Aviation Maintenance Terms beginning with T
Tachometer
An instrument that measures the rotational speed of an object.
Tack coat
A coat of finishing material sprayed on the surface and allowed to dry until the solvents evaporate. As soon as the solvents evaporate, a wet full-bodied coat of material is sprayed over it.
Tack rag
A clean, lintless rag, slightly damp with thinner. A tack rag is used to wipe a surface to prepare it to receive a coat of finishing material.
Tack weld
A method of holding parts together before they are permanently welded. The parts are assembled, and small spots of weld are placed at strategic locations to hold them in position.
Tacky
Slightly sticky to the touch.
Tail pipe
The portion of the exhaust system of a gas turbine engine through which the gases leave. The tail pipe is often called the exhaust duct, or exhaust pipe.
Tailets
Small vertical surfaces mounted underside of the horizontal stabilizer of some airplanes to increase the directional stability.
Takeoff Cycles
For these cycles the loads, speeds, and distance are required to conform to either Figure 1 or Figure 2.
Takeoff power
(1) With respect to reciprocating engines, means the brake horsepower that is developed under standard sea level conditions, and under the maximum conditions of crankshaft rotational speed and engine manifold pressure approved for the normal takeoff, and limited in continuous use to the period of time shown in the approved engine specification; and (2) With respect to turbine engines, means the brake horsepower that is developed under static conditions at a specified altitude and atmospheric temperature, and under the maximum conditions of rotor shaft rotational speed and gas temperature approved for the normal takeoff, and limited in continuous use to the period of time shown in the approved engine specification.
Takeoff safety speed
A referenced airspeed obtained after lift-off at which the required one-engine- inoperative climb performance can be achieved.
Takeoff thrust
With respect to turbine engines, means the jet thrust that is developed under static conditions at a specific altitude and atmospheric temperature under the maximum conditions of rotorshaft rotational speed and gas temperature approved for the normal takeoff, and limited in continuous use to the period of time shown in the approved engine specification.
Takeoff warning system
An aural warning system that provides audio warning signals when the thrust levers are advanced for takeoff if the stabilizer, flaps, or speed brakes are in an unsafe condition for takeoff.
Tandem wing configuration
A configuration having two wings of similar span, mounted in tandem.
Tang
A tapered shank sticking out from the blade of a knife or a file. The handle of a knife or file is mounted on the tang.
Tangent (tan)
A trigonometric function comparing two sides of a right triangle as follows: Tan = opposite side adjacent side Tap. Instrument used to cut threads on the inside of a hole.
Tape
A tape or a “narrow fabric” is loosely defined as a material that ranges in width from 1/4 inch to 12 inches.
Tare weight
The weight of any chocks or devices used to hold an aircraft on scales when it is weighed. The tare weight must be subtracted from the scale reading to get the net weight of the aircraft.
Taxi Cycles
The tire at rated load is required to withstand at least 8 taxi cycles on a dynamometer for a minimum speed of 40 mph and a minimum roll distance of 35,000 feet.
TCAS Potential Threat
Traffic detected by TCAS equipment on board the own-ship, that has met the Potential Threat classification criteria for a TCAS TA and does not meet the Threat Classification criteria for a TCAS RA (RTCA/DO-185B § 1.8). If the ASAS own- ship CDTI display is also used as a TCAS TA display, then information about TCAS potential threats will be conveyed to the CDTI via the ASSAP function.
TCAS Proximate Traffic
Traffic, detected by TCAS equipment on board the own-ship, that is within 1200 feet vertically and 6 NM horizontally of the own-ship (RTCA/DO-185B § 1.8). If the ASA system own-ship CDTI display is also used as a TCAS display, then information about TCAS proximate traffic will be conveyed to the CDTI, possibly via the ASSAP function.
TCAS-Only Traffic
A traffic element about which TCAS has provided surveillance information, but which the ASSAP function has not correlated with traffic from other surveillance sources such as ADS-B, ADS-R, or TIS-B.
