base altitude的意思|示意

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Base Altitude

Base altitude is an important concept in aviation. It is the lowest altitude at which an aircraft is required to fly. It is normally determined by the regulations of the country in which the aircraft is flying, and the altitude is typically expressed as a flight level.

When an aircraft is flying at any altitude above this base altitude, it is said to be \\" flying under IFR\\" (instrument flight rules). This means that the aircraft is equipped with all the necessary instruments and navigational aids required to fly safely in the air.

In the US, base altitude is usually set to 1000ft above ground level, but in other countries, it is often higher. For example, in the UK, it is typically 3000ft.

When flying under IFR, an aircraft must be able to maintain a minimum safe altitude and must be able to navigate accurately and safely. If an aircraft is below its base altitude, it is said to be \\"flying under VFR\\" (visual flight rules). This means that it must maintain a minimum safe altitude, and it must stay within sight of the ground.

The base altitude is important for safety, as it ensures that aircraft remain at a safe altitude and are not a hazard to other aircraft. It is also important for efficient navigation, as it ensures that an aircraft can operate safely in different airspaces and countries and remain within the legal limits.