Editing Instrument flight rules (section)

===Aircraft===
The aircraft must be equipped and type-certified for instrument flight, and the related navigational equipment must have been inspected or tested within a specific period of time prior to the instrument flight.

In the United States, instruments required for IFR flight in addition to those that are required for VFR flight are: [[heading indicator]], [[altimeter|sensitive altimeter]] adjustable for [[atmospheric pressure|barometric pressure]], [[clock]] with a sweep-second pointer or digital equivalent, [[attitude indicator]], [[airband|radios]] and suitable [[avionics]] for the route to be flown, [[alternator]] or [[electrical generator|generator]], [[gyroscope|gyroscopic]] rate-of-turn indicator that is either a [[turn coordinator]] or the [[turn and bank indicator]].<ref>{{cite web|url=http://www.gpo.gov/fdsys/pkg/CFR-2009-title14-vol2/pdf/CFR-2009-title14-vol2-sec91-205.pdf|title=14 CFR 91.205|website=gpo.gov|access-date=31 March 2018}}</ref> From 1999 single-engine helicopters could not be FAA-certified for IFR.<ref name=vert2015-04>{{cite news |first=Mike |last=Hirschberg |url=http://www.verticalmag.com/digital_issue/2015/v14i2/files/12.html |title=Resurrecting single-engine helicopter IFR |work=Vertical Magazine |date=April–May 2015 |access-date=11 April 2015 |archive-url=https://web.archive.org/web/20150419022931/http://www.verticalmag.com/digital_issue/2015/v14i2/files/12.html |archive-date=2015-04-19 |url-status=dead }}</ref> Recently, however, Bell and Leonardo have certified the single engine helicopters for instrument flight rules.{{citation needed|date=December 2019}}