IFR Cruising Altitude Or Flight Level
Federal Aviation Administration, DOT § 91.179 approaches without vertical guidance; that when ground obstructions inter- and vene, the point beyond which that (iii) The displayed imagery and air- higher minimum altitude applies shall craft flight symbology do not adversely be crossed at or above the applicable obscure the pilot’s outside view or field MCA. of view through the cockpit window; [Doc. No. 18334, 54 FR 34294, Aug. 18, 1989, as (3) The EFVS includes the display amended by Amdt. 91–296, 72 FR 31678, June element, sensors, computers and power 7, 2007] supplies, indications, and controls. It may receive inputs from an airborne § 91.179 IFR cruising altitude or flight navigation system or flight guidance level. system; and Unless otherwise authorized by ATC, (4) The display characteristics and the following rules apply— dynamics are suitable for manual con- (a) In controlled airspace. Each person trol of the aircraft. operating an aircraft under IFR in [Doc. No. 18334, 54 FR 34294, Aug. 18, 1989, as level cruising flight in controlled air- amended by Amdt. 91–267, 66 FR 21066, Apr. space shall maintain the altitude or 27, 2001; Amdt. 91–281, 69 FR 1640, Jan. 9, 2004; flight level assigned that aircraft by Amdt. 91–296, 72 FR 31678, June 7, 2007; Amdt. ATC. However, if the ATC clearance as- 91–306, 74 FR 20205, May 1, 2009] signs ‘‘VFR conditions on-top,’’ that § 91.177 Minimum altitudes for IFR op- person shall maintain an altitude or erations. flight level as prescribed by § 91.159. (b) In uncontrolled airspace. Except (a) Operation of aircraft at minimum al- while in a holding pattern of 2 minutes titudes.
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