- Отрасли: Aviation
- Number of terms: 16387
- Number of blossaries: 0
- Company Profile:
Aviation Supplies & Academics, Inc. (ASA) develops and markets aviation supplies, software, and books for pilots, flight instructors, flight engineers, airline professionals, air traffic controllers, flight attendants, aviation technicians and enthusiasts. Established in 1947, ASA also provides ...
Forecasting by digital computers solving mathematical equations. Numerical weather prediction is used extensively in weather services throughout the world.
Industry:Aviation
Four digits representing the hours and minutes of Coordinated Universal Time (UTC), based on the 24-hour clock system. In this system, the day begins at 0000 and ends at 2359, and is the time along the prime meridian. The FAA uses UTC for all operations and identifies it as Zulu time, or Z time. For example, 0205Z indicates the reference time of 2:05 a.m.
The word “local” or the time zone equivalent is used when local time is given during radio and telephone communications. When written, a time zone designator is used to indicate local time. For example, 0205M is 2:05 a.m. mountain standard time.
Industry:Aviation
Frequencies for radio transmission recognized by most nations as universal frequencies for distress, or emergency, purposes.
In the low-frequency band, 500 kilohertz is the distress frequency. In the VHF (very high frequency) band, it is 121.5 megahertz, and in the UHF (ultra high frequency) band, it is 243.0 megahertz. These distress (or emergency) frequencies are continuously monitored by many military and commercial radio operators.
Industry:Aviation
Frequencies of electromagnetic radiation between 300 and 3,000 megahertz. The wavelengths for ultrahigh frequencies range between 100 and 10 centimeters.
The UHF band is between the VHF (very-high-frequency) and the SHF (super-high-frequency) bands.
Industry:Aviation
Frequencies of mechanical vibrations that can be heard by the human ear. Sonic frequencies are normally considered to be those between 20 hertz and 20,000 hertz (20 kHz).
Industry:Aviation
Frequencies of vibration higher than the human ear can hear. Ultrasonic frequencies are normally considered to begin at 20,000 hertz.
Industry:Aviation
Frequencies of vibration lower than those in the audible range. Infrasonic frequencies were formerly called subsonic frequencies.
Industry:Aviation
Fuel in an aircraft fuel system that will not flow to the fuel metering system when the aircraft is in its normal flight attitude. This fuel is also called residual fuel. The weight of unusable fuel is included in the empty weight of the aircraft.
Industry:Aviation
