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