Teflon
The registered trade name for a fluorocarbon resin used to make hydraulic and pneumatic seals, hoses, and backup rings.
Tempered glass
Glass that has been heat-treated to increase its strength. Tempered glass is used in bird-proof, heated windshields for high-speed aircraft.
Tempering
Process that reduces the brittleness imparted by hardening and produces definite physical properties within the steel. Tempering always follows, never precedes, the hardening operation.
Terminal strips
A group of threaded studs mounted in a strip of insulating plastic. Electrical wires with crimped-on terminals are placed over the studs and secured with nuts.
Terminal VOR
A low-powered VOR that is normally located on an airport.
Test club
A wide-blade, short-diameter propeller used on a reciprocating engine when it is run in a test cell. A test club applies a specific load to the engine and forces the maximum amount of air through the engine cooling fins.
Test Inflation Pressure
The pressure required at an identified ambient temperature to obtain the same loaded radius against the flywheel of the dynamometer as the radius for flat surface as defined in paragraph 7c (2) of this AC. Adjustment to the test inflation pressure may not be made to compensate for increases due to temperature rise Occurring during the tests.
Testing
Tires operating at ground speeds greater than 160 mph are required to be tested on a dynamometer. Tires operating at ground speeds of 160 mph or less may, as an option, be tested on the dynamometer in accordance with paragraph 7c (7)(111).
Tetraethyl lead (TEL)
A heavy, oily, poisonous liquid, Pb(C2H5)4 , that is mixed into aviation gasoline to increase its critical pressure and temperature.
Therapeutic mask adapter
A calibrated orifice in the mask adapter for a continuous-flow oxygen system that increases the flow of oxygen to a mask being used by a passenger who is known to have a heart or respiratory problem.
Thermal dimpling
See hot dimpling.
Thermal efficiency
The ratio of the amount of useful work produced by a heat engine, to the amount of work that could be done by all of the heat energy available in the fuel burned.
Thermal expansion
The increase in size of a material as temperature increases.
Thermal expansion coefficient
A number that relates to the change in the physical dimensions of a material as the temperature of the material changes. The thermal expansion coefficient of aluminum is approximately twice that of steel.
Thermal relief valve
A relief valve in a hydraulic system that relieves pressure that builds up in an isolated part of the system because of heat. Thermal relief valves are set at a higher pressure than the system pressure relief valve.
Thermal shock
The sudden change in engine operating temperature that occurs when engine power is suddenly reduced at the same time the airspeed, thus the cooling, is increased. Thermal shock occurs when an aircraft is required to rapidly descend to a lower altitude.
Thermistor
A semiconductor material whose electrical resistance varies with its temperature.
Thermistor
A special form of electrical resistor whose resistance varies with its temperature.
Thermistor material
A material with a negative temperature coefficient that causes its resistance to decrease as its temperature increases.
Thermocouple
A device used to generate an electrical current. A thermocouple is made of two dissimilar metal wires whose ends are welded together to form a loop. A voltage exists in the loop proportional to the difference in temperature of the junctions at which the wires are joined. The amount of current flowing in the loop is determined by the types of metals used for the wires, the temperature difference between the junctions, and the resistance of the wires.
Thermocouple
Device to convert heat energy into electrical energy.
Thermocouple
A loop consisting of two kinds of wire, joined at the hot, or measuring, junction and at the cold junction in the instrument. The voltage difference between the two junctions is proportional to the temperature difference between the junctions. In order for the current to be meaningful, the resistance of the thermocouple is critical, and the leads are designed for a specific installation. Their length should not be altered. Thermocouples used to measure cylinder head temperature are usually made of iron and constantan, and thermocouples that measure exhaust gas temperature for turbine engines are made of chromel and alumel.
