Intelsat 4 - Credit: Intelsat. 22,128 bytes. 274 x 340 pixels.

The Intelsat 4 series continued the growth of the Intelsat communications network. The series included the first commercial communications satellite built outside of the United States (F4 was assembled by British Aircraft Corporation). Operational lifetimes were: F1 - 3 years for ITSO, then leased out; F2 - 12 years; F3 - 12 years, then placed into orbital storage; F4 - over 7 years; F5 - over 7 years ; F6 - 0 years (failed to orbit); F7 - over 6 years, then placed into orbital storage; F8 - 9 years (?). Spacecraft: Spin stabilised with a despun antenna structure. Hydrazine propulsion system. Passive thermal control. Body mounted solar cells. Payload: Twelve transponders. Multiple access.4000 voice circuits or 2 TV channels.

Design Life: 7 years. Total Length: 5.3 m. Maximum Diameter: 2.4 m. Total Mass: 1,410 kg.

Stationed at 24.5 deg W. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit

Over Atlantic. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit

Over Pacific. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit

Over Indian Ocean. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit

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Intelsat 4 Credit: Intelsat. 17,887 bytes. 202 x 336 pixels.

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Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit

Staging electrical disconnect. Launch vehicle was to have put payload into geosynchronous transfer orbit

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit

• 126 - Bramscher, Robert G, Spaceflight, "A Survey of Launch Vehicle Failures", 1980, Volume 22, page 351.