RVSM
Real-Time Vertical Safety Measure
Radar Vertical System Management
Reduced Vertical Separation Minimum
Required Vertical Space Monitoring
NOTAM
Navigation Over Terrain and Maps
Notice of Temporary Airspace Movement
Notice to Airmen
Notification of Air Traffic Management
STAR
Secondary Traffic Area Regulation
System Tracking and Radar
Standard Terminal Arrival Route
Standardized Tracking and Approach Route
MNPS
Mandatory Navigation Procedures and Standards
Maximum Navigation Performance System
Multi-Navigation Pilot Specification
Minimum Navigation Performance Specification
TCAS
Terrain and Cloud Avoidance System
Traffic Collision Avoidance System
Tactical Communication and Alert System
Traffic Control Advisory Signal
ETOPS
Engine Takeoff Optimization Procedure Standard
Extended-range Twin-engine Operational Performance Standards
Emergency Takeoff and Operational Protocol System
Extended Twin Operations Procedure Standard
RNP
Real-time Navigation Positioning
Restricted Navigation Pathway
Regional Navigation Procedures
Required Navigation Performance
SID
Secondary Instrument Display
Station Identification Data
Standard Instrument Departure
System Integration Design
ICAO
Independent Civil Air Operations
Instrument Control and Operations
International Cargo Air Operations
International Civil Aviation Organization
METAR
Meteorology and Aviation Resource
Measurement of Aeronautical Runway
Mission Event Traffic and Reports
Meteorological Aerodrome Report
ATIS
Aviation Training and Information System
Aircraft Traffic Inspection System
Automatic Terminal Information Service
Air Traffic Indicator System
ILS
Independent Landing Signal
Integrated Landing Standard
Instrument Landing System
International Light System
IFR
Instrument Flight Rules
Initial Flight Routing
In-Flight Regulations
International Flight Reference
APU
Aircraft Propulsion Unit
Auxiliary Power Unit
Automatic Pilot Utility
Air Pressure Utility
PBN
Performance-Based Navigation
Pilot-Based Navigation
Predictive Beacon Network
Precision-Based Network
EGPWS
Engine Ground Propulsion Warning System
Emergency Ground Power and Weather Station
Enhanced Ground Proximity Warning System
Electronic Ground Procedure Warning Signal
VFR
Vertical Flight Regulation
Visual Field Reference
Visual Flight Rules
Vector Following Radar