pilot-direction indicator
81United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …
82space exploration — Investigation of the universe beyond Earth s atmosphere by means of manned and unmanned spacecraft. Study of the use of rockets for spaceflight began early in the 20th century. Germany s research on rocket propulsion in the 1930s led to… …
83Non-directional beacon — Radio Tower of NKR Leimen Ochsenbach, Germany This symbol denotes an NDB on an aeronaut …
84Eastern Air Lines Flight 401 — CG render of N310EA as it enters the swamp Accident summary Date December 29, 1972 …
85Signals intelligence in modern history — This article is a subset article of the article Signals intelligence, which addresses the unifying conceptual and technical factors and common technologies in this intelligence discipline. This article deals with signals intelligence in the… …
86environment — environmental, adj. environmentally, adv. /en vuy reuhn meuhnt, vuy euhrn /, n. 1. the aggregate of surrounding things, conditions, or influences; surroundings; milieu. 2. Ecol. the air, water, minerals, organisms, and all other external factors… …
87Hot air balloon — This article is about hot air balloons themselves. For the associated activity, see hot air ballooning. For the rock opera, see Hot Air Balloon (rock opera). For the song, see Hot Air Balloon (song). Hot air balloon in flight …
88Paragliding — is a recreational and competitive flying sport. A paraglider is a free flying, foot launched aircraft. The pilot sits in a harness suspended below a fabric wing, whose shape is formed by the pressure of air entering vents in the front of the wing …
89Drogue parachute — A B 52H Stratofortress from the 307th Bomb Wing deploying its drag chute for landing …
90Ice protection system — Ice protection systems are designed to keep atmospheric ice from accumulating on aircraft flight surfaces while in flight. The effects of ice accretion on an aircraft can cause the shape of airfoils and flight control surfaces to change, which… …