Thermocouple fire-detection system
A fire-detection system that works on the principle of the rate-of-temperature rise. Thermocouples are installed around the area to be protected, and one thermocouple is surrounded by thermal insulation that prevents its temperature changing rapidly. In the event of a fire, the temperature of all the thermocouples except the protected one will rise immediately and a fire warning will be initiated. In the case of a general overheat condition, the temperature of all the thermocouples will rise uniformly and there will be no fire warning.
Thermoplastic material
A material that can be repeatedly softened by an increase in the temperature and hardened by a decrease in the temperature with no accompanying chemical change. For example, a puddle of tar on the road in the summer during the heat of day: the tar is soft and fluid; however, when cooler in the evening, it becomes solid again.
Thermoplastic resin
Atype of plastic material that becomes soft when heated and hardens when cooled.
Thermoset material
A material which becomes substantially infusible and insoluble when cured by the application of heat or by chemical means. A material that will undergo, or has undergone, a chemical reaction (different from a thermoplastics physical reaction) by the action of heat, catalysts, ultraviolet light, etc. Once the plastic becomes hard, additional heat will not change it back into a liquid as would be the case with a thermoplastic.
Thermosetting resin
A plastic resin that, once it has been hardened by heat, cannot be softened by heating again.
Thermosetting resin
A type of plastic material that, when once hardened by heat, cannot be softened by being heated again.
Thermostatic expansion valve (TEV)
The component in a vapor-cycle cooling system that meters the refrigerant into the evaporator. The amount of refrigerant metered by the TEV is determined by the temperature and pressure of the refrigerant as it leaves the evaporator coils. The TEV changes the refrigerant from a high-pressure liquid into a low-pressure liquid.
Thermostatic valve
A temperature-sensitive valve that controls the temperature of oil in an aircraft engine. When the oil is cold, the valve shifts and directs the oil through the oil cooler.
Thermoswitch
An electrical switch that closes a circuit when it is exposed to a specified high temperature.
Thixotropic agents
Materials, such as microballoons, added to a resin to give it body and increase its workability.
Three-dimensional cam
A drum-shaped cam in a hydro- mechanical fuel control whose outer surface is ground so that followers riding on the surface, as the cam is moved up and down and rotated, can move mechanical linkages to control the fuel according to a preprogrammed schedule.
Throttle
The control in an aircraft that regulates the power or thrust the pilot wants the engine to produce.
Throw (crankshaft design)
See offset throw.
Thrust
The aerodynamic force produced by a propeller or turbojet engine as it forces a mass of air to the rear, behind the aircraft. A propeller produces its thrust by accelerating a large mass of air by a relatively small amount. A turbojet engine produces its thrust by accelerating a smaller mass of air by a much larger amount.
Thrust horsepower
The horsepower equivalent of the thrust produced by a turbojet engine. Thrust horsepower is found by multiplying the net thrust of the engine, measured in pounds, by the speed of the aircraft, measured in miles per hour, and then dividing this by 375.
Time in service
With respect to maintenance time records, the time from the moment an aircraft leaves the surface of the earth until it touches it at the next point of landing.
Time of Applicability
The time that a particular measurement or parameter is (or was) relevant.
Time-Rite indicator
A patented piston-position indicator used to find the position of the piston in the cylinder of a reciprocating engine. The body of the Time-Rite indicator screws into a spark plug hole, and as the piston moves outward in the cylinder, it contacts the arm of the indicator. A pointer contacted by the arm moves across a calibrated scale to show the location of the piston in degrees of crankshaft rotation before top center.
Timing light
An indicator light used when timing magnetos to an engine to indicate when the breaker points open. Some timing lights incorporate an oscillator or buzzer that changes its pitch when the points open.
Tip
The portion of the blade outermost from the axis of propeller rotation.
Tip
Part of the torch at the end where the gas burns, producing the high-temperature flame.
Tire (Pneumatic)
A complex engineered structure made of rubber and cord (of textiles or steel) that provide a resilient protective enclosure for the inflating gas.
