PPI Plan Position Indicator
PWS Predictive Windshear System
QFE A method of setting the altimeter to compensate
for changes in barometric pressure and runway
elevation. Pilot receives information from airfield
and adjusts his altimeter accordingly and it will
read zero altitude at touchdown on the runway.
QNE The method of setting the altimeter to the
standard atmosphere datum -29.92 inches of
mercury (1,013.25 mb). This setting is used in the
United States airspace by all aircraft above
FL180.
QNH The more common method of setting the
altimeter to compensate for changes in barometric
pressure. Pilot receives information from airfield,
adjusts his altimeter accordingly and the altimeter
will read airfield elevation at touchdown.
RAAS Runway Awareness and Advisory System
RAIM Receiver Autonomous Integrity Monitoring
RCD Reloadable Customer Definition
RFCF Runway Field Clearance Floor
SAT Static Air Temperature
TA Terrain Awareness
TAD Terrain Alerting and Display
TCAS Traffic Collision Avoidance System
TCF Terrain Clearance Floor
TERR Terrain
TO/GA Takeoff/Go-Around
VDOP Vertical Dilution of Precision
VFOM Vertical Figure of Merit
VFR Visual Flight Rules
VG Vertical Gyro
VHF Very High Frequency
WS Windshear
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