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18 When considering air: 1. Air has mass. 2. Air is not compressible. 3. Air is able to flow or change its shape when subject to even small pressures. 4. The viscosity of air is very high. 5. Moving air has kinetic energy. The correct combination of all true statements is: [A] 1 and 4. [B] 1, 3 and 5. [C] 2, 3 and 4. [D] 1, 2, 3 and 5.
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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.
25 sty 2024 · A flight level (FL) is a standard pressure altitude, expressed as three numbers. Aircraft flying on flight levels all measure their altitude from the same pressure setting, 1013.2 Hpa (or 29.92 InHg).
If “Y” or “Z” is used, specify, in the route section of the flight plan, the point (s) where a change in flight rules is planned. Similarly, where there is more than one change in the type of flight rules, the code to be used is to reflect the first rule, i.e., use “Z” for VFR/IFR/VFR.
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.
Definition. Altimeter Temperature Error Correction is applied to altimeters to compensate for error caused by deviation from International Standard Atmosphere (ISA) conditions.
