What course must be flown while operating in controlled airspace under IFR on an airway?
Answer
Along the centerline of the airway (ATS route). On any other route, along the direct course between navigational aids or fixes defining that route.
14 CFR § 91.181
Read the full regulation — 14 CFR § 91.181
Part 91 Section 91.181 § 91.181 Course to be flown. Unless otherwise authorized by ATC, no person may operate an aircraft within controlled airspace under IFR except as follows: (a) On an ATS route, along the centerline of that airway. (b) On any other route, along the direct course between the navigational aids or fixes defining that route. However, this section does not prohibit maneuvering the aircraft to pass well clear of other air traffic or the maneuvering of the aircraft in VFR conditions to clear the intended flight path both before and during climb or descent.
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