In aeronautics, limit load (LL) is the maximum load factor authorized during flight, Mathematically, limit load is LL = LLF x W, where LL = limit load, LLF = limit load factor, and W = weight of the aircraft.
Limit load is constant for all weights above design gross weight. The limit load factor is reduced if gross weight is increased. But the LLF cannot be increased if the gross weight is decreased below the design gross weight. Engine mounts and other structural members are designed for the nominal LLF. The nominal or limit load Bn is the load which should only occur once (or only a very few times) during the lifetime of an aircraft. Bn may therefore only occur once during (e.g.) 60,000 hours of flying. No plastic deformation is allowed at this level of a load.
The limit load can be found relatively easily by statistically analysing the data collected during the many hours of logged flights (which is continuously being gathered).
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Other articles related to "limit load, load":
... Limit load is the maximum load that a structure can safely carry ... It's the load at which the structure is in a state of incipient plastic collapse ... As the load on the structure increases, the displacements increases linearly in the elastic range till the load attains the yield value ...
1969, during a fuselage upbending test, the wing failed at 128% of limit load, which is below the requirement that it sustain 150% of limit load ... the wing, but in a later test, in July 1970, it failed at 125% of limit load ... A passive load reduction system, involving uprigged ailerons was incorporated, but the maximum allowable payload was reduced from 220,000 pounds to 190,000 pounds ...
... to trackers which didn't need it Core
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