![]() Care must be taken to prevent the jack from tipping over. If the aircraft has spring steel landing gear and it is jacked at the wheel, the landing gear will slide inward as the weight is taken off the tire. Extra care must be used when raising an aircraft on jacks for weighing. However, many aircraft are weighed by jacking the aircraft up and then lowering them onto scales or load cells. This eliminates the problems associated with jacking the aircraft off the ground. If an aircraft is to be weighed with load cells attached to jacks, the technician should check both the load cell instruction manual and aircraft maintenance manual to make sure it is permissible to jack the aircraft with the fuel tanks full as this may add additional stress to the aircraft structure.Īircraft are often weighed by rolling them onto ramps in which load cells are embedded. If the weight of the fuel is in question, a hydrometer can also be used to determine the weight of each gallon of fuel, while the Aircraft Specifications or TCDS can be used to identify the fuel capacity of the aircraft. If an aircraft is weighed in this condition, the technician can mathematically subtract the weight of usable fuel and account for its arm and moment. ![]()
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