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JTSTR
JTSTR Jetstream.
JTT 1 Joint tactical terminal.
2 Joint Trials Team.
JTTRE Joint Tropical Trials and Research
Establishment (Australia).
JTUAV Joint [-service] tactical UAV.
JTW Joint targeting workstation.
JTWG Joint Targeting Working Group (NATO).
JU Joint undertaking.
J-Ucas Joint unmanned combat air system[s]
(USAF/USN).
Judy 1 Interceptor has contact and is assuming control
of engagement (US).
2 Target in practice interception: I have been hit (UK).
3 See Contact*.
JUEP Joint UAV experimental programme (UK).
JUG Joint Users Group.
jug 1 Piston-engine cylinder.
2 Drop tank (both meanings colloq.).
JUKL ATC association (Yugoslavia, Serbia).
Julie/Jezebel ASW system based on Julie plotting target
position from echoes from ≤60 explosive charges detected
by Jezebel.
Jumbo, jumbo jet Boeing 747.
Jump Joint upgrade [and] maintenance programme
(RAF).
jumper Cable temporarily attached to terminals to
bypass part of electric power circuit.
jump jet Jet VTOL aircraft (colloq.).
jumpliner STOL transport (colloq.).
jumpmaster Person in command of stick of parachutists.
jump seat, jumpseat Extra seat in cockpit or on flight
deck not required by flight crew, but possibly occupied by
authorized member of aircraft crew such as loadmaster.
jumpseater Anyone occupying jump seat, eg passenger
invited to flight deck (rare after ‘9-11’).
jump strut gear Main or (usually) nose landing gear
capable of forcible extension to reduce TO ground roll of
STOL aircraft.
jump takeoff 1 Autogyro takeoff using stored rotor
energy to achieve initial lift at zero airspeed.
2 Jet VTO.
JWTC
3 Launch of anti-tank missile with initial jump to operating
height.
junction Mating surface between different types (eg p
and n) of semiconductor material.
jungle penetrator SAR device lowered into dense jungle
by helicopter.
Jungly Assault-transport helicopter, especially crewmember
thereof (UK).
Junkers double wing Plain flap mounted entirely aft of
wing trailing edge.
junkhead Head of sleeve-valve cylinder.
junkhead ring Gas sealing ring between head and sleeve.
JUP Joint university program.
JURA Joint-use restricted area.
jury strut 1 Additional or temporary strut for particular
short-term purpose.
2 Short strut joining mid-point of main wing strut to
wing.
Jusmag Joint US Military Advisory Group.
juste retour Division of workshares according to a
partner-nation’s investment, or commitment to purchase.
The Eurofighter programme is the first in which this
philosophy is no longer being applied.
Juxco Joint unexploded ordance co-ordinating office.
JV 1 Joint venture.
2 Jettison vehicle [missile test].
JVATF Joint Vertical Airlift Task Force (DoD, August
2003–).
JVC Jet-vane control.
JVMF Joint variable message format.
JVX Joint-services advanced vertical lift aircraft (US).
JWA Jointed-wing aircraft (microlight).
J-Warn Joint warning and reporting network.
JWC 1 Joint Warfighting Center (JFCOM, Suffolk,
VA).
2 Joint warfare capabilities.
JWE Joint Warfare Establishment, Old Sarum [closed].
JWI Joint Warrior, or warfare, interoperability; D adds
demonstration.
JWIS Joint Weather Impact[s] System (USAF).
JWTC Joint Warfare Training Centre (Northwood,
UK).
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