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The 1975 Apollo–Soyuz Test Project version of the Soyuz spacecraft (Soyuz 7K-TM) served as a technological bridge to the third generation Soyuz-T (T - транспортный, Transportnyi meaning transport) spacecraft (1976–1986).

Soyuz 7K-TM
Soyuz 19 (Apollo Soyuz Test Project) spacecraft.jpg
Soyuz 19, a Soyuz 7K-TM spacecraft, during the Apollo–Soyuz Test Project (ASTP).
ManufacturerOKB-1
Country of originSoviet Union
OperatorSoviet space program
ApplicationsManned spacecraft
Specifications
Dimensions
Height
7.48 m (24.5 ft)
Diameter
2.72 m (8 ft 11 in)
Volume
9 m3 (320 cu ft)
RegimeLow Earth
Production
StatusRetired
Launched5
Retired5
First launchKosmos 638
3 April 1974
Last launchSoyuz 22
15 September 1976
Last retirementSoyuz 22
23 September 1976
Related spacecraft
Derived fromSoyuz 7K-T
DerivativesSoyuz 7K-S
Soyuz 7K-ST

The Soyuz ASTP spacecraft was designed for use during the Apollo Soyuz Test Project as Soyuz 19. It featured design changes to increase compatibility with the American craft. The Soyuz ASTP featured new solar panels for increased mission length, an APAS-75 docking mechanism instead of the standard male mechanism and modifications to the environmental control system to lower the cabin pressure to 0.68 atmospheres (69 kPa) prior to docking with Apollo. The ASTP Soyuz backup craft flew as the Soyuz 22 mission, replacing the docking port with a camera.

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