Editing Flight instruments (section)

==Gyroscopic systems==
===Attitude Indicator <!-- This is ATTITUDE, not Altitude. Do not change it. -->===
{{main|Attitude indicator}}
;[[Image:Attitude indicator level flight.svg|left|100px]]
The attitude indicator (also known as an ''artificial horizon'') shows the aircraft's relation to the horizon. From this the pilot can tell whether the wings are level ([[Flight dynamics|roll]]) and if the aircraft nose is pointing above or below the horizon ([[Flight dynamics|pitch]]).<ref name=faa/>{{rp|3-18 to 3-19}} Attitude is always presented to users in the unit [[Degree (angle)|degrees]] (°).{{citation needed|date=October 2019}} The attitude indicator is a primary instrument for instrument flight and is also useful in conditions of poor visibility. Pilots are trained to use other instruments in combination should this instrument or its power fail.

[[Image:Glider Instrument Panel.png|right|thumb|250px|[[Schempp-Hirth Janus]]-C [[Glider (sailplane)|glider]] Instrument panel equipped for "cloud flying". The [[turn and bank indicator]] is top centre. The [[heading indicator]] is replaced by a [[GPS]]-driven computer with wind and glide data, driving two electronic variometer displays to the right.]]

===Heading indicator===
{{main|Heading indicator}}
;[[Image:Heading indicator.svg|left|100px]]
The heading indicator (also known as the directional gyro, or DG) displays the aircraft's heading  in [[Points of the compass|compass points]], and with respect to magnetic north when set with a compass. Bearing friction causes drift errors from [[precession]], which must be periodically corrected by calibrating the instrument to the magnetic compass.<ref name=faa/>{{rp|3-19 to 3-20}} In many advanced aircraft (including almost all jet aircraft), the heading indicator is replaced by a [[horizontal situation indicator]] (HSI) which provides the same heading information, but also assists with navigation.

===Turn indicator===
{{main|Turn and slip indicator}}
;[[Image:Turn coordinator - coordinated.svg|left|100px]]
These include the Turn-and-Slip Indicator and the Turn Coordinator, which indicate rotation about the [[Aircraft principal axes|longitudinal axis]].  They include an [[inclinometer]] to indicate if the aircraft is in [[Coordinated flight]], or in a [[Slip (aerodynamics)|Slip]] or [[Skid (aerodynamics)|Skid]].  Additional marks indicate a [[Standard rate turn]].<ref name=faa/>{{rp|3-20 to 3-22}} The turn rate is most commonly expressed in either [[Degree (angle)|degrees]] per [[second]] (deg/s) or [[minute]]s per [[Turn (angle)|turn]] (min/tr).{{citation needed|date=October 2019}}