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ER
tion to ratio of average beam load at that section to
average beam load at section taken as standard.
ER 1 Extended-range.
2 Enhanced radiation.
3 Echo reply.
4 Essential requirements.
5 Expanded Response [SLAM].
E/R Extend/retract.
Er Erbium.
ERA 1 European Regional Airlines Association [offices
at Geneva and Fairoaks Airport GU24 8HX, UK] (Int.).
2 Elastic recoil analysis, for hydrogen content.
3 En-route [radar] array.
4 Explosive reactive armour.
5 Employment relations act (UK 1999).
6 European Research Area (Int.).
7 European Robotic Arm [ISS].
8 Electrical Research Association (UK).
ER-AAM Extended-range air-to-air missile.
ERAAS Extended-range autonomous attack system
(UAV).
eradiation See Earth radiation.
ERAM 1 Extended-range anti-tank mine (or antiarmour
munition).
2 En-route automation modernization (FAA).
ERAQ European Regional Airline Organization (Int.).
ERAP 1 Earth-resources aircraft program (US).
2 Enhanced range applications program (USAF).
ERAPDS Enhanced recognised air picture dissemination
system.
ERAPS, Eraps Expendable reliable-acoustic-path
sonobuoy.
erase In EDP (1) to expunge stored information, usually
without affecting storage medium.
ERASL Enhanced recognition and sensing lidar.
Erasmus En route air-traffic management ultimate
system (Honeywell, EU).
Erast Environmental research aircraft and sensor technology
(NASA).
E-Rast Expendable Rast.
Erat En-route absorption of (expected) terminal delay.
ERATS, Erats En route advanced, or automated,
tracking system.
ERAU Embry-Riddle Aeronautical University
[Daytona Beach, FL32114-3900; Prescott, AZ 86301-
3720] (US).
ERB 1 Executive, and also Engineering, Review Board.
2 Executive responsibility budget.
3. Earth radiation budget.
erbium Bright silver metal, Er, density 9.1, MPt 1,529°C,
important in optics [especially optical fibres] and in eyesafe
Er-glass lasers on 2.9 μ.
erbium silicide One of the favoured materials currently
used for fabricating nanowires.
ERBM Electronic range/bearing marker.
ERBS Earth radiation budget system, later satellite.
ERC 1 Electronics Research Center, NASA,
Cambridge, Massachusetts.
2 Extended runway centreline.
3 Engine-related causes.
4 En route chart.
ERCA Etablissments Régional du Commissariat de
l’Air (F).
ERCC 1 En-route control centre.
ERO
2 Engine Requirements Co-ordinating Committee
(CAA).
ERCS 1 Emergency rocket communications system.
2 Enhanced radar cross-section (UAV decoy).
ERCE Escadrille de Réception et de Convoyage Equipe
[crew ferry flight unit] (F).
ERD End-routing domain.
ERDA 1 Energy Research and Development Administration
(US).
2 European Regional Development Agency.
3 En Route Descent Adviser (NASA).
ERDE Explosives Research and Development
Establishment (formerly at Waltham Abbey, UK).
ERDI ERD infrastructure.
ER/DL Extended-range, data link.
ERE External roll extrusion.
EREA European research establishments in aeronautics,
or for aerospace, launched 2001 with seven members.
erect 1 Not inverted, vertical acceleration +1g.
2 To restore a horizon or standby horizon to give
correct indication after upset.
erection 1 Assembly and rigging of aircraft from
component parts or from dismantled state; eg after crated
shipment.
2 Of gyro, acceleration from rest to operating speed
with axis in desired alignment. (Thus re-*, to restore
proper axis alignment after being toppled.)
erector transporter Vehicle used to convey ballistic
rocket, elevate it for firing and act as launcher; also known
as transporter erector.
E-region Region of ionosphere in which E-layers and
Sporadic E-layer tend to form.
EREL Elevated runway-edge light.
ERFA Conference on Economics of Route Air
Navigation Facilities and Airports.
ERFCS Extended-range fuel containment system
[= tank].
ErG Erbium-glass.
erg Unit of energy in CGS (not SI) system; work done
by force of one dyne acting through distance of 1 cm =
10 –7 J.
ERGM Extended-range guided munition (USA, USN).
ergometer exerciser Device for exercising astronauts on
long missions and measuring muscular work.
ERGP Extended-range guided projectile.
ERHA En-route high-altitude; C adds chart.
Erint Extended range-interceptor.
ERIS, Eris Exoatmospheric re-entry vehicle interceptor
system.
ERJ External-combustion ramjet; one in which airflow
and combustion are outside vehicle with profiled exterior
surface.
erk RAF slang (WW2) for airman ground crew
possessing minimal skills and lowest rank (AC2 or ACH).
ERL 1 Environmental Research Laboratories (NOAA).
2 Electronics Research Laboratory (Australia).
ERLA En-route low-altitude; C adds chart.
ERMA, Erma Extended-red multi-alkali (Gen II image
intensifiers).
ER/MP Extended-range, multipurpose.
ERMR Economic Regulation and Multilateral
Relations (European Commission).
E rms Root mean square voltage.
ERO Engine repair and overhaul.
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