Tire pressure
Indicating System (Installed on an Aircraft) A system installed on an aircraft used for tire pressure checks.
Tire Test Load
The tire is required to be forced against the dynamometer flywheel at not less than the rated load of the tire during the entire roll distance of the test.
Toe-in
A condition of landing gear alignment in which the front of the tires are closer together than the rear. When the aircraft rolls forward, the wheels try to move closer together.
Toe-out
A condition of landing gear alignment in which the front of the tires are further apart than the rear. When the aircraft rolls forward, the wheels try to move farther apart.
Toggle
A T-shaped handle fitted onto the end of a cable used to engage a simple starter with an overrunning clutch.
Tolerance
The sum of the plus and minus allowance figures.
Top overhaul
An overhaul of the cylinders of an aircraft engine. The valves, pistons, and cylinders are overhauled, but the crankcase is not opened.
Toroidal coil
An electrical coil wound around a ring-shaped core of highly permeable material.
Torque
The tendency of a force to cause or change rotational motion of a body.
Torque
A force that produces or tries to produce rotation.
Torque
A force that produces or tries to produce rotation.
Torque links
The hinged link between the piston and cylinder of an oleo-type landing gear shock absorber. The torque links allow the piston to move freely in and out of the landing gear cylinder, but prevent it rotating. The torque links can be adjusted to achieve and maintain the correct wheel alignment. Torque links are also called scissors and nutcrackers.
Torque tube
A tube in an aircraft control system that transmits a torsional force from the operating control to the control surface.
Torsion rod
A device in a spring tab to which the control horn is attached. For normal operation, the torsion rod acts as a fixed attachment point, but when the control surface loads are high, the torsion rod twists and allows the control horn to deflect the spring tab.
Total air pressure
The pressure a column of moving air will have if it is stopped.
Total air temperature
The temperature a column of moving air will have if it is stopped.
Total Latency
The total time between when the position is measured by the position source (GNSS TOM for GNSS systems) and when the position is transmitted from the aircraft (ADS-B time of transmission).
Total pressure
The pressure a column of moving fluid would have if it were stopped from its motion. Total pressure is the sum of dynamic pressure and static pressure.
Total temperature
The temperature of moving fluid that has been stopped from its motion. Total temperature is the sum of static temperature and the temperature rise caused by the ram effect as the fluid was stopped.
Townend ring
A type of ring cowling used over a single-row radial engine. The cross section of the ring is in the form of an airfoil that produces enough forward thrust to compensate for the cooling drag of the engine. In the United States, townend rings are often called speed rings.
Track
The path followed by a blade segment of a propeller or helicopter rotor in one rotation.
Track
(1) A sequence of reports from the ASSAP function that all pertain to the same traffic target. (2) Within the ASSAP function, a sequence of estimates of traffic target state that all pertain to the same traffic element.
Track Angle
See Ground Track Angle.
Track State
See State Vector.
Tracking
See blade track.
Tractor engine
An engine installed with the propeller facing the front of the aircraft. Thrust produced by the propeller mounted on a tractor engine pulls the aircraft through the air.
Tractor powerplant
An airplane powerplant in which the propeller is mounted in the front, and its thrust pulls the airplane rather than pushes it.
tractor propeller
A propeller mounted on an airplane in such a way that its thrust pulls the aircraft.
Traffic
All aircraft/vehicles that are within the operational vicinity of own-ship.
Traffic Collision Avoidance System
Collision Avoidance systems which rely on transponder interrogations and replies of other airborne aircraft.
Traffic Collision Avoidance System I
TCAS I is the first generation of collision avoidance technology. TCAS I systems are able to monitor the traffic situation around an aircraft and offer information on the approximate bearing and altitude of other aircraft. It can also generate collision warnings in the form of a "Traffic Advisory" (TA). The TA warns the pilot that another aircraft is in near vicinity, announcing "Traffic, traffic", but does not offer any suggested remedy Traffic Collision Avoidance System II.
