How do you calculate MEF in aviation?
MEFs are determined by taking the highest of the following: 1) The point of highest terrain within a quadrangle, adding 200 ft for obstacles which are not required to be portrayed, and then adding 100 feet for vertical error and then rounding up to the next hundred feet; or 2) The height of the highest manmade obstacle …
What is MEF on a sectional chart?
On VFR sectional charts the Maximum Elevation Fig- ure (MEF) gives pilots an obstruction-free altitude. The MEF is determined by rounding the highest elevation (or obstruction height) within the quadrangles of lati- tude and longitude to the next 100-foot level.
How much clearance does a MEF give you?
100′
The Maximum Elevation Figure (MEF), identifies the highest elevation within a quadrant on a chart. In theory, flying at the MEF guarantees you a minimum of 100′ of clearance from all-terrain and obstacles in the quadrant. Sectional chart quadrants are bounded by every 30 minutes of latitude and 30 minutes of longitude.
What is an MEF aviation?
Maximum Elevation Figure (MEF): Depicted on a sectional chart, the MEF shows the height of the highest feature within a quadrangle and is printed in thousands and hundreds of feet above mean sea level (MSL).
What is pressure altitude in aviation?
Pressure Altitude is the indicated altitude when an altimeter is set to 29.92 in Hg (1013 hPa in other parts of the world). It is primarily used in aircraft performance calculations and in high-altitude flight. Density Altitude is formally defined as “pressure altitude corrected for nonstandard temperature variations.”
What is the minimum safe altitude anywhere over congested areas?
1,000 feet
91.119 Minimum safe altitudes; general (b) Over congested areas – Over any congested area of a city, town, or settlement, or over any open-air assembly of persons, an altitude of 1,000 feet above the highest obstacle within a horizontal radius of 2,000 feet of the aircraft.
What is the difference between air pressure and pressure altitude?
Altitude is defined most simply as the height that an object occupies above the sea, or in some cases, ground level. It has a relationship with air pressure. As altitude increases, the amount of air pressure that you are exposed to falls. Therefore, altitude and pressure are regarded as being inversely proportional.
How do you explain pressure altitude?
Pressure altitude is the indicated altitude when an altimeter is set to 29.92 (1,013.2 mb). It is the height above the standard datum plane; it can also be determined by applying a correction factor to the indicated altitude displayed when it is set to the reported altimeter setting.
What does the star mean on a sectional chart?
QUESTION: On a VFR sectional chart, you see a star symbol next to the control tower frequency. What does that star symbol tell you? ANSWER: The star symbol tells you that control tower operation is part time only. ( Source: Aeronautical Chart User’s Guide, page 9)
What does MEF stand for in aviation?
Maximum elevation figure or MEF is a type of VFR altitude which indicates the height of the highest feature within a quadrangle area. It is of interest to pilots, who want to be aware of the highest mountain peaks and tall towers nearby, so that they can fly above them to avoid controlled flight into terrain.
What does MEF 4700 mean in aviation?
MEF’s of 4700 and 3300 feet are shown on this excerpt from the FAA’s Los Angeles sectional aeronautical chart. Maximum elevation figure ( MEF) is a type of visual flight rule (VFR) information that indicates the elevation of the highest geographical feature within a GEOREF quadrangle area.
What is MEF (maximum elevation figure)?
Maximum elevation figure ( MEF) is a type of visual flight rule (VFR) information that indicates the elevation of the highest geographical feature within a GEOREF quadrangle area.
How do you calculate MEF on a runway?
When a man-made obstacle is the highest obstacle within a quadrant, the FAA uses the following formula to calculate the MEF: Obstacle height (MSL) + 100ft. Round up to the next highest 100 feet and you have the MEF. For example: Obstacle 750ft + 100ft = 850ft – Round up to 900ft.