Editing Attitude indicator (section)

==Attitude and Heading Reference Systems==
[[AHRS|Attitude and Heading Reference Systems (AHRS)]] are able to provide three-axis information based on [[ring laser gyroscope]]s, that can be shared with multiple devices in the aircraft, such as "[[glass cockpit]]" primary flight displays ([[Primary flight display|PFD]]s). Rather than using a spinning gyroscope, modern AHRS use [[solid-state electronics]], low-cost [[inertial sensor]]s, [[rate gyro]]s, and [[magnetometer]]s.<ref name=FAA1/>{{rp|8–20}}<ref name=FAA2/>{{rp|5–22}}

With most AHRS systems, if an aircraft's AIs have failed there will be a standby AI located in the center of the instrument panel, where other standby basic instruments such as the airspeed indicator and altimeter are also available. These mostly mechanical standby instruments may remain available even if the electronic flight instruments fail, although the standby attitude indicator may be electrically driven and will, after a short time, fail if its electrical power fails.<ref>{{Cite web |title=NTSB Safety Recommendation |url=https://www.ntsb.gov/publications/_layouts/ntsb.recsearch/Recommendation.aspx?Rec=A-08-054|date=2010-11-08}}</ref>