Traffic Element
An aircraft or vehicle.
Traffic Information Service - Broadcast (TIS-B)
TIS-B is a ground broadcast service provided from an ADS-B ground system network over the UAT and 1090ES links that provides position, velocity, and other information on traffic detected by a secondary surveillance radar, but is not transmitting an ADS-B position.
Traffic Information Service – Broadcast (TIS-B)
A surveillance service that broadcasts traffic information derived from one or more ground surveillance sources to suitably equipped aircraft or surface vehicles, with the intention of supporting ASA applications.
Traffic Selection
Manual process of flight crew selecting a traffic element.
Traffic Symbol
A depiction on the CDTI display of an aircraft or vehicle other than the own-ship.
Traffic-To-Follow
A term used for CAVS which is used to refer to the aircraft preceding ownship.
Trailing edge
The thin edge at the rear of a propeller blade.
Trailing edge
The rear edge of the blade where the air leaves the blade.
Trammel (verb)
To square up the Pratt truss used in an airplane wing. Trammel points are set on the trammel bar so they measure the distance between the center of the front spar, at the inboard compression strut, and at the center of the rear spar at the next compression strut outboard. The drag and antidrug wires are adjusted until the distance between the center of the rear spar at the inboard compression strut and the center of the front spar at the next outboard compression strut is exactly the same as that between the first points measured.
Trammel bar
A wood or metal bar on which trammel points are mounted to compare distances.
Trammel points
A set of sharp-pointed pins that protrude from the sides of a trammel bar.
Transceiver
A unit serving as both a receiver and a transmitter.
Transducer
A device that changes energy from one form to another. Commonly used transducers change mechanical movement or pressures into electrical signals.
Transducer
A device that changes energy from one form to another. Commonly used transducers change mechanical movement or pressures into electrical signals.
Transformer
A device that changes electrical energy of a given voltage into electrical energy at a different voltage level. It consists of two coils that are not electrically connected, but arranged so that the magnetic field surrounding one coil cuts through the other coil.
Transformer
An electrical component used to change the voltage and current in an AC circuit.
Transformer
A device for raising or lowering AC voltage.
Transformer rectifier
A component in a large aircraft electrical system used to reduce the AC voltage and change it into DC for charging the battery and for operating DC equipment in the aircraft.
Transistor
A three-terminal device primarily used to amplify signals and control current within a circuit.
Translational lift
The additional lift produced by a helicopter rotor as the helicopter changes from hovering to forward flight.
Transmitter
An electronic system designed to produce modulated RF carrier waves to be radiated by an antenna; also, an electric device used to collect quantitative information at one point and send it to a remote indicator electrically.
Transonic flight
Flight at an airspeed in which some air flowing over the aircraft is moving at a speed below the speed of sound, and other air is moving at a speed greater than the speed of sound.
Transonic range
Flight at Mach numbers between 0.8 and 1.2. In this range, some air passing over the aircraft is subsonic, and some is supersonic.
Transponder
An airborne receiver-transmitter designed to aid air traffic control personnel in tracking aircraft during flight.
Transponder
A piece of equipment carried on board an aircraft to support the surveillance of that aircraft by secondary surveillance radar sensors. A transponder receives interrogation signals on 1030 MHz and replies on the 1090 MHz downlink frequency.
Transverse crack
A crack at an angle that is not parallel to the principle direction of the outer ply, breaker, or belt.
Transverse pitch
See gauge.
Trapezoid
A four-sided figure with one pair of parallel sides.
Tread
The expendable rubber-wearing surface of any pneumatic tire. It contains the groove pattern designed to facilitate water removal from the contact patch, and may, or may not, possess integral fabric materials.
