AKA: Donbass (Donbass - River Don basin);Mir EO-4;Soyuz TM-7 (Krikalyov, Volkov Aleksandr). Launched: 1988-11-26. Returned: 1989-04-27. Number crew: 2 . Duration: 151.47 days.
Crew members Alexander Volkov and Sergei Krikalyov were delivered to Mir together with French Aragatz cosmonaut Jean-Loup Chretien aboard Soyuz TM-7. The initial orbit of the Soyuz was 194 X 235 km. Thereafter the spacecraft maneuvered to a rendezvous orbit of 256 X 291 km before docking with Mir in 337 X 369 km at 17:16 GMT 28 November. Chretien returned together to earth together with the EO-3 crew on 21 December. Volkov, Krikalyov, and Polyakov returned to Earth on 27 April, 1989.
Narrative (adapted from D S F Portree's Mir Hardware Heritage, NASA RP-1357, 1995)
Soyuz-TM 7 arrived at Mir on November 28, 1988 on the Franco-Soviet Aragatz mission with French cosmonaut Jean-Loup Chretien (on his second mission to a Soviet space station) and Soviet cosmonauts Alexander Volkov and Sergei Krikalyov. This increased Mir's population to six. According to Krikalev, this was the 'worst-case scenario' as far as crowding on the station was concerned. Not only were there more cosmonauts than usual aboard Mir; the station was also full of equipment and life support supplies delivered by Progress freighters for the joint Franco-Soviet mission. The crowding was exacerbated because there was no docking port free for a Progress freighter. Therefore, the crew could not use a Progress as a 'pantry' or 'storage room' for the station. The large joint experiment manifest—mostly medical and technology experiments chosen to support the French-led European Space Agency Hermes shuttle project—strained Mir's electricity supply. The total mass of the experiments was 580 kg.
Preparations for the first EVA involving a non-Soviet/non-U.S. space traveler forced the cosmonauts to cut short a TV meeting with diplomats from 47 countries on December 8. On December 9 Chretien and Volkov depressurized the multiport docking adapter and clambered outside Mir. Chretien was first out. He installed handrails, then attached the 15.5 kg Enchantillons experiment rack to the handrails by springs and hooks. He also attached electrical wires leading from the rack to Mir's power supply. Enchantillons carried five technological experiments with applications to the Hermes shuttle program. Volkov and Chretien then assembled the 240-kg ERA experiment. They attached a mount to handrails on the frustum linking the multiport docking unit to the small-diameter portion of the work compartment. After resolving problems with cables linking ERA to a control panel inside Mir, they attached the folded ERA structure to a support arm on the platform. The structure was designed to unfold to form a flat six-sided structure 1 m deep by 3.8 m across. From inside Mir, Krikalyov commanded the structure to unfold, but to no avail. Volkov then kicked ERA, causing it to unfold properly. According to Krikalyov, taking the ERA outside helped relieve the crowding problems. The EVA lasted 5 hr and 57 min.
After the EVA, Titov and Manarov showed Krikalyov, and Volkov the peculiarities of living and working on Mir. On December 15, their 359th day in space, Titov and Manarov officially beat Romanenko's 326-day single-flight endurance record by the required 10%. On December 19, Soyuz TM-6 was powered up to prepare it for descent.
Manarov, Titov, and Chretien boarded Soyuz TM-6 and undocked at 03:33 GMT 21 December 1989, but revised software installed as a result of the Soyuz TM-5 abort overloaded the spacecraft's computer. The landing planned for 06:48 was aborted. A backup software program was used and the Soyuz orbital module was retained through retrofire. The crew finally landed safely on December 21, 1988 09:57 GMT, under low clouds, in sub-freezing temperatures, 180 km SE Dzhezkazgan.
The Progress 39 freighter arrived at the station and remained docked to the aft port from December 27, 1988-February 7, 1989. Progress 39 was used to boost Mir's orbit, necessary because of greater than normal atmospheric drag. This in turn was caused by atmospheric expansion produced by atmospheric heating, the result of solar activity during the solar maximum period. According to Krikalyov, it was not possible to visually detect any difference in the station's altitude after the reboost was completed. Krikalyov, Volkov, and Polyakov then cleaned Mir and loaded Progress 39's orbital module with waste and excess equipment used on the joint Franco- Soviet Aragatz mission.
Following the completion of the successful first flight of the Buran shuttle, during February the Cosmos 1897 Altair/SR satellite was moved from 12 deg E to its original position at 95 deg E. Progress 40 arrived at the station and remained docked from February 12-March 3, 1989.
In mid-February the Soviets announced that launch of the D-module (also called the augmentation module, or Kvant 2) was the victim of delays in the production of the module to be added after it, the T-module (technology module, or Kristall). The D-module had been at Baikonur, awaiting launch, since July 1988, but the T-module would not be ready until December 1989, and the Soviets did not wish to let 3 months go by with Mir in an asymmetrical configuration (that is, with only one lateral port filled). Rather than handing over to another Principal Expedition crew, the EO-4 cosmonauts would mothball Mir and return to Earth at the end of their stint.
