§91.177

From AeroManual
Jump to: navigation, search

§ 91.177 Minimum altitudes for IFR operations.

(a) Operation of aircraft at minimum altitudes. Except when necessary for takeoff or landing, or unless otherwise authorized by the FAA, no person may operate an aircraft under IFR below—

(1) The applicable minimum altitudes prescribed in parts 95 and 97 of this chapter. However, if both a MEA and a MOCA are prescribed for a particular route or route segment, a person may operate an aircraft below the MEA down to, but not below, the MOCA, provided the applicable navigation signals are available. For aircraft using VOR 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.

Part §91 Subpart B — Flight Rules
§91.101 Applicability • §91.103 Preflight • §91.105 Crewmembers at stations • §91.107 Seatbelts • §91.109 Flight instruction • §91.111 Near other aircraft
§91.113 Right-of-way • §91.115 Right-of-way on water • §91.117 Speed Limits • §91.119 Minimum altitudes • §91.121 Altimeter • §91.123 ATC instructions • §91.125 Light signals
§91.126 Class G • §91.127 Class E • §91.129 Class D • §91.130 Class C • §91.131 Class B • §91.133 Restricted areas • §91.135 Class A
§91.137 TFRs • §91.138 Hawaiian TFRs • §91.139 Emergency traffic • §91.141 Presidential TFRs • §91.143 Space ops • §91.144 High barometric pressure
§91.145 Air shows & and sporting events • §91.146 Charity flights • §91.147 Paying-passenger flights
§91.151 VFR Fuel reserves • §91.153 VFR flight plans • §91.155 VFR weather minimums • §91.157 Special VFR • §91.159 VFR cruising altitude • §91.161 DC ADIZ
§91.167 IFR Fuel reserves • §91.169 IFR flight plans • §91.171 VOR test • §91.173 ATC clearances • §91.175 IFR Takeoffs and landing
§91.177 IFR Minimum altitudes • §91.179 IFR cruising altitudes • §91.180 RVSM • §91.181 Course flown • §91.183 IFR comm. • §91.185 IFR radio failure
§91.187 Malfunctions in IFR • §91.189 Cat II & III ops. • §91.191 Cat II & III manual • §91.193 Certain Cat II ops.