898. Weighing in Place – Airline


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J R McCarty: 898. Weighing in Place – Airline. 1971.



This paper discusses the implementation of an idea to permit the weighing of an airplane, utilizing load cells, while it remains on jacks during an overhaul at maintenance operation. The concept is basically that of a jack within a jack, probably is not really all that startling, but to the writer’s knowledge, has not been utilized before.
Fixtures and small, low profile, short stroke, jacks were designed by a United Air Lines tool designer. Fabrication was done by outside concern. The fixtures are threaded on to the screw extension of the standard aircraft tripod jack and become a part of the jack. When it is time to weigh the airplane, the small jacks and load cells are inserted in the fixtures, the airplane is raised slightly, approximately 1/32 inch, transferring the weight to the load cells and the weight readings taken. Airplane down time for the weighing was forecast to be in the order of ten minutes.
This method, which we call ‘weighing in place’, has been used by United Air Lines since October of 1970, has been very successful, and was approved by our local FAA in February of 1971.


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