CAP 413 Radiotelephony Manual
Chapter 1 Page 9
OCA/H Obstacle Clearance Altitude/Height
OPC Operational Control Communications
OCU Operational Conversion Unit (M)
P
PAPI* Precision Approach Path Indicator (pronounced PAPI)
POB (Total) Persons on Board
PAR Precision Approach Radar (M)
Q
QDM Magnetic heading (zero wind) (Sometimes employed to indicate
magnetic heading of a runway)
QDR Magnetic bearing
QFE Altimeter subscale setting to indicate height above either aerodrome
elevation, or threshold elevation, or helideck elevation
QNE Landing altimeter reading when subscale set 1013 hectopascals
QNH Altimeter subscale setting to indicate elevation (AMSL) when on the
ground and altitude in the air
QTE True Bearing
R
RA Resolution Advisory (see TCAS)
RCC Rescue Co-ordination Centre
RPS Regional Pressure Setting
RTF Radiotelephone/Radiotelephony
RVR Runway Visual Range
RVSM Reduced Vertical Separation Minima (pronounced Ahh Vee Ess Emm)
S
SAR Search and Rescue
SBAS* Satellite-based augmentation system (pronounced ESS-BAS)
SID* Standard Instrument Departure
SIGMET* Significant information concerning en-route weather phenomena which
may affect the safety of aircraft operations
SRA Surveillance Radar Approach
SSR Secondary Surveillance Radar
17 November 2011
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