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Center of gravity (CG) limits are specified longitudinal (forward and aft) and/or lateral (left and right) limits within which the aircraft's center of gravity must be located during flight. The CG limits are indicated in the airplane flight manual. The area between the limits is called the CG range of the aircraft. Weight and Balance
This is because each seat has a row number followed by letter; letters that may be confused with numbers (I, O, Q, S, or Z) must be avoided, usually for people with dyslexia. The Digital Equipment Corporation (DEC) was the first to implement this, avoiding I (1), O (0) and S (5). The remaining letters are called the DEC alphabet. [citation needed]
Also listed is the group's tail code—the noted letter would appear inside the geometric shape (for example, J means the letter J would appear inside a triangle). Some squadrons and groups also used specific color bands on the wings or empennage of their aircraft; such colorings are not presented here. Notes:
The symbol outline of the 313th Wing was a circle, that of the 58th Wing a triangle, and that of the 315th Wing a diamond. 20AF group letter identifiers: 58th Bomb Wing (triangle outline symbol): 40th BG - S, 444th BG - N, 462nd BG - U, 468th BG - I. 73rd Bomb Wing (square outline symbol, 10.5-foot letters):
Headquarters Squadron Marine Air Wing 2 7 November 1946, U.S. Navy Letter ACL 156-46 CVG-15, Carrier Air Group 15: 12 December 1946, U.S. Navy Letter ACL 165-46 Navy Air Reserve units at NAS Atlanta: November 1946 The "C" code issued to this NAS was a controlled duplicate of the same code letter given to Carrier Air Group 15.
A flying wing is a tailless fixed-wing aircraft that has no definite fuselage, with its crew, payload, fuel, and equipment housed inside the main wing structure. A flying wing may have various small protuberances such as pods, nacelles , blisters, booms, or vertical stabilizers .
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All airspace above FL195 is class C controlled airspace, the equivalent to airways being called Upper Air Routes and having designators prefixed with the letter "U". If an upper air route follows the same track as an airway, its designator is the letter "U" prefix and the designator of the underlying airway.