AC
Alternating current electrical power.
REFERENCE
737 Glossary
Quick definitions for terms used throughout the systems courses.
APU
Auxiliary Power Unit.
CDS
Common Display System.
COWL
The aerodynamic engine nacelle structure surrounding the inlet and engine.
DC
Direct current electrical power.
EEC
Electronic Engine Control.
Effectivity
The specific aircraft, modification status or production range to which information applies.
FMC
Flight Management Computer.
FCOM
Flight Crew Operations Manual.
IMBAL
Fuel imbalance indication between main tanks 1 and 2.
NG
737 Next Generation family.
NGS
Nitrogen Generation System.
Pitot probe
A probe that senses total pressure for airspeed-related calculations.
Slat
A movable leading-edge lift device.
Static port
A flush opening that senses ambient static pressure.
TAI
Thermal Anti-Ice indication.
TAT
Total Air Temperature.
Ullage
The space above the liquid fuel inside a tank.
VREF
Reference landing speed calculated for the selected landing configuration.
Wing anti-ice
Bleed-air heating of the three inboard leading-edge slats on each wing.