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 also will lead the Orbit 1/Entry team the day before landing to oversee entry preparations.

The Orbit 2 team will be led by Flight Director James M. (Milt) Heflin. The Orbit 2 team will be prime for EVA operations should a spacewalk by crew members Dr. Kathryn Sullivan and Bruce McCandless become necessary. The Orbit 1 team will be prime for Hubble Space Telescope deploy operations.

The Planning Team, which for the most part operates during the crew's sleep shift, will be led by Flight Director Alan L. (Lee) Briscoe.

STS-31 will mark the first mission since the early days of the Shuttle program in which the responsibility for electrical and environmental systems will be divided into two console positions, called EFECOM and EGIL. The position known as EECOM--for Environmental Engineer and Consumables Manager--will continue to have responsibility for the life support systems aboard Discovery, as well as cabin pressure, active and passive thermal control systems (such as the Flash Evaporator System), and the Management of the supply and waste water tanks.

The EGIL position--for Electrical Generation and Illumination--has responsibility for operation of the three fuel cells, the DC buses and AC power inverters, and the overall electrical system aboard the Orbiter. EGIL also will be responsible for the Master Caution and Warning System.

The flight control positions in the Mission Control Center, their call signs and their functions are:

Has overall responsibility for the conduct of the mission.

By tradition an astronaut; responsible for all voice contact with the flight crew.

Responsible for procedures and crew timelines; provides expertise on flight documentation and checklists; prepares messages and maintains all teleprinter and/or Text and Graphics System traffic to the vehicle.

This is a speciality position which sometimes operates at