DESIGNERS and vendors of aircraft parts need both foresight and pessimism, Dr. Klein feels, if they are not to violate the fundamentals of safety, weight, manufacturability, and serviceability in manufacturing aircraft.
Safety requires that gadgets work not only if they are treated properly but even if they are neglected or misused.
Weight is so important that it justifies an incredible amount of work in engineering and the shop to save it.
Airplane manufacturers are harassed by several problems that must be kept in mind by designers. The manufacturer must schedule and keep track of a great number of parts. The parts must fit after they are made. Some operations cause parts to expand, others to shrink, making the problem of assembly a major one - made even more difficult if there are serious deflection troubles.