIDANCE PRIORITY LOGIC
CONTENTS:
Flight Guidance (FG)
Flight Director (FD)
Autopilot (AP)
Autothrust (A/THR)
Flight Mode Annunciator (FMA)
Self Examination
TMUFGCI04 LEVEL 1
EFFECTIVITY 22-00-00 Page 1
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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FLIGHT GUIDANCE PRIORITY LOGIC
FLIGHT GUIDANCE (FG)
The engagement status of the guidance function works
on the MASTER/SLAVE principle.
The master Flight Management and Guidance Computer
(FMGC) imposes all the changes of AP/FD modes and/or
autothrust (A/THR) engagement to the slave FMGC.
Here is an example of a master Flight Management and
Guidance Computer.
Look at the flow chart to understand the priority
logic.
With no Autopilot (AP), no Flight Director 1 (FD1) but
Flight Director 2 (FD2) engaged, FMGC2 is the master
because, following the flow chart, the first three
answers are "NO", but the fourth one is "YES".
TMUFGCI04-T01 LEVEL 1
EFFECTIVITY 22-00-00 Page 2
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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TMUFGCI04-P01 LEVEL 1
FLIGHT GUIDANCE PRIORITY LOGIC - FLIGHT GUIDANCE (FG)
EFFECTIVITY 22-00-00 Page 3
Mar 31/94
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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FLIGHT GUIDANCE PRIORITY LOGIC
FLIGHT DIRECTOR (FD)
Upon energization, both Flight Directors (FDs) are
normally engaged in split configuration.
FMGC1 normally drives the FD symbols (crossed bars or
flight path director symbols) on the Captain (Capt)
Primary Flight Display (PFD).
FMGC2 normally drives the FD symbols on the First
Officer (F/O) PFD.
The "1FD2" indication is displayed on each Flight Mode
Annunciator (FMA) to show that FD1 is engaged on Capt
side and FD2 is engaged on F/O side.
If one FMGC fails, the remaining FMGC drives the FD
symbols on both Primary Flight Displays.
If FMGC1 fails, the "2FD2" indication is displayed on
each FMA to show that FD2 is displayed on both PFDs.
If both FDs fail, a red flag is displayed on each PFD,
provided that the corresponding FD switch is "ON".
TMUFGCI04-T02 LEVEL 1
EFFECTIVITY 22-00-00 Page 4
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 116
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TMUFGCI04-P02 LEVEL 1
FLIGHT GUIDANCE PRIORITY LOGIC - FLIGHT DIRECTOR (FD)
EFFECTIVITY 22-00-00 Page 5
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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FLIGHT GUIDANCE PRIORITY LOGIC
AUTOPILOT (AP)
If one AP is engaged, the corresponding FMGC controls
the flight controls through the Flight Control
Computers.
There is no priority logic in single operation. Last
engaged autopilot is the active one.
Both autopilots can be engaged as soon as the APPROACH
mode is selected on the Flight Control Unit (FCU).
AP1 has priority, AP2 is in standby.
The Flight Control Computers use the AP1 commands
first. A switching is performed to the AP2 commands
in case of AP1 disengagement.
TMUFGCI04-T03 LEVEL 1
EFFECTIVITY 22-00-00 Page 6
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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TMUFGCI04-P03 LEVEL 1
FLIGHT GUIDANCE PRIORITY LOGIC - AUTOPILOT (AP)
EFFECTIVITY 22-00-00 Page 7
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 119
ALL
FLIGHT GUIDANCE PRIORITY LOGIC
AUTOTHRUST (A/THR)
A single autothrust pushbutton switch located on the
FCU enables the engagement or disengagement of the
autothrust function.
The autothrust function is, in fact, composed of two
systems (A/THR1 and A/THR2) which are ready to be
engaged at the same time, but only one system is
selected.
However, the selection of A/THR1 or A/THR2 depends on
the engagement of the AP and FD, i.e. of the
master/slave principle which is known by the FCU and
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