The commongear pumphassuch merits as simplestructure, lowcost, insensitiveoilpollution, etc. but it has such demerits as high flowpulsation, unbalancedradialforce, strong noise, etc.
Failing to appreciate how greatly the ebb and flow of commerce depends upon an efficient and safe aviation system, and possibly insensitive to the aggressive competition from foreign aerospace manufacturers seeking advances in ATC modernization, they argue there are more pressing problems that demand attention and dollars.