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The outer edges of the diagram, the envelope, show the possible conditions that the aircraft can reach in straight and level flight. For instance, the aircraft described by the black altitude envelope on the right can fly at altitudes up to about 52,000 feet (16,000 m), at which point the thinner air means it can no longer climb.
The aircraft Mach number at which these effects appear is known as its critical Mach number, or M CRIT. The true airspeed corresponding to the critical Mach number generally decreases with altitude. The flight envelope is a plot of various curves representing the limits of the aircraft's true airspeed and altitude. Generally, the top-left ...
It has been widely misunderstood that flight below maneuvering speed will provide total protection from structural failure.In response to the destruction of American Airlines Flight 587, a CFR Final Rule was issued clarifying that "flying at or below the design maneuvering speed does not allow a pilot to make multiple large control inputs in one airplane axis or single full control inputs in ...
China Airlines Flight 006 damaged by going outside its flight envelope to gain control after a drop of 3,000 m in 20 seconds. Flight envelope protection is a human machine interface extension of an aircraft's control system that prevents the pilot of an aircraft from making control commands that would force the aircraft to exceed its structural and aerodynamic operating limits.
At 180 knots (333 km/h; 207 mph) level flight, it could enter a 1.4 g bank turn with the rotor in autorotation, increasing rotor rpm. [5] Airframe stress prevented rotor speed reduction and thus full flight envelope expansion. [5] The XH-59A had high levels of vibration and fuel consumption. [6] [3] The 106-hour test program for the XH-59A ...
Wellington Mk.X HE239 of No.428 Sqn. RCAF, illustrating the geodetic construction and the level of battle damage it could sustain and still return to base. The earliest-known use of a geodetic airframe design for any aircraft was for the pre-World War I Schütte-Lanz SL1 rigid airship's envelope structure] of 1911, with the airship capable of up to a 38.3 km/h (23.8 mph) top airspeed.
A blank and a filled-out example of a US en-route flight progress strip. There are many styles of progress strip layouts, but minor differences aside, a strip contains at least: Aircraft identification (e.g. aircraft registration or a flight number) Aircraft type as the relevant 4-letter ICAO designator (e.g. B744 for a Boeing 747-400)
An aircraft flight manual (AFM) is a paper book or electronic information set containing information required to operate an aircraft of certain type or particular aircraft of that type (each AFM is tailored for a specific aircraft, though aircraft of the same type naturally have very similar AFMs). The information within an AFM is also referred ...
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