N
N/A Not Applicable
N2 High Pressure Rotor RPM
NAV Navigation
ND Nose Down, Navigation
Display
NDB (ADF) Nondirectional Beacon
(Automatic Direction Finder)
NEG Negative
NEUT Neutral
NL Nose Left
NLG Nose Landing Gear
NM Nautical Mile(s)
No. Number
NOPT No Procedure Turn Required
NORM Normal
NOSE, N/W Nose Wheel
NR Nose Right
NU Nose Up
O
OAT Outside Air Temperature
OB/OUTBD Outboard
OBS Observer
OEI One Engine Inoperative
OEW Operating Empty Weight
OH, OVHD Overhead
OK Okay
OM Outer Marker
OVBD Overboard
OVHT, OH Overheat
OVLD Overload
OVSP Overspeed
OVSPD Overspeed
OVTEMP Over Temperature
OXY, O2 Oxygen
P
P#6 Panel 6
P/S Pitot/Static
PA Passenger Address
PASS Passenger
PBE Portable Breathing
Equipment (Smoke Hood)
PCU Power Control Unit
PFD Primary Flight Display
PLA Power Lever Angle
PLT(s) Pilot(s)
PNLS(s) Panel(s)
PO Outside Air Pressure
POS Position
PPH Pounds Per Hour
PRESS Pressure, Pressurization
PRI/PRIM Primary
PROC Procedure
PROT Protection
PROX Proximity
PRV Bleed Pressure Regulating
and Shut-off Valve
PSI Pounds Per Square Inch
PSID Pounds Per Square Inch
Differential
PSIG Pounds Per Square Inch
Gauge
PSU Passenger Service Unit
PTCT Protect
PTT Push To Talk
PWR Power

Q
QAR Quick Access Recorder
QEC Quick Engine Change
QFE Local Station Pressure
QNH Altimeter Setting
QTY Quantity
R
R Right
RA Radio Altitude, Resolution
Advisory (TCAS)
RADALT Radio Altimeter
RAIM Receiver Autonomous
Integrity Monitor
RAT Ram Air Turbine
RAT GEN Ram Air Turbine Generator
RATLC Ram Air Turbine Line