Federal Aviation Administration, DOT

Section 91.180

for navigation, this applies only when
the aircraft is within 22 nautical miles
of that VOR (based on the reasonable
estimate by the pilot operating the aircraft of that distance); or
(2) If no applicable minimum altitude
is prescribed in parts 95 and 97 of this
chapter, then - 
(i) In the case of operations over an
area designated as a mountainous area
in part 95 of this chapter, an altitude of
2,000 feet above the highest obstacle
within a horizontal distance of 4 nautical miles from the course to be flown;
or
(ii) In any other case, an altitude of
1,000 feet above the highest obstacle
within a horizontal distance of 4 nautical miles from the course to be flown.
(b) Climb. Climb to a higher minimum
IFR altitude shall begin immediately
after passing the point beyond which
that minimum altitude applies, except
that when ground obstructions intervene, the point beyond which that
higher minimum altitude applies shall
be crossed at or above the applicable
MCA.
[Doc. No. 18334, 54 FR 34294, Aug. 18, 1989, as
amended by Amdt. 91-296, 72 FR 31678, June
7, 2007; Amdt. 91-315, 75 FR 30690, June 2, 2010]

kpayne on VMOFRWIN702 with $$_JOB

Section 91.179 IFR cruising altitude or flight
level.
Unless otherwise authorized by ATC,
the following rules apply - 
(a) In controlled airspace. Each person
operating an aircraft under IFR in
level cruising flight in controlled airspace shall maintain the altitude or
flight level assigned that aircraft by
ATC. However, if the ATC clearance assigns  - VFR conditions on-top, -  that
person shall maintain an altitude or
flight level as prescribed by Section 91.159.
(b) In uncontrolled airspace. Except
while in a holding pattern of 2 minutes
or less or while turning, each person
operating an aircraft under IFR in
level cruising flight in uncontrolled
airspace shall maintain an appropriate
altitude as follows:
(1) When operating below 18,000 feet
MSL and - 
(i) On a magnetic course of zero degrees 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 degrees 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 degrees through 179 degrees, any odd
flight level (such as 190, 210, or 230); or
(ii) On a magnetic course of 180 degrees 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 degrees 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 degrees 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 Reduced Vertical Separation Minimum
(RVSM) airspace and - 
(i) On a magnetic course of zero degrees through 179 degrees, any odd
flight level, at 2,000-foot intervals beginning 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 degrees through 359 degrees, any even
flight level, at 2000-foot intervals beginning 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]

Section 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 operate a civil aircraft in airspace designated as Reduced Vertical Separation Minimum (RVSM) airspace unless:
(1) The operator and the operator-s
aircraft comply with the minimum
standards of appendix G of this part;
and

741

VerDate Sep<11>2014

16:30 Jun 25, 2019

Jkt 247047

PO 00000

Frm 00751

Fmt 8010

Sfmt 8010

Q:\14\14V2.TXT

PC31