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ETM
ETM 1 Elapsed-time measure[ment].
2 Environmental technical manual.
3 Electronic training manual [i.e., paperless].
ETMP Enhanced terrain-masked penetration.
ETMS Enhanced traffic-management system (FAA).
ETNAS Electro-level theodolite naval alignment
system.
ETO 1 Estimated time over, or overhead.
2 European theatre of operations (WW2).
ETOA European Tour Operators’ Association [2005–]
(Int.).
Etops Extended-range twin (engine) operations. Said to
translate as: engines turning or passengers swimming.
ETOS Effective time on station.
ETOT Estimated takeoff time.
ETOW Engine time on wing.
ETP 1 Equal time point.
2 Estimated time of penetration.
ETPS Empire Test Pilots’ School (originally Farnborough,
now Boscombe Down, UK).
ETPU Engine transient-pressure unit.
ETR Eastern Test Range (US).
Etrac Enhanced tactical radar correlator.
ETRAS Electrical thrust-reverser actuation system [see
next].
E-Tras Electromechanical thrust-reverser actuation
system.
ETRC Expected taxi ramp clearance.
ETS 1 Experimental test site.
2 External tank system.
3 Electronic systems test [S adds site].
4 Engineering test station.
5 Emitter targeting system.
6 Emissions Trading Scheme [January 2005-]
(European nations).
7 Embedded training simulator.
ETSC European Transport Safety Council (Int.).
ETSI European Telecommunications Standards
Institute.
ETSS Enterprise targeting and strike system.
ETU 1 External transmitter unit (IRCM).
2 Engineering Test Unit.
ETV 1 Elevating [cargo] transfer vehicle.
2 [missile] Eject test vehicle.
ETVS Enhanced terminal voice switch.
ETW European transonic windtunnel [D-51127 Köln]
(Int.).
E 2 PROM See EEPROM.
ETX End of transmission.
EU 1 European Union.
2 Ejector unit (stores carrier).
3 Electronic[s] unit [many applications].
Eu Europium.
EUA European Union emissions allowance.
EUACA European Union Airport Co-ordinators
Association (Int.).
EUAFS enhanced upper-air forecast system.
Eucare European confidential aviation reporting
network (Int.).
Euclid European co-operation for the long term in
defence (Int.).
EUEA European Union emissions allowance.
EulG K iron garnet.
Euler formula Maximum load W of strut or long column,
W = ––––
kEI
, where E is modulus of elasticity, I moment of
l 2
Europa
inertia of strut section, k constant, and 1 2 square of length
between supports.
Eulerian angles Systems of three angles which uniquely
define with reference to one co-ordinate system (Earth
axes) orientation of a second (body axes); orientation of
second system is obtainable from first by rotation through
each angle of turn, sequence being important. A singularity
at 90° became significant with the latest [Russian]
fighters.
Eulerian co-ordinators System in which properties of
fluid are assigned to points in space at each time, without
attempting to identify individual parcels from one time to
next.
EUM, Eumed European–Mediterranean Air Navigation
Region (ICAO).
Eumetsat European meteorological satellite organization
[office, D-64295 Darmstadt] (Int.).
EUMS Engine-usage monitoring system; EULMS adds
‘life’.
EUPS External uninterruptible power supply.
EUR European (ICAO).
Eur Eureka.
Eurac 1 European aircraft-cost formula (includes
landing, navigation and interest charges).
2 European Air Chiefs conference.
Euraca European Air Carrier Assembly [charter air
carriers, office, Zaventem B-1930] (Int.).
Euram European research on advanced materials
(EC7).
EURANP European air-navigation plan (ICAO).
EURATN European ATN(1).
Eureca European retrievable carrier.
Eureka Ground beacon responding to Rebecca radar
homing and distance-measuring system.
Eureka piece Fragment of wreckage showing cause of
catastrophe.
Euresco European research conference[s].
Euret European Research Programme in Transport.
EURFCB European frequency-coordinating body
(ICAO).
Euricas European Research Institute for Civil Aviation
Safety.
EUROAVIA The European Association of Aerospace
Students (Int.).
EuroCAE European Organisation [spelt thus] for Civil-
Aviation Electronics [office, Paris F-75783] (Int.).
Eurocard Standard single-sided PCB, 160 × 100 mm.
Eurocontrol The European Organization for the Safety
of Air Navigation, comprising 37 states [office, B-1130
Brussels] (Int.).
Eurocores ESF collaborative research programmes.
Eurogrid, Euro Grid Digital map with terrain overlain
by pilot-selected graphics (initially for military helicopters).
Eurogroup Informal group of European defence
ministers (NATO).
Eurohorcs European Heads of Research Councils
(1992-, Int.).
Euromep European mission equipment package (helo
night vision etc, F/G).
Europa European undertakings for research organization,
programmes and activities, an umbrella MoU
(Int.).
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