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FAR 61.57 INSTRUMENT EXPERIENCE FAR 91.3 PIC RESPONSIBILITY FAR 91.103 PREFLIGHT ACTION FAR 91.123 COMPLIANCE WITH ATC FAR 91.125 ATC LIGHT SIGNALS FAR 91.153 VFR FLIGHT PLAN INFO FAR 91.155 BASIC VFR WX MINIMUMS FAR 91.157 SPECIAL VFR FAR 91.167 IFR FUEL REQUIREMENTS FAR 91.169 IFR FLIGHT PLAN FAR 91.171 VOR CHECK FOR IFR FAR 91.173 ATC CLEARANCE AND FLIGHT PLAN FAR 91.175 T/O AND LANDING UNDER IFR FAR 91.177 MINIMUM IFR ALTITUDE FAR 91.179 IFR CRUISING ALTITUDES FAR 91.181 COURSE TO BE FLOWN FAR 91.183 IFR RADIO COMMUNICATIONS FAR 91.185 IFR COMM FAILURE FAR 91.187 IFR MALFUNCTION REPORTS FAR 91.205 EQUIPMENT REQ. FAR 91.211 SUPPLEMENTAL OXYGEN FAR 91.215 ATC TRANSPONDER AND ALTITUDE REPORTING EQUIPMENT |
FAR 91.179 IFR CRUISING ALTITUDE
(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 Sec. 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, 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).
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