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23 kwi 2020 · The latest and most appropriate Regional Pressure Setting value is to be used for checking terrain clearance in flight. Aircraft flying in a Control Zone or TMA at an Altitude at or below the Transition Altitude will be given the appropriate QNH setting in their clearance to enter the Zone/TMA.
The table below indicates air pressure at elevations below and above sea level. Altitude Above Sea Level Absolute Barometer Absolute Atmospheric Pressure.
The air pressure is computed assuming an International Standard Atmosphere pressure of 1013.25 hPa (29.92 inHg) at sea level, and therefore is not necessarily the same as the aircraft's actual altitude, either above sea level or above ground level.
Flight Level. Areas activated by NOTAM are shown with a broken boundary line. Low Level Corridor or Special Route.................................................................................................
Figure 9-9. Power versus climb rate. airplane, the rate of climb depends on the difference between the power available and the power required, or the excess power. Of course, when the excess power is zero, the rate of climb is zero and the airplane is in steady, level flight.
The Aeronautical Charts & Data function, under licence from the CAA, control the scheduled production of maps and charts for both the Visual Flight Rules (VFR) series and the Aeronautical Information Publication (AIP).
Strictly speaking a flight level is an indication of pressure, not of altitude. Only above the transition level (which depends on the local QNH but is typically 4000 feet above sea level) are flight levels used to indicate altitude; below the transition level feet are used.
