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Alternate Law in Spoiler Elevator Computer
Direct Law
Mechanical Back-Up
Pitch Law Reconfigurations
TMUFCT502 LEVEL 3
EFFECTIVITY 27-90-00 Page 1
Mar 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 77
ALL
PITCH CONTROL ABNORMAL D/O
ALTERNATE LAW IN ELEVATOR AND AILERON COMPUTER (With
Protections)
If the normal law of ELAC 2 fails, the control passes
to ELAC 1. If the normal law of both ELACs fails, the
alternate law takes over.
The failures lead to an activation of the alternate
law with reduced protections.
Alternate law with reduced protections (Load factor
and stability augmentation) is active in ELAC 1 (or
2) if:
- double self-detected Air Data Reference (ADR)
or Inertial Reference (IR) failure or
- 2nd not self-detected ADR failure (Angle of
attack disagree) or
- double hydraulic failure B and G or Y and G or
- loss of ROLL normal law.
- Alternate law active in ELAC 1 with emergency
electrical supply (Emergency Generator
running).
ALTERNATE LAW IN ELEVATOR AND AILERON COMPUTER (Without
Protections)
Depending on the failures, the pitch channel can switch
to an alternate law without protections.
Alternate law without protection (Stability
augmentation lost, load factor protection retained)
is active in ELAC 1 (or 2) if:
- 2nd not self-detected Air Data Reference (ADR)
failure (Vcas or M disagree) or
- Triple ADR failure.
ALTERNATE LAW IN SPOILER ELEVATOR COMPUTER
After a double ELAC failure, alternate law with or
without stability augmentation, becomes active in the
Spoiler Elevator Computer.
DIRECT LAW
If the alternate law is lost, the direct law computed
in ELAC 1 or 2 becomes active.
Pitch Direct law active if:
- Dual Inertial Reference (IR) failure (2nd not
self-detected) or
- Triple IR failure or
- Failure of the Radio altimeters (when L/G
extended).
The auto trim is lost and the crew has to use the
mechanical trim.
In case of loss of both ELACs when the alternate law
is already lost, the direct law computed in SEC 1 or
2 becomes active.
MECHANICAL BACK-UP
In case of total electrical failure or loss of all
computers, pitch control can be achieved by the
mechanical trim system.
Mechanical back-up by trim wheels active if:
- All computers lost or
- Total electrical failure
The four elevator actuators are in centering mode.
TMUFCT502-T01 LEVEL 3
EFFECTIVITY 27-90-00 Page 2
Mar 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 78
ALL
PITCH CONTROL ABNORMAL D/O
TMUFCT502-P01 LEVEL 3
EFFECTIVITY 27-90-00 Page 3
Mar 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 79
ALL
PITCH CONTROL ABNORMAL D/O
PITCH LAW RECONFIGURATIONS
This diagram summarises the pitch law
reconfigurations.
TMUFCT502-T02 LEVEL 3
EFFECTIVITY 27-90-00 Page 4
Mar 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 80
ALL
PITCH CONTROL ABNORMAL D/O - PITCH LAW RECONFIGURATIONS
TMUFCT502-P02 LEVEL 3
EFFECTIVITY 27-90-00 Page 5
Mar 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 81
ALL
THIS PAGE INTENTIONALLY LEFT BLANK
TMUFCT502 LEVEL 3
EFFECTIVITY 27-90-00 Page 6
Mar 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 82
ALL
27 - FLIGHT CONTROLS
27-34-00 ELEVATOR SERVO CONTROL OPERATION
CONTENTS:
Active Mode
Damping Mode
Re-Centering Mode
Self Examination
TMUFCLK02 LEVEL 3
EFFECTIVITY 27-34-00 Page 1
Jul 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 83
ALL
ELEVATOR SERVO CONTROL OPERATION
ACTIVE MODE
When the elevator servo control is in the active mode
it is pressurized and both solenoid valves are
de-energized.
The servo valve is controlled by one computer at a
time.
TMUFCLK02-T01 LEVEL 3
EFFECTIVITY 27-34-00 Page 2
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