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Turn & Slip Indicator and Turn Coordinator
Turn & Slip Indicator and Turn Coordinator
Published: 2016/04/08
Channel: Pilot Effect
How Gyroscopic Turn & Slip Indicator Works
How Gyroscopic Turn & Slip Indicator Works
Published: 2012/02/23
Channel: Kostas Makris
Turn Co ordinator and Turn and Slip Indicator aviation english
Turn Co ordinator and Turn and Slip Indicator aviation english
Published: 2016/12/06
Channel: Aeronautical Science
Turn Coordinator
Turn Coordinator
Published: 2015/09/07
Channel: Mathieu Grassi
Turn Co ordinator and Turn and Slip Indicator (aviation english)
Turn Co ordinator and Turn and Slip Indicator (aviation english)
Published: 2016/04/02
Channel: Aviation English.club
Turn and slip indicator
Turn and slip indicator
Published: 2016/01/04
Channel: Audiopedia
[Fly Garfield]Turn and Slip indicator introduction(English)
[Fly Garfield]Turn and Slip indicator introduction(English)
Published: 2016/09/02
Channel: Chang Serchen
Turn and Bank Indicator
Turn and Bank Indicator
Published: 2014/08/14
Channel: RP FYP
ATPL Training / Flight Instruments #30 Turn Co-ordinator and Turn and Slip Indicator
ATPL Training / Flight Instruments #30 Turn Co-ordinator and Turn and Slip Indicator
Published: 2017/06/15
Channel: Aviation Training Network
Turn and slip indicator
Turn and slip indicator
Published: 2015/05/03
Channel: Luiz Paulo Giampaoli
Turn Coordinator
Turn Coordinator
Published: 2015/09/07
Channel: Mathieu Grassi
Aviation Safety
Aviation Safety's Slip/Skid Lesson
Published: 2010/03/09
Channel: AVweb
VDC/Slip/ABS lights are on.
VDC/Slip/ABS lights are on.
Published: 2017/01/07
Channel: Richard Yang
Ground School: How a Turn Coordinator Works | Inner Workings
Ground School: How a Turn Coordinator Works | Inner Workings
Published: 2016/10/13
Channel: FLY8MA.com Flight Training
Turn Coordinator Animation
Turn Coordinator Animation
Published: 2014/10/21
Channel: Dynactive Designs
Gyroscopic Turn & Slip Indicator
Gyroscopic Turn & Slip Indicator
Published: 2011/12/25
Channel: Kostas Makris
Turn-and-Slip Indicator
Turn-and-Slip Indicator
Published: 2009/03/31
Channel: James Sullivan
Mindstar Aviation G1000 - Video 3: The PFD (Part B)
Mindstar Aviation G1000 - Video 3: The PFD (Part B)
Published: 2009/08/20
Channel: MindstarAviation
Indicator, Turn & Slip, 4 Minute Turn, Aircraft one each
Indicator, Turn & Slip, 4 Minute Turn, Aircraft one each
Published: 2011/03/25
Channel: AllAmericanFiveRadio
Turn Coordinator / Skid Slip Indicator / 2 Minute Turn
Turn Coordinator / Skid Slip Indicator / 2 Minute Turn
Published: 2007/09/09
Channel: 88TransAmPilot
Simple Turn & bank indicator
Simple Turn & bank indicator
Published: 2014/07/03
Channel: RP FYP
2005 Toyota Sienna XLE Limited.  Slip indicator sensor false positive
2005 Toyota Sienna XLE Limited. Slip indicator sensor false positive
Published: 2015/06/06
Channel: gunther9123
slipping turns
slipping turns
Published: 2016/12/28
Channel: Larry Mednick
Death of a Turn Coordinator
Death of a Turn Coordinator
Published: 2012/10/31
Channel: Private
[貓大學飛講堂]Turn and Slip indicator 的中文介紹
[貓大學飛講堂]Turn and Slip indicator 的中文介紹
Published: 2016/09/02
Channel: Chang Serchen
Flight Simulator 98 Turn Coordinator tutorial
Flight Simulator 98 Turn Coordinator tutorial
Published: 2012/04/16
Channel: Arash Ahmadi
Huey Slip Indicator
Huey Slip Indicator
Published: 2017/01/11
Channel: DarkCrow 83
Turn indicator update
Turn indicator update
Published: 2017/03/20
Channel: Block Incorporated BTJ
T&B 001
T&B 001
Published: 2016/02/29
Channel: Kerry Gietzel
Stall and Incipient Spin from a Slipping Turn
Stall and Incipient Spin from a Slipping Turn
Published: 2016/08/27
Channel: BruceAirFlying
Turn Indicator Lights
Turn Indicator Lights
Published: 2014/07/19
Channel: scott phelps
Turn and bank indicator Meaning
Turn and bank indicator Meaning
Published: 2015/04/28
Channel: ADictionary
Gyroscopes in the Cockpit
Gyroscopes in the Cockpit
Published: 2010/11/17
Channel: SkyClear
Turn and Bank Indicator - Copy - by Wideo.co
Turn and Bank Indicator - Copy - by Wideo.co
Published: 2014/07/03
Channel: RP FYP
Turn and Bank Indicator
Turn and Bank Indicator
Published: 2013/02/12
Channel: petrlicht
Right hand slipping base turn You Tube
Right hand slipping base turn You Tube
Published: 2016/07/17
Channel: Mike Vaccaro
Turn & Slip
Turn & Slip
Published: 2016/01/31
Channel: East Midlands Flight Simulators
2012 | Toyota | Camry | VSC And Traction Control Shutoff | How To by Toyota City Minneapolis MN
2012 | Toyota | Camry | VSC And Traction Control Shutoff | How To by Toyota City Minneapolis MN
Published: 2011/10/15
Channel: Luther Brookdale Toyota
Cessna Turn Coordinator
Cessna Turn Coordinator
Published: 2015/02/23
Channel: AD7ZJ
ATC-810 instrument test
ATC-810 instrument test
Published: 2015/04/10
Channel: SabrelinerSim
Link aviation Bank and Turn indicator teardown
Link aviation Bank and Turn indicator teardown
Published: 2016/10/14
Channel: msylvain59
IFR Written Test Prep: What is the primary bank instrument once a standard-rate turn is established?
IFR Written Test Prep: What is the primary bank instrument once a standard-rate turn is established?
Published: 2015/12/14
Channel: Valerie Ashton {socalvalerie}
Turn coordinator
Turn coordinator
Published: 2015/10/03
Channel: Bertil Frodin
Radiant Turn Coordinator Demo
Radiant Turn Coordinator Demo
Published: 2016/09/14
Channel: BeliteAircraft
CD V-700 With Turn And Bank Indicator
CD V-700 With Turn And Bank Indicator
Published: 2008/09/14
Channel: vanamonde2
IFR Written Test Prep: What indication is presented by the miniature aircraft of the turn...
IFR Written Test Prep: What indication is presented by the miniature aircraft of the turn...
Published: 2015/12/13
Channel: Valerie Ashton {socalvalerie}
Turn and Bank Indicator  - Copy - by Wideo.co
Turn and Bank Indicator - Copy - by Wideo.co
Published: 2014/08/06
Channel: RP FYP
How to Pronounce Turn And Slip Indicator
How to Pronounce Turn And Slip Indicator
Published: 2017/01/07
Channel: Dictionary Voice
"Turn indicator & drips"
"Turn indicator & drips"
Published: 2012/07/07
Channel: jcfl52345
Gyroscopic Instruments - U.S. Navy Aviation Training Film (1960)
Gyroscopic Instruments - U.S. Navy Aviation Training Film (1960)
Published: 2012/11/29
Channel: 2degreewca
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Illustration of the face of a turn-and-slip indicator

