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engaged. If an autopilot is engaged, the airplane will remain in Alternate
Law until the autopilot is disconnected.
· There are no protections provided in Direct Law, however overspeed and
stall aural warnings are provided.
· The PFD airspeed scale remains the same as in Alternate Law.
MECHANICAL BACKUP
In case of a complete loss of electrical flight control signals, the aircraft can be temporarily
controlled by mechanical mode.
· Pitch control is achieved through the horizontal stabilizer by using the
manual trim wheel.
· Lateral control is accomplished using the rudder pedals.
· Both controls require hydraulic power.
· A red MAN PITCH TRIM ONLY warning appears on the PFD.
· This table is only a summary of flight control laws, just to give you an
idea of each one.
Abbreviations & Acronyms
This is a short list of Airbus abbreviations and Acronyms.
ACM – Air Cycle Machine
ACP – Audio Control Panel, allows pilot to select which radios or interphones
to listen to.
ADIRS - Air Data Inertial Reference System, now replaced by GNADIRS
ADIRU - Air Data Inertial Reference Unit
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AMU - Audio Management Unit
ASAP – as in LAND ASAP, As Soon As Possible
A/SKID - Anti-skid
BSCU - Brakes Steering Control Unit (computer)
BTC - Bus Tie Contactor
CFDS - Centralized Fault Display System
CRC – Continuous Repetitive Chime, used to be called the fire bell.
DDRMI – Digital Distance and Radio Magnetic Indicator (RMI with DME)
DMC - Display Management Computer
DU - Display Unit (CRT, or "TV screen")
ECAM - Electronic Centralized Aircraft Monitoring
EIU - Engine Interface Unit
ELAC - Elevator Aileron Computer
EO - Engine Out
E/WD - Engine/Warning Display, upper display for aircraft systems.
FAC - Flight Augmentation Computer
FOM – Flight Ops Manual
FCU - Flight Control Unit (auto flight panel)
FMGC - Flight Management Guidance Envelope Computer, what actually
performs the computations when you type into the MCDU.
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FMGS - Flight Management Guidance Envelope System
F-Plan - Flight Plan
FPA - Flight Path Angle
FWC - Flight Warning Computer
FWS - Flight Warning System
GCU - Generator Control Unit
GLC - Generator Line Contactor
GNADIRS – Global Navigation Air Data Inertial Reference System, GPS,
Air Data information and Inertial attitude/guidance all in one.
Green Dot – Best L/D (lift over drag) speed, normally used as the target
speed at end of takeoff or for single engine climb out. Technically called
VFTO (Final Takeoff Speed). On the Airbus a green dot on the airspeed scale.
IDG – Integrated Drive Generator (the old CSD and generator all in one unit)
INIT – Initialization
L/G - Landing Gear
LGCIU - Landing Gear Control Interface Unit
LSK - Line Select Key (keys used on MCDU screen)
MCDU - Multipurpose Control and Display Unit
MMR – Multi Mode Receiver, the GPS receiver for the GNADIRS, two are
installed
ND - Navigation Display
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N/W – Nose Wheel
pb – pushbutton
PF – Pilot Flying, the person actually handling the control or autopilot input.
PFD - Primary Flight Display (the display you will look at the most, has
airspeed, altitude, attitude, heading and more)
PH – Pilots Handbook
PM – Pilot Monitoring, the non-flying pilot, used to be called PNF (Pilot Not
Flying).
PTU – Power Transfer Unit, pump that is able to transfer power (but not
fluid) between the green and yellow hydraulic systems
QRH – Quick Reference Handbook
RAT - Ram Air Turbine, an air driven backup pump for blue hydraulic
RMP - Radio Management Panel, allows pilot to select which radio to tune or
transmit on.
SD - System Display, lower display for aircraft systems.
SDAC - System Data Acquisition Concentrator
SEC - Spoiler Elevator Computer
SFCC - Slat/Flap Control Computer
SRS - Speed Reference System
THS - Trimmable Horizontal Stabilizer
TLA - Thrust Lever Angle, the TLA indicator is a white “donut” on the N1
gauge.
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TOGA – Takeoff Go Around. Highest selectable thrust level. Selected by
putting thrust levers in TOGA detent. Also a mode for the Flight Director.
TRU - Transformer Rectifier Unit, also known as TR, transformer rectifier
UTC - Universal Coordinated Time (a politically correct way to say Zulu or
GMT)
VFTO – Final Takeoff Speed, normally called “Green Dot”, best lift / drag
WHC – Window Heat Computer
WTB – Wing Tip Brake
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