Trend monitoring
A system for comparing engine performance parameters with a baseline of these same parameters established when the engine was new or newly overhauled. Parameters such as EGT, rpm, fuel flow, and oil consumption are monitored on every flight, and the baseline is plotted. Any deviation from a normal increase or decrease warns the technician of an impending problem.
Triangle
A three-sided figure in which the sum of the three angles equal 180°.
Triangle
A three-sided, closed plane figure. The sum of the three angles in a triangle is always equal to 180°.
Tricresyl phosphate (TCP)
A colorless, combustible compound, (CH3C6H4O)3PO, that is used as a plasticizer in aircraft dope and an additive in gasoline and lubricating oil. TCP aids in scavenging lead deposits left in the cylinders when leaded fuel is burned.
Tricresyl phosphate (TCP)
A chemical compound, (CH3C6H4O)3PO, used in aviation gasoline to assist in scavenging the lead deposits left from the tetraethyl lead.
Trigonometry
The study of the relationships between the angles and sides of a triangle.
Trim tab
A small control tab mounted on the trailing edge of a movable control surface. The tab may be adjusted to provide an aerodynamic force to hold the surface on which it is mounted deflected in order to trim the airplane for hands- off flight at a specified airspeed.
Trimmed flight
A flight condition in which the aerodynamic forces acting on the control surfaces are balanced and the aircraft is able to fly straight and level with no control input.
Trip-free circuit breaker
A circuit breaker that opens a circuit any time an excessive amount of current flows, regardless of the position of the circuit breaker’s operating handle.
Troubleshooting
A procedure used in aircraft maintenance in which the operation of a malfunctioning system is analyzed to find the reason for the malfunction and to find a method for returning the system to its condition of normal operation.
True airspeed
The airspeed of an aircraft relative to undisturbed air. True airspeed is equal to equivalent airspeed multiplied by (ρ0/ρ)1⁄2.
True airspeed (TAS)
Airspeed shown on the airspeed indicator (indicated airspeed) corrected for position error and nonstandard air temperature and pressure.
True power
The power dissipated in the resistance of a circuit, or the power actually used in the circuit.
Trunnion
Projections from the cylinder of a retractable landing gear strut about which the strut pivots retract.
Truss-type structure
A type of structure made up of longitudinal beams and cross braces. Compression loads between the main beams are carried by rigid cross braces. Tension loads are carried by stays, or wires, that go from one main beam to the other and cross between the cross braces.
Tube
A gas-tight rubber device placed inside tube-type tire casings for the purpose of containing the inflation gas. It is provided with an integral valve assembly.
Tube-Type tires
Tires requiring tubes for inflation retention.
Tubeless tires
Tires not requiring tubes. These tires are constructed with an innerliner.
Turbine
A wheel fitted with vanes, or buckets, radiating outward from its circumference. The reactive or aerodynamic force caused by the fluid flowing through the vanes is converted into mechanical power that spins the shaft on which the wheel is mounted.
Turbine
A rotary device actuated by impulse or reaction of a fluid flowing through vanes or blades that are arranges around a central shaft.
Turbine engine
See gas turbine engine.
Turbine inlet guide vanes
A series of stator vanes immediately ahead of the first-stage turbine. The function of the inlet guide vanes is to divert the hot gases in the proper direction to enter the turbine, and to provide a series of convergent ducts which increase the velocity of the gases.
Turbine nozzle
Another name for turbine inlet guide vanes.
Turbo-compound engine
A reciprocating engine that has power recovery turbines in its exhaust system. The power extracted from the exhaust by these turbines is directed into the engine crankshaft through a fluid coupling.
Turbocharger
An exhaust-driven air compressor used to increase the power of a reciprocating engine. A turbocharger uses a small radial inflow turbine in the exhaust system to drive a centrifugal-type air compressor on the turbine shaft. The compressed air is directed into the engine cylinders to increase power.
