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FAR 91.119 Minimum Safe Altitudes: General.
最低安全高度: 義務付けられている最低飛行高度は?

 (1) どこでも、Anywhere! エンジンが故障した際、地上にいる人間や資産(不動産など)に危害を与えずに緊急着陸が出来る高度。
 (2) 人口密集地 Congested Area、Desely Populated Areaでは、
 (3) 人口密集地以外では
 (4) 海上(Open Water)やひと気の無い範囲(Sparesely Populated Area)では、
             人、船、自動車、建物から500 feet以上離れて飛 行する事。

FAR 91.119   Minimum safe altitudes: 最低安全飛行高度

注意: 1000 feet有ればOKと勘違いしてしまいそうですが、現実はEngineが故障しても地上のものに危害を加えない高度ですよ。

Except when necessary for takeoff or landing, no person may operate an aircraft below the following altitudes:

(a) Anywhere. An altitude allowing, if a power unit fails, an emergency landing without undue hazard to persons or property on the surface.
(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.
(c) Over other than congested areas. An altitude of 500 feet above the surface, except over open water or sparsely populated areas. In those cases, the aircraft may not be operated closer than 500 feet to any person, vessel, vehicle, or structure.
(d) Helicopters. Helicopters may be operated at less than the minimums prescribed in paragraph (b) or (c) of this section if the operation is conducted without hazard to persons or property on the surface. In addition, each person operating a helicopter shall comply with any routes or altitudes specifically prescribed for helicopters by the Administrator.


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