In aviation, the turn and slip indicator (T/S, a.k.a. turn and bank indicator) and the turn coordinator (TC) variant are essentially two aircraft flight instruments in one device. One indicates the rate of turn, or the rate of change in the aircraft's heading, the other part indicates whether the aircraft is in coordinated flight, showing the slip or skid of the turn. The slip indicator is actually an inclinometer that at rest displays the angle of the aircraft's lateral axis with respect to horizontal, and in motion displays this angle as modified by the acceleration of the aircraft.[1]

Name[edit]

The turn and slip indicator can be referred to as the turn and bank indicator, although the instrument does not respond directly to bank angle. Neither does the turn coordinator, but it does respond to roll rate, which enables it to respond more quickly to the start of a turn.[2]

Operation[edit]

Graphic of a turn and slip indicator and a turn coordinator

Turn indicator[edit]

The turn indicator is a gyroscopic instrument that works on the principle of precession. The gyro is mounted in a gimbal. The gyro's rotational axis is in-line with the lateral (pitch) axis of the aircraft, while the gimbal has limited freedom around the longitudinal (roll) axis of the aircraft.

As the aircraft yaws, a torque force is applied to the gyro around the vertical axis, due to aircraft yaw, which causes gyro precession around the roll axis. The gyro spins on an axis that is 90 degrees relative to the direction of the applied yaw torque force. The gyro and gimbal rotate (around the roll axis) with limited freedom against a calibrated spring.

