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R-Nav, RNAV, R-nav
known by ship name (prefaced HMS), usually name of
seabird.
2 Royal Naval Air Service [1 July 1914–1 April 1918,
when amalgamated with RFC].
R-Nav, RNAV, R-nav Area navigation, can have RNPC
added.
RNAY Royal Naval Aircraft Yard.
RNDZ Rendezvous.
RNEFTS Royal Navy Elementary Flying Training
Squadron.
RNEP Robust nuclear earth penetrator (DoD).
RNF Radio navigation facilities.
RNG Radio range (ICAO, FAA).
RNGA Range arc.
RNGSA Royal Naval Gliding and Soaring Association.
RNHF Royal Navy Historic Flight.
RNI Russian research institute, IKP adds spaceinstrument
making.
RNII Reaction-engine scientific research institute
(USSR, R).
RNIP Ring-laser gyro navigation improvement
programme.
RNLAF Royal Netherlands air force [UK usage].
RNLN Royal Netherlands navy [UK usage].
RNMP Replacement of the nautical-mile panel
(ICAO).
RNoAF Royal Norwegian air force [UK usage].
RNP Required navigation performance, defined as
maximum expected en-route error; /ANP adds actual
navigation performance, AP adds authorisation required;
C or -C adds capability, -5 means accuracy ≤5 nm (9.3 km)
95% of time; the main effort is on extending coverage of
RNP-4.
RNPU Radar-navigation processing unit.
RNR Receive[r] not ready.
RNS 1 Radar-navigation service, or system.
2 Regular use by non-scheduled carriers.
RNSFC Royal Naval School of Fighter Control.
RNTP Radio-navigation tuning panel.
rnwy Runway.
RNZAC Royal New Zealand Aero Club [office,
Wellington].
RO 1 Range-only memory.
2 Radio, or radar, operator.
3 Royal Ordnance (UK).
4 Rollout.
5 Report when over runway.
6 Routeing organization.
7 Receive only.
8 Rotorcycle category (USN, 1954–59).
R/O Radio officer.
R o 1 Radar range at which signal/noise ratio is 1.
2 Range to a patch or mapped swath.
ROA 1 Return on assets.
2 Remotely-operated aircraft.
3 Radius of action.
4 Recognised operating agency.
roach Wake of marine aircraft when deep in water;
characterized by dense, almost vertical up-flow immediately
behind float or hull.
ROAD Retired on active duty.
roadable aircraft One which, usually after some alteration,
can be driven on public highway as a car.
roadmap Graphical plot, usually with time as X-axis,
rocket
giving pictorial overview of a programme, input efforts,
available technologies or other variables.
Roadstead Code name for attacks on enemy ships at sea
(RAF, WW2).
roaks Cavities in steel castings caused by carbon
monoxide.
ROB 1 Right outboard.
2 Radar order of battle.
rob See next entry, derived verb.
robbery action Procedure whereby serviceable part is
taken from aircraft or assembly in order to get the latter
back in service (not cannibalization because * is
temporary).
Robe, ROBE Roll-on beyond line-of-sight enhancement,
or extension.
Robeps Radar is operating below performance standard[s].
Robex Regional Opmet bulletin exchange.
Robin Radar observation of bird intensity.
Robinson anemometer Standard three or four-cup, with
worm drive.
robot In addition to usual meaning, guided missile
(Sweden).
robotics Use of intelligent machines to replace human
beings in routine mechanical tasks.
robot rotary wingman UAV helicopter able to fly fast at
low level accompanying manned helicopter, see VCAR
(Darpa).
robustness Unquantifiable quality of a flight-control
system to continue to function in face of uncertainties or
failure in actuator, airframe or sensor input, especially
despite dangerous conditions such as uncommanded
hardover surface deflection.
ROC 1 Rate of climb.
2 Required, or rate of, operational capability
(pronounced rock).
3 Royal Observer Corps (UK, civilian NW/fallout
monitoring organization).
4 Receiver operating characteristic (ASW).
5 Reconfigurable orbital cockpit.
ROCC Region(al) (or range) Operations Control
Center (Norad, SSS).
Rocets Rocket-engine transient simulation.
Roche’s limit Critical radius from primary within which
planetary satellite cannot form; equal to 2.44 times radius
of primary.
rock 1 Uncommanded excursion or oscillation in roll.
See SIWR.
2 Rotary movement of wing[s] relative to fuselage,
usually in plane perpendicular to longitudinal axis, caused
by worn root anchor pins and various other faults (usually
old GA aeroplanes) Not to be confused with wing rock.
3 To move throttle lever[s] laterally.
rockair Small high-altitude sounding-rocket technique
involving launch from aircraft, eg jet fighter, in vertical
attitude at high altitude (probably arch.).
Rock apes RAF Regiment (colloq.).
Rockbestos Synthetic fire/electricity insulator.
rocker arm See-saw arm pivoted to piston engine
cylinder head transmitting push-rod actuation to valve(s).
Hence rocker box, enclosing valve gear.
rocket 1 Propulsion system containing all ingredients
needed to form its jet, or vehicle thus propelled. Most
involve combustion, but examples which do not are
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