The four major subsystems are carried out at different locations, by different personnel, and therefore formed 'natural' boundaries.

Other major subsystems in the E-3 Sentry are navigation, communications, and computers.

"They both have many complementary and, in some cases, truly competitive major subsystems," the senior official said.

The Holosuites and holodecks utilize two major subsystems: the holographic image and the conversion of matter.

"There simply are too many of the major subsystems that can only be produced by large businesses," Mr. Cooper said.

On 10 October 2003, the technical board of the project selected the suppliers of major subsystems.

By the third quarter of 1964, all 8 major subsystems of the propulsion systems were completed, so were the directional and depth control systems.

Other major subsystems in the E-767 are identification, tactical data link, and navigation.

All right, these are the four major subsystems.

Beginning in March 2011, Gray Eagles started showing poor reliability across all major subsystems.