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715 

Federal Aviation Administration, DOT 

§ 91.183 

(1) When operating below 18,000 feet 

MSL and— 

(i) On a magnetic course of zero de-

grees through 179 degrees, any odd 
thousand foot MSL altitude (such as 
3,000, 5,000, or 7,000); or 

(ii) On a magnetic course of 180 de-

grees through 359 degrees, any even 
thousand foot MSL altitude (such as 
2,000, 4,000, or 6,000). 

(2) When operating at or above 18,000 

feet MSL but below flight level 290, 
and— 

(i) On a magnetic course of zero de-

grees through 179 degrees, any odd 
flight level (such as 190, 210, or 230); or 

(ii) On a magnetic course of 180 de-

grees through 359 degrees, any even 
flight level (such as 180, 200, or 220). 

(3) When operating at flight level 290 

and above in non-RVSM airspace, and— 

(i) On a magnetic course of zero de-

grees through 179 degrees, any flight 
level, at 4,000-foot intervals, beginning 
at and including flight level 290 (such 
as flight level 290, 330, or 370); or 

(ii) On a magnetic course of 180 de-

grees through 359 degrees, any flight 
level, at 4,000-foot intervals, beginning 
at and including flight level 310 (such 
as flight level 310, 350, or 390). 

(4) When operating at flight level 290 

and above in airspace designated as Re-
duced Vertical Separation Minimum 
(RVSM) airspace and— 

(i) On a magnetic course of zero de-

grees through 179 degrees, any odd 
flight level, at 2,000-foot intervals be-
ginning at and including flight level 290 
(such as flight level 290, 310, 330, 350, 
370, 390, 410); or 

(ii) On a magnetic course of 180 de-

grees through 359 degrees, any even 
flight level, at 2000-foot intervals be-
ginning at and including flight level 300 
(such as 300, 320, 340, 360, 380, 400). 

[Doc. No. 18334, 54 FR 34294, Aug. 18, 1989, as 
amended by Amdt. 91–276, 68 FR 61321, Oct. 
27, 2003; 68 FR 70133, Dec. 17, 2003; Amdt. 91– 
296, 72 FR 31679, June 7, 2007] 

§ 91.180

Operations within airspace 

designated as Reduced Vertical 
Separation Minimum airspace. 

(a) Except as provided in paragraph 

(b) of this section, no person may oper-
ate a civil aircraft in airspace des-
ignated as Reduced Vertical Separa-
tion Minimum (RVSM) airspace unless: 

(1) The operator and the operator’s 

aircraft comply with the minimum 
standards of appendix G of this part; 
and 

(2) The operator is authorized by the 

Administrator or the country of reg-
istry to conduct such operations. 

(b) The Administrator may authorize 

a deviation from the requirements of 
this section. 

[Amdt. 91–276, 68 FR 70133, Dec. 17, 2003] 

§ 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 cen-

terline of that airway. 

(b) On any other route, along the di-

rect course between the navigational 
aids or fixes defining that route. How-
ever, this section does not prohibit ma-
neuvering the aircraft to pass well 
clear of other air traffic or the maneu-
vering of the aircraft in VFR condi-
tions to clear the intended flight path 
both before and during climb or de-
scent. 

[Doc. No. 18334, 54 FR 34294, Aug. 18, 1989, as 
amended by Amdt. 91–296, 72 FR 31679, June 
7, 2007] 

§ 91.183

IFR communications. 

Unless otherwise authorized by ATC, 

the pilot in command of each aircraft 
operated under IFR in controlled air-
space must ensure that a continuous 
watch is maintained on the appropriate 
frequency and must report the fol-
lowing as soon as possible— 

(a) The time and altitude of passing 

each designated reporting point, or the 
reporting points specified by ATC, ex-
cept that while the aircraft is under 
radar control, only the passing of those 
reporting points specifically requested 
by ATC need be reported; 

(b) Any unforecast weather condi-

tions encountered; and 

(c) Any other information relating to 

the safety of flight. 

[Doc. No. 18334, 54 FR 34294, Aug. 18, 1989, as 
amended by Amdt. 91–296, 72 FR 31679, June 
7, 2007] 

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