Devices that record and analyze aircraft system performance for maintainers are proliferating as their costs decrease and harvesting the data gets easier. From high-end health and usage monitoring systems (HUMS) found in military and heavy civilian helicopter fleets to simple, inexpensive boxes that fit under the seat of a light single-engine airplane, the newest generation of these so called “tattletale” boxes exploits cheap digital memory and the latest wireless communications modes to ...


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