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Dictionary
J Route:
A route designed to serve aircraft operations from 18,000 feet mean sea level (MSL) up to and including flight level 450. The routes are referred to as "J" routes with numbering to identify the designated route; e.g. J105.
(FAA2) (FAA4)
Jack Staff:
A vertical pole erected on the lead barge of a tow used by the pilot for aligning the heading of the tow.
(TNDOT1)
Jackknife:
Jackknife can occur at any time during the crash sequence. In this report, jackknifing is restricted to truck tractors pulling a trailing unit in which the trailing unit and the pulling vehicle rotate with respect to each other.
(NHTSA3)
Jamming:
Electronic or mechanical interference which may disrupt the display of aircraft on radar or the transmission/reception of radio communications/navigation.
(FAA4)
Jeep-Like Vehicle:
Includes light trucks that are similar to jeeps. Other common terms for these vehicles are sport-utility, special purpose, utility or off-the-road vehicles. They may have a four or two-wheel drive. Previously called Jeep-Like Vehicle.
(DOE4)
Jet Down:
To sink an object, generally a buoy sinker, deep into the mud below the river bottom by the use of high pressure water jet.
(TNDOT1)
Jet Fuel:
The term includes kerosene-type jet fuel and naphtha-type jet fuel. Kerosene-type jet fuel is used primarily for commercial turbojet and turboprop aircraft engines. Naphtha-type jet fuel is used primarily for military turbojet and turboprop aircraft engines.
(BTS11)
Jet Route:
A route designed to serve aircraft operations from 18,000 feet mean sea level (MSL) up to and including flight level 450. The routes are referred to as "J" routes with numbering to identify the designated route; e.g. J105.
(FAA2) (FAA4)
Jettisoning of External Stores:
Airborne release of external stores; (e.g., tiptanks, ordnance).
(FAA4)
Jitney:
Passenger cars or vans operating on fixed routes (sometimes with minor deviations) as demand warrants without fixed schedules or fixed stops.
(FTA1)
Joint Operations:
Rail operations conducted on a track used jointly or in common by two or more railroads subject to 49 CFR 225 or operation of a train, locomotive, car or other on-track equipment by one railroad over the track of another railroad.
(49CFR225) (FRA2)
Joint-Use Airport:
A military installation at which the Department of Defense permits some degree of civil aviation use. Degrees of civil aviation use include: 1) Open to all civil aviation under a joint-use agreement 2) Joint-use agreement for limited use. Strictly military airports do not qualify for primary or commercial service status.
(FAA11)
Jumbo Barge:
A barge 35 feet wide by 195 or 200 feet long that may be either a hopper or cover-type barge.
(TNDOT1)
Junction:
Area formed by the connection of two roadways, including intersections, interchange areas and entrance/exit ramps.
(NHTSA3)
Just in Time:
Cargo or components that must be at a destination at the exact time needed. The container or vehicle is the movable warehouse.
(FHWA21)