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14 CFR Ch. I (1–1–14 Edition)

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14 CFR Ch. I (1–1–14 Edition) § 91.179 14 CFR Ch. I (1–1–14 Edition) be crossed at or above the applicable duced Vertical Separation Minimum MCA. (RVSM) airspace and— [Doc. No. 18334, 54 FR 34294, Aug. 18, 1989, as (i) On a magnetic course of zero de- amended by Amdt. 91–296, 72 FR 31678, June grees through 179 degrees, any odd 7, 2007; Amdt. 91–315, 75 FR 30690, June 2, 2010] flight level, at 2,000-foot intervals be- ginning at and including flight level 290 § 91.179 IFR cruising altitude or flight (such as flight level 290, 310, 330, 350, level. 370, 390, 410); or Unless otherwise authorized by ATC, (ii) On a magnetic course of 180 de- the following rules apply— grees through 359 degrees, any even (a) In controlled airspace. Each person flight level, at 2000-foot intervals be- operating an aircraft under IFR in ginning at and including flight level 300 level cruising flight in controlled air- (such as 300, 320, 340, 360, 380, 400). space shall maintain the altitude or [Doc. No. 18334, 54 FR 34294, Aug. 18, 1989, as flight level assigned that aircraft by amended by Amdt. 91–276, 68 FR 61321, Oct. ATC. However, if the ATC clearance as- 27, 2003; 68 FR 70133, Dec. 17, 2003; Amdt. 91– signs ‘‘VFR conditions on-top,’’ that 296, 72 FR 31679, June 7, 2007] person shall maintain an altitude or flight level as prescribed by § 91.159. § 91.180 Operations within airspace (b) In uncontrolled airspace. Except designated as Reduced Vertical while in a holding pattern of 2 minutes Separation Minimum airspace. or less or while turning, each person (a) Except as provided in paragraph operating an aircraft under IFR in (b) of this section, no person may oper- level cruising flight in uncontrolled ate a civil aircraft in airspace des- airspace shall maintain an appropriate ignated as Reduced Vertical Separa- altitude as follows: tion Minimum (RVSM) airspace unless: (1) When operating below 18,000 feet (1) The operator and the operator’s MSL and— aircraft comply with the minimum (i) On a magnetic course of zero de- standards of appendix G of this part; grees through 179 degrees, any odd and thousand foot MSL altitude (such as (2) The operator is authorized by the 3,000, 5,000, or 7,000); or Administrator or the country of reg- (ii) On a magnetic course of 180 de- istry to conduct such operations. grees through 359 degrees, any even (b) The Administrator may authorize thousand foot MSL altitude (such as a deviation from the requirements of 2,000, 4,000, or 6,000). this section. (2) When operating at or above 18,000 feet MSL but below flight level 290, [Amdt. 91–276, 68 FR 70133, Dec. 17, 2003] and— § 91.181 Course to be flown. (i) On a magnetic course of zero de- grees through 179 degrees, any odd Unless otherwise authorized by ATC, flight level (such as 190, 210, or 230); or no person may operate an aircraft (ii) On a magnetic course of 180 de- within controlled airspace under IFR grees through 359 degrees, any even except as follows: flight level (such as 180, 200, or 220). (a) On an ATS route, along the cen- (3) When operating at flight level 290 terline of that airway. and above in non-RVSM airspace, and— (b) On any other route, along the di- (i) On a magnetic course of zero de- rect course between the navigational grees through 179 degrees, any flight aids or fixes defining that route. How- level, at 4,000-foot intervals, beginning ever, this section does not prohibit ma- at and including flight level 290 (such neuvering the aircraft to pass well as flight level 290, 330, or 370); or clear of other air traffic or the maneu- (ii) On a magnetic course of 180 de- vering of the aircraft in VFR condi- grees through 359 degrees, any flight tions to clear the intended flight path level, at 4,000-foot intervals, beginning both before and during climb or de- at and including flight level 310 (such scent. as flight level 310, 350, or 390). [Doc. No. 18334, 54 FR 34294, Aug. 18, 1989, as (4) When operating at flight level 290 amended by Amdt. 91–296, 72 FR 31679, June and above in airspace designated as Re- 7, 2007] 728 VerDate Mar<15>2010 20:48 Jan 30, 2014 Jkt 232047 PO 00000 Frm 00738 Fmt 8010 Sfmt 8010 Q:\14\14V2.TXT ofr150 PsN: PC150.
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