Editing Attitude indicator (section)

==Flight Director Attitude Indicator==
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Attitude indicators are also used on crewed spacecraft and are called '''Flight Director Attitude Indicators''' (FDAI), where they indicate the craft's yaw angle (nose left or right), pitch (nose up or down), roll, and orbit relative to a fixed-space [[inertial reference frame]] from an Inertial Measurement Unit (IMU).<ref name=":0">{{Cite web|url=https://www.hq.nasa.gov/alsj/alsj-FDAI.html|title=Flight-Director/{{sic|Ati|tude|nolink=y}} Indicator|website=www.hq.nasa.gov|access-date=2016-12-01}}</ref> The FDAI can be configured to use known positions relative to Earth or the stars, so that the engineers, scientists and astronauts can communicate the relative position, attitude, and orbit of the craft.<ref name=":1">{{Cite web|url=https://history.nasa.gov/afj/aohindex.htm|title=Apollo Flight Journal - Apollo Operations Handbook. Volume 1.|website=history.nasa.gov|access-date=2016-12-01|archive-url=https://web.archive.org/web/20151224133217/http://history.nasa.gov/afj/aohindex.htm|archive-date=2015-12-24|url-status=dead}}</ref><ref>{{cite journal |title=Apollo Guidance, Navigation, and Control (GNC) Hardware Overview |url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090016290.pdf |website=NASA Technical Reports Server |date=January 2009 |publisher=NASA |access-date=12 October 2018|last1=Interbartolo |first1=Michael }}</ref>