turn indicator

Also found in: Dictionary, Thesaurus, Wikipedia.
Related to turn indicator: Turn and bank indicator

Turn Indicator


an aircraft gyroscopic device that indicates the deviation of an aircraft from a straight-line course.

A turn indicator is based on the ability of a gyroscope with two degrees of freedom to superpose the angular velocity vector of the gyroscopic rotor’s own spin and the angular velocity vector of the rotation of the device’s case. The spin axis of a turn indicator’s rate gyroscope is horizontal and at a right angle to the fore and aft axis of the aircraft; the axis of the gimbal in which the rotor spins is parallel to the longitudinal axis of the aircraft. Unlike a compass, a turn indicator responds only during a turn. The angle of deviation of the gyroscopic gimbal and the pointer connected to it depends on the aircraft’s turn rate. (See alsoGYROSCOPE.)

turn indicator

An instrument that displays the aircraft's rate and direction of turn. See turn and slip indicator.
References in periodicals archive ?
Instruments available for spatial orientation by 1932 included the inclinometer, turn indicator, climb indicator, air speed indicator, spinning top, Sperry Artificial Horizon, Sperry Directional Gyro, the pitch-azimuth indicator, the flight integrator (described below), and the Air-I-Zon (an early version of angle-of-attack).
And then there is Lane Departure Warning (which alerts drivers if the vehicle runs across the lane markers without the turn indicator being used) and active Bi-Xenon lights that "see around corners" and numerous secondary safety features.
Just on sale and priced from pounds 14,463, the 2010 Auris also has new 16-in and 17-in alloy wheels and turn indicator lights integrated into the door mirrors.
If I am following your car and I see first your brake light and later the turn indicator while you are turning, how are you helping me respond safely to your maneuver?
The all new Maruti Suzuki SX4 has new looks, and also brings new features such as touch screen audio navigation and electronically foldable ORVMs with turn indicator.
New 16 or 17in alloy wheels are fitted and turn indicator lamps have been added to the door mirrors.
Regarding Michael Alex's letter (Public Forum, May 24) on the subject of Los Angeles freeway drivers not using their turn signals: I remember once, years ago, my son-in-law Rob, who drives the freeways constantly and for hours on end, advising, if you use your turn indicator to change lanes, it just signals drivers in the other lanes that they should speed up and close ranks.
Designed to operate from 9V to 24V, the monolithic device includes control, drive, protection and diagnostics for stop, tail and turn indicator lights, and provides up to 8A of current-limited output from its 180kHz SMPS.
Positioned between the dipped and full beam headlights, they are activated by a variety of factors such as speed, steering angle and which turn indicator is activated.
This styling is further enhanced by the integration of a linear turn indicator, the largest on the market with best-in-class homogeneity.
The extra lighting tubes are positioned between the dipped and full beam headlights and either the left or right unit is activated by the central control unit depending on a variety of factors such as road speed, the steering angle and which turn indicator is operated.
With a simple flick of the switch - either up or down, depending on which lane the driver is moving into - the turn indicator will blink three times and automatically shut off.