Ch 6 Flashcards
Minimum Aircraft Altitude VFR
fly appropriate VFR hemispheric altitudes when higher than 3,000
ft. above ground level (AGL)
Minimum Aircraft Altitude IFR (no lower than)
On Airways, no lower than any published minimum for the airway
Off Airways
The Off Route Obstacle Clearance Altitude (OROCA)
The Off Route Terrain Clearance Altitude (ORTCA)
An altitude that provides at least 1,000 ft. of clearance above all obstacles
within 4 NMs of the course to be flown in non-mountainous terrain, or 2,000 ft. in
mountainous terrain
Non-congested Areas
Operate over non-congested areas at an altitude at or
above 500 ft. AGL except over open water, in special use airspace or 500’ to any person, vessel/vehicle or structure
Congested Areas
at least 1,000 ft. above the
highest obstacle within a 2,000-ft. radius
Flight over National Recreation Areas and Wildlife Refuges
Operate no less
than 2,000 ft. AGL
Supersonic Flight.
Do not operate aircraft at or above Mach l except as specified in
AFI 13-201
In the NAS Airspeed
Do not exceed 200 knots indicated airspeed (KIAS) at or below 2,500 ft. AGL
within 4 NM of the primary airport in Class C or Class D airspace
Class B Airspace airspeed
Do not exceed 200 KIAS in the airspace underlying Class B airspace or in a
VFR corridor designated through Class B airspace unless required to maintain the
minimum operating airspeed specified in the aircraft
Airspeed below 10,000’
Do not exceed 250 KIAS below 10,000 ft. MSL (T-0). MAJCOMs may approve
operations exceeding 250 KIAS below 10,000 ft. MSL
Volcanic Activity
Unless conducting rescue operations, do not operate within 50
NM of known or reported hazardous volcanic ash
Bird Watch Condition (BWC)
BWC MODERATE. Operational commanders will consider restricting
formation departures, approaches, and pattern work.
BWC SEVERE. Do not conduct flight operations except in an emergency (T-3).
Arriving aircraft will either hold awaiting a lower BWC or divert
Flight in Extreme Barometric Pressures
barometric pressure is lower than 28 or higher than 31 inches of mercury
Flight in Colder Than International Standard Atmosphere (ISA) Temperatures
outside air
temperature (OAT) colder than ISA minus 10°C, plan to fly at least 1,000 ft. above published
minimum altitudes obtained from terrain and IFR enroute charts (e.g. minimum enroute
altitudes (MEA), minimum obstruction clearance altitudes (MOCA), OROCAs or other
minimum safe altitudes during low-levels)
Class B Cloud Clearance/ visibility
3 SM
Clear of Clouds
Class E Cloud Clearance/ visibility (below 10,000’)
3 SM
500 ft. below,
1,000 ft. above, and
2,000 ft. horizontal