The torque force against the spring reaches an equilibrium and the angle that the gimbal and gyro become positioned is directly connected to the display needle, thereby indicating the rate of turn.[3] In the turn coordinator, the gyro is canted 30 degrees from the horizontal so it responds to roll as well as yaw.

The display contains hash marks for the pilot's reference during a turn. When the needle is lined up with a hash mark, the aircraft is performing a "standard rate turn" which is defined as three degrees per second, known in some countries as "rate one". This translates to two minutes per 360 degrees of turn (a complete circle). Indicators are marked as to their sensitivity,[4] with "2 min turn" for those whose hash marks correspond to a standard rate or two-minute turn, and "4 min turn" for those, used in faster aircraft, that show a half standard rate or four-minute turn. The supersonic Concorde jet aircraft and many military jets are examples of aircraft that use 4 min. turn indicators. The hash marks are sometimes called "dog houses", because of their distinct shape on various makes of turn indicators. Under instrument flight rules, using these figures allows a pilot to perform timed turns in order to conform with the required air traffic patterns. For a change of heading of 90 degrees, a turn lasting 30 seconds would be required to perform a standard rate or "rate one" turn.

Inclinometer[edit]

Coordinated flight indication is obtained by using an inclinometer, which is recognized as the "ball in a tube". An inclinometer contains a ball sealed inside a curved glass tube, which also contains a liquid to act as a damping medium. The original form of the indicator is in effect a spirit level with the tube curved in the opposite direction and a bubble replacing the ball.[5] In some early aircraft the indicator was merely a pendulum with a dashpot for damping. The ball gives an indication of whether the aircraft is slipping, skidding or in coordinated flight. The ball's movement is caused by the force of gravity and the aircraft's centripetal acceleration. When the ball is centered in the middle of the tube, the aircraft is said to be in coordinated flight. If the ball is on the inside (wing down side) of a turn, the aircraft is slipping. And finally, when the ball is on the outside (wing up side) of the turn, the aircraft is skidding.

A simple alternative to the balance indicator is a yaw string, which allows the pilot to simply view the string's movements as rudimentary indication of aircraft balance.

Turn coordinator[edit]

Image showing the face of a turn coordinator during a standard rate coordinated right turn.

The turn coordinator (TC) is a further development of the turn and slip indicator (T/S) with the major difference being the display and the axis upon which the gimbal is mounted. The display is that of a miniature airplane as seen from behind. This looks similar to that of an attitude indicator. "NO PITCH INFORMATION" is usually written on the instrument to avoid confusion regarding the aircraft's pitch, which can be obtained from the artificial horizon instrument.

In contrast to the T/S, the TC's gimbal is pitched up 30 degrees from the lateral axis. This causes the instrument to respond to roll as well as yaw. This allows the instrument to display a change more quickly as it will react to the change in roll before the aircraft has even begun to yaw. Although this instrument reacts to changes in the aircraft's roll, it does not display the roll attitude.

The turn coordinator may be used as a performance instrument when the attitude indicator has failed. This is called "partial panel" operations. It can be unnecessarily difficult or even impossible if the pilot does not understand that the instrument is showing roll rates as well as turn rates. The usefulness is also impaired if the internal dashpot is worn out. In the latter case, the instrument is underdamped and in turbulence will indicate large full-scale deflections to the left and right, all of which are actually roll rate responses. In this condition it may not be possible for the pilot to maintain control of the aircraft in partial-panel operations in instrument meteorological conditions. For this and other reasons, many highly experienced pilots prefer the "older" turn and bank indicator design.[citation needed]

Practical implications[edit]

Skidding. The corrective action is to press the "left" pedal adequately.

Slipping and skidding within a turn is sometimes referred to as a sloppy turn, due to the perceptive discomfort it can cause to the pilot and passengers. When the aircraft is in a balanced turn (ball is centered), passengers experience gravity directly in line with their seat (force perpendicular to seat). With a well balanced turn, passengers may not even realize the aircraft is turning unless they are viewing objects outside the aircraft.

While aircraft slipping and skidding are often undesired in a usual turn that maintains altitude, slipping of the aircraft can be used for practical purposes. Intentionally putting an aircraft into a slip is used as a forward slip and a sideslip. These slips are performed by applying opposite inputs of the aileron and rudder controls. A forward slip allows a pilot to quickly drop altitude without gaining unnecessary speed, while a sideslip is one method utilized to perform a crosswind landing.

See also[edit]

References[edit]

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