Alpha
Bismillah
Charlie Delta
Echo
Foxtrot
Golf
Hotel
insaallah Juliett
Kilo
Lima
Mike November Oscar
Piaggio Quebec Romeo
Sierra Turks Uniform
Victory Water X-ray
Yankee Zulu Main Page
Jamming
JAMMING
jack pads
Structural locations capable of supporting the weight of an aircraft when being jacked from the ground.jacket A metal blanket or shroud used to insulate a portion of a turbine engine.
jacks The hydraulic or mechanical devices used to lift an aircraft off of the ground for testing or servicing.
jackscrew A threaded, hardened steel rod that can be rotated to lift an object or to apply a force.
jagged edge An irregularly shaped edge on a piece of metal, wood, or plastic material.
jam acceleration The rapid movement of the power control lever of a gas turbine engine. Done when measuring the RPM acceleration rate.
jam nut A thin check-nut screwed down against a regular nut to lock it in place.
jamming Electronic or mechanical interference that can disrupt the display of aircraft on radar or the transmission/ reception of radio communications/navigation.
J-block A precision block ground to an accuracy of approximately 0.00001 , used as a reference in precision machining operations.
jerry can A specially designed five gallon container used for carrying fuel.
jet 1. A calibrated, restricted orifice in the fuel passage of a carburetor used to control the amount of fuel that can flow under a given pressure. The size of the hole (jet) determines the amount of flow through the jet. 2. A forceful stream of fluid discharged from a small nozzle. 3. An aircraft powered by a turbojet engine. 4. The hot, high velocity gas stream issuing from the tailpipe of a gas turbine engine.
Jet A-1 A kerosene-type turbine engine fuel similar to the military JP-8 fuel with additives to make it usable at very low temperatures of approximately -58 F.
Jet A A kerosene-type turbine engine fuel similar to the military JP-5. It has a very low vapor pressure and a relatively high flash point.
Jet Assist Takeoff (JATO) An auxiliary means of assisting a heavily loaded aircraft to takeoff, particularly on a short runway. The JATO consists of small rockets attached to the aircraft and provides the required additional thrust needed for takeoff.
Jet B A wide-cut blend of hydrocarbon fuels for use in turbine engines. Used primarily in the military as JP-4 fuel.
jet blast
Jjet blast Jet engine exhaust (thrust stream turbulence).
jet efflux The gas flowing from the exhaust nozzle.
jet engine A reaction engine that derives its thrust from the acceleration of an air mass through an orifice. There are four common types: rocket, ramjet, pulsejet, and turbojet.
jet fuel control (JFC) The fuel metering system for a turbine engine. Measures the operating conditions of the engine and meters into the burners the correct amount of fuel for the condition.
jet nozzle A specially designed device shaped to produce a jet stream.
jet nozzle area The area in square feet of the opening through which the engine exhaust gases pass to the atmosphere.
jet propulsion The propulsion produced when a relatively small mass of air is given a large amount of acceleration
jet pump A pump that operates by producing a low pressure through a venturi. Seen in oil scavenge systems as oil pumps and fuel systems as vapor eliminators.
jet route A route designed to serve aircraft operations from 18,000 feet 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.
jet silencer A device used to reduce and modify the lower frequency sound waves emitting from an engine s exhaust nozzle, and thus reducing the noise factor.
jet streak A portion of the jet stream where wind speeds are greater than in regions up- or downstream. Jet streaks are several hundred to 1,000 miles long.
jet stream A narrow band of high speed winds (speeds exceed 60 knots). Normally found near the tropopause.
jet stream axis The line of maximum winds (>60 knots) on a constant pressure chart.
jet stream cirrus Associated with an extratropical cyclone, these anticyclonically curved bands of cirrus clouds are usually located just downstream of the upper trough.
jet stream front High-level frontal zone marked by a sloping layer below the jet core.
jet thrust The thrust produced by a jet.
Jetcal analyzer A trade name for an electronic test apparatus for checking the calibration of the EGT system, the RPM system, and the accuracy of their associated instruments.
jettison To cast off or drop from an aircraft in flight.
jettisoning of external stores Airborne release of external stores; e.g., tiptanks, ordnance.
jewel bearing A cup-type bearing surface that rides on a hardened steel pivot used extensively in many types of indicating instruments.
jeweler s rouge A very fine ferric oxide abrasive used for polishing hard metal surfaces.
jig The framework or alignment structure used in the construction or repair of an aircraft to hold all the parts in proper alignment while they are fastened together.
jigsaw An electric or pneumatically operated saw tool that uses a variety of narrow blades to cut small curves in wood, metal, or plastic.
Jo-bolts An internally threaded three-piece rivet.
joggle A small offset in sheet metal formed to allow one part to overlap another.
Johnson bar A brake control found on some early airplanes. A Johnson bar consisted of a long bar mounted between the seats in the cockpit that, when pulled rearward, applied both main wheel brakes and, when pulled diagonally rearward, applied one of the brakes.
JP-4
JP4 JP5 JP6 JP7joint use restricted area See restricted area.
jointer An electrically powered woodworking machine used to smooth the edges of wood.
joule The international system unit of energy equal to the work done when a current of 1 ampere is passed through a resistance of 1 ohm for 1 second.
joule rating A turbine engine s ignition system.
journal The polished surface of a crankshaft on which the bearings ride.
joystick A slang term used for the control stick that controls an airplanes ailerons and elevator. Moving the joystick fore and aft moves the elevators, and moving the joystick side to side moves the ailerons.
JP-4 A gas turbine engine kerosene-type fuel made up of approximately 65% gasoline and 35% distillates. Also referred to as Jet B.
JP-5 A highly refined gas turbine kerosene-type engine fuel. Also referred to as Jet A.
JP-7 A gas turbine engine kerosene-type fuel with additives for use at extremely high altitudes.
judgment Process of recognizing and analyzing information, evaluating alternative actions, and making a timely decision on action to take.
jumbo
jumbo jets The name given to wide-body airplanes such as the Boeing 747, 757, 767, 777, McDonald Douglas DC-10, Lockheed L-1011, A-300 Airbus, etc.
jump seat A compact portable seat positioned slightly behind the pilot s and copilot s seats in an airplane where a flight engineer sits to monitor certain engine-operating instruments and operate some of the auxiliary controls.
jumper A temporary electrical lead wire used to bypass a circuit for purposes of troubleshooting.
junction The point at which two conductors or circuits join.
junction box A metal or fiberglass box for holding the electrical terminal strips to which wire bundles are attached.
Junction Field Effect Transistor (JFET) A semiconductor device that uses voltage to control conductivity instead of current as in the normal transistor.
junction transistor A transistor consisting of a single crystal of P- or N-type germanium between two electrodes of opposite types. The center layer is the base and forms junctions with the emitter and collector.
