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EROC
EROC En-route obstacle clearance study group.
Erom Erasable ROM.
Erops, EROPS Extended-range operations, same as
Etops.
EROS, Eros 1 Earth Resources Observation Systems
(US Geological Survey).
2 Earth-resources orbiting satellite.
3 Earth remote observing system.
erosion gauge Instrument for measuring erosion by dust
and micrometeorites on materials exposed to space environment.
ERP 1 Effective radiated power.
2 Eye reference point.
3 Excitation [or exciter] receiver processor.
4 Enterprise resource planning, or process.
ER-PDU Echo reply protocol data unit.
ER-PGB Extended-range precision guided bomb.
ERPM Engine rpm [normally of helicopter].
Erprobungsstelle Proving (test) centre (G).
ERQ-PDU Echo request protocol data unit.
ERR Early risk-reduction
ERRB Enhanced radiation, reduced blast.
error 1 In mathematics, difference between true value
and calculated or observed value.
2 In EDP (1), incorrect step, process or result, whether
due to machine malfunction or human intervention.
3 In air/ground bombing or photography, various definitions
mainly concerned with linear miss-distance.
error band Error value, usually expressed in per cent of
full-scale, which defines maximum allowable error
permitted for specified combination of transducer
parameters.
error signal Voltage proportional to difference between
actual and desired condition. Thus, in radar, ** obtained
from selsyns and AGC circuits and used to control servo
to correct error.
ERS 1 Earth-resources satellite.
2 Error-recovery service message (networks).
3 En-route supplement.
4 Emergency radio switching [system].
5 Electronic resource system.
6 Earth remote surveillance.
ERs Essential requirements (EASA).
ersatz Substitute material (G).
ERSDS En-route software development and support
(FAA).
ERSU Environmental remote-sensing unit.
ERT 1 Elevator rigging tool.
2 Extended-range tank.
3 Earth-receive time [signal from planet].
ERTS Earth-resources technology satellite.
ERU 1 Ejector release unit for external stores.
2 Emergency reaction unit (USAFSS).
3 Engine relay unit.
ERV Expendable rocket vehicle.
Ervis Exoatmospheric re-entry vehicle interception (or
interceptor) system (SDI).
ERW Enhanced-radiation (neutron) weapon.
ER-WCMD Extended-range wind-corrected munitions
dispenser.
ERWE Enhanced radar-warning equipment.
ES 1 Escape slide.
2 Expert systems (artificial intelligence).
3 Electronically scanned.
escape slide
4 Electrostatic.
5 Electronic support.
6 End system.
7 Extended squitter.
8 Evolution strategy [algorithm].
E s 1 Specific energy, h + v 2 /2g.
2 Secant modulus.
ES1, ES2 Radar antenna with electronic scanning
about 1 or 2 axes, respectively.
ESA 1 European Space Agency [17 members; office, F-
75738 Paris Cedex 15] (Int.).
2 Enhanced signal average.
3 Electronic signature authentication.
4 Engineering source approval.
5 Electronically scanned, or steered, array.
6 Enhanced [or electronic] situation[al] awareness [S
adds system].
7 Embedded/special application, also E/SA.
ESAD 1 Equivalent still-air distance.
2 Electronic safe/arm device.
ESAA Electronic-scanning array antenna.
ESAF Electronic safety arming and fuzing.
ES&DF Electronic support and direction finding.
ESAR Enhanced synthetic-aperture radar.
ESARR Eurocontrol safety regulatory requirements.
ESAS 1 Electronically steerable antenna system.
2 See ESA (6).
3 Exploration systems architecture study (NASA).
ESASC EEA/SBAC Avionics Systems Committee.
ESB Elevating sliding bridge, simpler than apron-drive
type of airbridge.
ESC 1 European Space Conference.
2 Executive steering committee.
3 Engine supervisory control.
4 Energy storage [and] control.
Escadre Wing (military unit, F).
Escadrille Flight (military unit, F).
Escadron Squadron (F).
escalation 1 Increase in scope, violence or weapons of
conflict.
2 Increase in cost due to incorrect cost estimation, inflation,
advances in technology, changes in specification or
other factors.
E-scan Electronically scanned array.
escape To achieve velocity and flightpath outward from
primary body sufficient neither to fall back nor orbit.
escape capsule See ejection capsule.
escape chute Near-vertical chute forming part of structure,
entered by opening pressure door in floor of crew
compartment. Not to be confused with escape slide.
escape hatch Hatch in aircraft, usually jettisonable,
intended for use in abandoning aircraft; ventral for use in
flight, dorsal after belly landing or ditching.
escape manoeuvre 1 Several predetermined manoeuvres
to evade hostile triple-A.
2 Maximum-rate manoeuvres to avoid CFIT.
3 Trajectory of spacecraft departing from Earth or
evading planet [not normal usage].
escape orbit Any of several paths body escaping from
central force field must follow in order to escape.
escape rocket Small rocket used to accelerate and
separate payload near pad following launch-vehicle
malfunction.
escape slide Rapid-inflation pneumatic channel
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