He developed and constructed the primary payload.

Trailblazer was the primary payload for the third attempted flight of a Falcon 1 launch vehicle.

The primary payload was the Upper Atmosphere Research Satellite.

It will be launched as a secondary payload, with the primary payload consisting of six Orbcomm satellites.

The primary payload of Proba-V is the Vegetation instrument.

The primary payload was furnished by Rincon Research, hence the name.

Three of five scientific instruments that constitute one of Discovery's primary payloads, valued at $160 million in all, are hampered by the recorder problem.

The launch had been postponed numerous times because the primary payload, EgyptSat 1, was not ready.

At the GTO, the primary payload will then be deployed, along with three secondary payloads.

On shuttle missions the primary payload is ordinarily released on the first or second day.