When the USSR started working on Mir they were also working on the Buran shuttle program.
APAS-89 was envisioned to be the docking system for Buran with the Mir space station.
The APAS-75 design was heavily modified.
The outer diameter was reduced from 2030 mm to 1550 mm and the alignment petals were pointed inward instead of outward.
This limited the internal passage diameter of the docking port to about 800 mm.
The Buran shuttle was finally canceled in 1994 and never flew to the Mir space station, but Mir's Kristall module was outfitted with two APAS-89 docking mechanisms.
The Mir Docking Module, basically a spacer module between Kristall and the Shuttle, also used APAS-89 on both sides.
When the USSR started working on Mir they were also working on the Buran shuttle program. APAS-89 was envisioned to be the docking system for Buran with the Mir space station. The APAS-75 design was heavily modified. The outer diameter was reduced from 2030 mm to 1550 mm and the alignment petals were pointed inward instead of outward. This limited the internal passage diameter of the docking port to about 800 mm. The Buran shuttle was finally canceled in 1994 and never flew to the Mir space station, but Mir's Kristall module was outfitted with two APAS-89 docking mechanisms. The Mir Docking Module, basically a spacer module between Kristall and the Shuttle, also used APAS-89 on both sides.
Androgynous Peripheral Attach System