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R
R 1 Generalized term for range [aircraft, missile, radar
or other signal].
2 Generalized term for radius, from sheet-metal work
to aircraft mission.
3 Resistance (electrical, fluid flow, marine aircraft on
water), or resistor; see ohm.
4 Reynolds number (also Re, RN).
5 Resultant.
6 Gas constant [which see].
7 US piston-engine code: radial.
8 Aircraft category, racer (USA 1919–24, USN
1922–28); transport (USN 1931–62); helicopter (USAAF
1941–47), reconnaissance (USAF 1948–62).
9 US Navy modified-mission prefix reconnaissance,
suffix transport conversion (to 1962).
10 Generalized term for reliability, and probability
thereof.
11 Moment of resistance (also M).
12 Radiance.
13 JETDS code: radio.
14 JETDS code: receiving only, ie passive detection.
15 Revenue.
16 Restricted area (ICAO), foolowed by identifying
number, usually effective SL to 9,000 ft.
17 Received, or receive only (ICAO).
18 Repair facilities available (FAA).
19 Right, right-hand.
20 Suffix: radial (thus 234°R = VOR bearing).
21 Generalized term for rate (eg code rate, data rate,
rate of roll or turn).
22 Total rainfall.
23 Modulus of rupture.
24 US missile code for vehicle type; unguided rocket.
25 US missile code for launch environment: ship.
26 Rüstsatz, field conversion kit (G, WW2).
27 Microlight aircraft category (FAI).
28 Reject, rejected (EFIS or nav display).
29 Suffix, area navigation plus altitude-encoding
transponder.
30 Red.
31 Airport surveillance radar.
32 Route, or route-tuned (navaid).
33 Reluctance [also denoted as S].
34 Horizontal distance from the intersection with the
ground of the vertical from the point where the aircraft
starts to flare to the intersection with the ground of the
glidescope.
35 General symbol for a vertical load, usually with a
suffix.
36 Ratio [when r is unavailable].
37 Requirement [followed by system number].
r 1 Radius, or radius of rotation.
2 Suffix: required.
3 Rotational speed (eg rpm); angular velocity in roll.
4 Ratio, especially reaction * in axial compressor, or *
of bending to torsion in wing.
5 Rocket burn rate.
6 Angulat velocity, in yaw; AMSU yaw-rate output.
7 Resistivity [ρ is preferred].
8 Spherical, or cylindrical, co-ordinate.
R¯¯ In a composite panel, the ratio of 45° plies to 0°/90°.
R 0, R-zero 1 Equivalent radius of body or fuselage, = d / 2 .
2 Helicopter rotor-blade root cutout area.
R* Universal gas constant, 8.31432 J k mol -1 K -1 .
R* Radar range at which probability of detection is *
per cent.
Ṙ Range rate.
°R 1 Rankine, = 5 / 9 K.
2 Réaumur.
3 Radial [test].
R Radial [graphics].
R 2 P Repair and return packaging.
R 2 W Robot[ic] rotary wingman.
R3 Reduced ricochet [angular] range.
R 3 Reduced runway reliance, or reduced reliance on
runways.
R-12 Refrigerant 12.
R-channel Though sometimes said to mean radio, R
here means random-access. Used for air/ground
signalling and data, see Rd and Rsmc.
R-display Extended A-display enabling particular radar
echo to be magnified for close examination.
R res Range [of radar] resolution.
R-stoff Mixture of 57% crude oxide monoxylidene and
43% triethylamine (G).
RA 1 Rain (ICAO).
2 Receiver attenuation.
3 Research association(s) (UK).
4 Right ascension.
5 Reliability analysis.
6 Radio altimeter.
7 Restricted article.
8 Runway/final approach.
9 Resolution advisory; see *TA, */VSI.
10 Research announcement (Darpa).
11 Research Author (NACA, NASA).
12 Risk analysis.
13 Regional augmentation.
14 Reference axis, or [STA] altitude.
15 Rocket-assisted.
16 Relay assembly.
17 Radar summary map.
18 Radius of action.
19 Rate alarm [lightning frequency].
20 Region Aérienne (F, defence; NE, Atlantic,
Mediterranean).
21 Routing area.
22 Reportable accident.
R A Common rendering of aspect ratio.
RAA 1 Regional Airline Association [Washington, DC
20036–2422] (US).
2 Roll-augmentation actuator.
3 Regional Airport Authority (UK).
RAAA 1 Regional Airline Association of Australia.
2 Repaired and awaiting allocation (RAF).
RAAF Royal Australian Air Force.
RAAFA Royal Australian Air Force Association
[office, Sydney, NSW 1230].
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