Terms & Abbreviations: E

E. Copps

See Copps, Ed

ECS

Environmental control system.

EMS

Entry Monitoring System. A CM system used during re-entry into the Earth's atmosphere.

Erasable memory

The Apollo Guidance Computer had a small amount of "erasable memory" analogous to the RAM in a modern computer.

EVA

Extra-vehicular activity, such as space-walks and moon-walks.