QMU  QAM Modulator Unit 
QNE  Sea Level Standard Atmosphere Pressure 
QNH  Baro Pressure Setting for en Route Altitude 
QNH  Sea Level Atmospheric Pressure 
QNH  Pressure Setting for En Route Altitude 
QNH  Sea Level Pressure 
QPL  Qualified Products List 
QRH  Quick Reference Handbook 
QSR  Quarterly Service Reports 
QSR  Quality Survey Report 
qt  Imperial quart or United States quart 
QT  Quart (US) 
QTE  True Heading to a Station 
QTY  Quantity 
QTZ  Quartz 
QUJ  True Radial from a Station 
R  Red 
R  Radius 
R  Release 
R  Rankine 
R  Reset 
R  Resistor 
R  Yaw Rate 
R  Right 
R-LMF  Right Side Local Maintenance Function 
R-OMS  Right Side Onboard Maintenance System 
RA  Resolution Advisory 
RA  Redundancy Assurance 
RA  Radio Altimeter, Radio Altitude 
RAAS  Runway Awareness and Advisory System 
RAC  Rules of the Air and Air Traffic Control 
RAC  Rotor Active Clearance 
RACC  Rotor Active Clearance Control 
RACON  Radar Beacon 
RACSB  Rotor Active Clearance Start Bleed 
RAD  Radio 
RAD  Random Access Device 
RAD  Roll Anticipation Distance 
RADCON  Radar Data Converter 
RadM  Radioactive Material 
RADVR  Random Access Digital Video Reproducer 
RAG  Repair Assessment Guidelines 
RAI  Ram Air Inlet 
RAIL  Runway Alignment Indicator Light System 
RAIMS  Radio and Audio Management System 
RALTU  Reprogrammable Annunciator Light Test Unit 
RAM  Random Access Memory 
RAPCON  Radar Approach Control 
RAS  Repair Design Approval Sheet