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A time-delay relay is called a slow-closing or a slow-opening relay.
time group (air traffic control). Four digits representing the hours and minutes of Coordinated Universal
Time (UTC), based on the 24-hour clock system. In this system, the day begins at 0000 and ends at 2359,
and is the time along the prime meridian. The FAA uses UTC for all operations and identifies it as Zulu
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time, or Z time. For example, 0205Z indicates the reference time of 2:05 a.m.
The word “local” or the time zone equivalent is used when local time is given during radio and
telephone communications. When written, a time zone designator is used to indicate local time. For
example, 0205M is 2:05 a.m. mountain standard time.
time in service. 14 CFR Part 1: “With respect to maintenance time records, means the time from the
moment an aircraft leaves the surface of the earth until it touches it at the next point of landing.”
time-limited part (aircraft maintenance term). An item installed on an aircraft that must be replaced
when it has been in service for a specified number of hours.
Time-Rite indicator (engine maintenance tool). A patented maintenance tool used to locate 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 up in the cylinder, it contacts the indicator arm. A pointer and a
scale on the indicator show the number of degrees of crankshaft rotation before top center at which the
piston is located.
timing disk (engine maintenance tool). A metal disk with a 360° graduated scale marked on its face and a
weighted pointer mounted on a bearing in its center. When the disk is clamped onto the end of the propeller
shaft of an aircraft reciprocating engine, the pointer points directly upward. The disk rotates with the
propeller but the pointer continues to point straight upward and indicates on the scale the number of
degrees the shaft has rotated.
The timing disk is used with a top-dead-center indicator to position the crankshaft of the engine
for valve and ignition timing.
timing light. An indicator light used when timing magnetos to indicate when the breaker points open.
Some timing lights also incorporate an oscillator or buzzer that changes its pitch when the points open.
tin. A lustrous, silvery-white, ductile, malleable, metallic chemical element. Tin’s symbol is Sn, its atomic
number is 50, and its atomic weight is 118.69. Tin is used as a plating material for steel (tinplate) and as
one of the two major alloys in solder. Soft solder contains between 40% and 60% tin; the rest is lead.
tinned wire (electrical wire). Copper wire covered with a thin coating of tin or solder, an alloy of tin and
lead. The tin coating keeps copper from corroding and makes it easy to solder the wires.
tinner’s rivet. A flat-headed solid rivet used in commercial sheet metal work. A tinner’s rivet is driven by
holding its flat head on an anvil and peening the end of the shank with a peening hammer.
tinplate. Thin sheets of steel coated on one or both sides with a thin layer of tin.
tinsel cord. A type of extra-flexible electric cord used for the leads in headphones. Tinsel cord is made of
strips of tinsel, or metal foil, wound around a strong, flexible center cord. The tinsel and the center cord are
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enclosed in a braided cloth sheath.
tin snips. A commonly used name for hand-held metal-cutting shears. Most tin snips have short blades and
relatively long handles to give enough leverage for a person to cut fairly heavy sheet metal.
tip cap (helicopter rotor component). A removable cap mounted on the tip of some helicopter rotor
blades. These tip caps often hold the weights used for spanwise blade balance.
tip path plane (helicopter rotor). The path followed by the tip of the rotor blades as they rotate.
tip speed (helicopter rotor blade). The rotative speed of a rotor blade, measured at its tip.
tire (landing gear component). A ring, usually made of rubber or rubber compound, that fits around a
wheel and serves as a cushion at the point the wheel touches the surface over which it rolls. Most tires are
made so that they form a chamber which is filled with compressed air. The compressed air acts as a shock
absorber.
tire bead. Bundles of high-strength steel wire used as a foundation for an aircraft tire. The cords of the tire
wrap around the bead wires to tie the body of the tire to the bead. Rubber is molded around the bead wires
to form an air-tight seal with the bead seat area of the wheel.
　
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