Turbofan engine
A type of gas turbine engine that has a set of lengthened blades on the low-pressure compressor or low-pressure turbine. Air moved by these special blades bypasses the core engine and produces between 30% and 75% of the total thrust.
Turbojet engine
A gas turbine engine that produces thrust by accelerating the air flowing through it. A minimum of energy is extracted by the turbine, with the majority used to produce an exhaust velocity much greater than the inlet velocity. The amount of thrust produced by the engine is determined by the amount the air is accelerated as it flows through the engine.
Turboprop engine
A turbine engine in which several stages of turbines are used to extract as much energy as possible. The turbines drive reduction gears which in turn drive a propeller.
Turboshaft engine
A turbine engine in which several stages of turbines are used to extract as much energy as possible. The turbines drive shafts which are used to drive helicopter rotors, generators, or pumps.
Turbosupercharger
A centrifugal air compressor driven by exhaust gases flowing through a turbine. The compressed air is used to increase the power produced by a reciprocating engine at altitude.
Turn and slip indicator
A rate gyroscopic flight instrument that gives the pilot an indication of the rate of rotation of the aircraft about its vertical axis. A ball in a curved glass tube shows the pilot the relationship between the centrifugal force and the force of gravity. This indicates whether or not the angle of bank is proper for the rate of turn. The turn and slip indicator shows the trim condition of the aircraft and serves as an emergency source of bank information in case the attitude gyro fails. Turn and slip indicators were formerly called needle and ball and turn and bank indicators.
Turnbuckle
A component in an aircraft control system used to adjust cable tension. A turnbuckle consists of a brass tubular barrel with right-hand threads in one end and left-hand in the other end. Control cable terminals screw into the two ends of the barrel, and turning the barrel pulls the terminals together, shortening the cable.
Twist drill
A metal cutting tool turned in a drill press or handheld drill motor. A twist drill has a straight shank and spiraled flutes. The cutting edge is ground on the end of the spiraled flutes.
Twist rope
A stripe of paint on flexible hose that runs the length of the hose. If this stripe spirals around the hose after it is installed, it indicates the hose was twisted when it was installed. Twist stripes are also called lay lines.
Two-spool engine
See dual-spool gas turbine engine.
Two-stroke cycle
A constant-volume cycle of energy transformation that completes its operating cycle in two strikes of the piston, one up and one down. When the piston moves up, fuel is pulled into the crankcase, and at the same time the air/fuel mixture inside the cylinder is compressed. When the piston is near the top of its stroke, a spark plug ignites the compressed air/fuel mixture, and the burning and expanding gases force the piston down. Near the bottom of the stroke, the piston uncovers an exhaust port and the burned gases leave the cylinder. When the piston moves further down, it uncovers the intake port, and a fresh charge of fuel and air are forced from the crankcase into the cylinder.
Two-terminal spot-type fire detection system
A fire detection system that uses individual thermoswitches installed around the inside of the area to be protected. These thermoswitches are wired in parallel between two separate circuits. A short or an open circuit can exist in either circuit without causing a fire warning.
Type
(3) As used with respect to the certification of aircraft engines means those engines which are similar in design. For example, JT8D and JT8D-7 are engines of the same type, and JT9D-3A and JT9D-7 are engines of the same type.
Type Certificate Data Sheet (TCDS)
The FAA issues a type certificate when a new aircraft, engine, propeller, etc., is found to meet safety standards set forth by the FAA. The TCDS lists the specifications, conditions and limitations under which airworthiness requirements were met for the specified product, such as engine make and model, fuel type, engine limits, airspeed limits, maximum weight, minimum crew, etc
Type Certificate Data Sheets (TCDS)
The official specifications of an aircraft, engine, or propeller issued by the Federal Aviation Administration. The TCDS lists pertinent specifications for the device, and it is the responsibility of the mechanic and/or inspector to ensure, on each inspection, that the device meets these specifications.
Restrict the list to specific publications by clicking on the menubar at the top of the screen.