Krikalyov and Volkov had been trained to perform a total of six EVAs during Mir Principal Expedition 4. Krikalyov was to have been the first cosmonaut to fly the Soviet equivalent of the NASA manned maneuvering unit (MMU), the YMK. But delay of Kvant 2, which carried the YMK, pushed back the EVAs to the next Principal Expedition, the crew for which would consist of Krikalyov and Volkov's backups. In February the cosmonauts extended a 10-m pole from the Mir base block's small airlock. It carried sensors used as part of the Diagramma program to characterize the environment around Mir.
On March 3, when Progress 40 backed away from Mir, it deployed an antenna consisting of two loops of wire, each 20 m across, from a pair of containers on either side of the Progress cargo module. The cosmonauts observed the deployment. During the two days before its destructive reentry, Progress 40 continued in free flight while characteristics of the antenna were assessed by the TsUP.
Progress 41 arrived at the station and remained docked from March 18-April 21, 1989 On April 10 Soviet reports had the cosmonauts beginning the process of preparing Mir for unmanned operation. Also during this period the cosmonauts replaced power supply units which were nearing the end of their design lives. Heightened solar activity led to some concern over the cosmonauts' safety, but Soviet sources stated that radiation levels were not hazardous. The engine on Soyuz TM-7 was used to boost the Mir complex to a new record mean altitude of 410 km in mid-April. Volkov, Krikalyov, and Polyakov then loaded Soyuz TM-7 with experiment results and film and returned to Earth. The landing was unusually rough because of high winds in the recovery zone. Krikalyov sustained a minor knee injury, though he downplayed its importance.
From April 26-August 25, 1989, although unmanned, astronomers on Earth used Mir's Kvant astrophysical instruments to study Supernova 1987a and conduct more than 70 other observations. Progress-M 1 docked to the forward port of Mir from August 25-September 6, 1989. This was the first flight of a modified Progress freighter. It became the first of its class to dock with the front port of a space station. While there, it topped off the station's attitude control propellant tanks.
Mir Expedition EO-04. Carried Alexander Volkov, Sergei Krikalev, Jean-Loup Chretien to Mir; returned Volkov, Krikalev to Earth. Initial Orbit: 194 X 235 km. Thereafter maneuvered to rendezvous orbit 256 X 291 km before docking with Mir in 337 X 369 km at 17:16 GMT 28 November.
Soyuz TM-6 landed at 09:57 GMT with the crew of Chretien, Manarov and Titov Vladimir aboard. Undocked from Mir 21 December 1989 at 03:33 GMTwith the crew of Chretien, Manarov and Titov Vladimir aboard. Revised software installed as a result of TM-5 abort overloaded computer. Landing planned for 06:48 aborted. Backup program used. Orbital Module retained through retrofire. Landed December 21, 1988 09:57 GMT, 180 km SE of Dzhezkazgan.
Unmanned resupply vessel to Mir. Made second test of Buran ejection seat during ascent to orbit. The K-36M.11F35 seat was installed in an 'experimental droppable compartment' installed in place of the Launch Escape Tower engine on top of the shroud. Rendezvous orbits 187 X 237 km, 51.63 deg; 236 X 338 km; 325 X 353 km at Mir. Delivered 1,300 kg cargo. Docked with Mir on 27 Dec 1988 05:35:10 GMT. Undocked on 7 Feb 1989 06:45:34 GMT. Destroyed in reentry on 7 Feb 1989 13:49:00 GMT. Total free-flight time 2.35 days. Total docked time 42.05 days.
Unmanned resupply vessel to Mir. Conducted third test of Buran ejection seat during ascent to orbit. The K-36M.11F35 seat was installed in an 'experimental droppable compartment' installed in place of the Launch Escape Tower engine on top of the shroud. Docked with Mir on 12 Feb 1989 10:29:38 GMT. Undocked on 3 Mar 1989 01:45:52 GMT. Unfurled experimental space mirror petal structure on undocking. Destroyed in reentry on 5 Mar 1989 01:59:00 GMT. Total free-flight time 4.08 days. Total docked time 18.64 days.
Unmanned resupply vessel to Mir. Conducted fourth test of Buran ejection seat during ascent to orbit. The K-36M.11F35 seat was installed in an 'experimental droppable compartment' installed in place of the Launch Escape Tower engine on top of the shroud. Delivered Bulgarian Spektr 256 spectrometer, power supplies for failed equipment. Docked with Mir on 18 Mar 1989 20:50:46 GMT. Between April 9 and 17 boosted Mir into a 373 X 416 km storage orbit after the decision was made to delay remanning the station. However these maneuvers resulted in the spacecraft running out of fuel. Undocked on 21 Apr 1989 01:46:15 GMT. Destroyed in uncontrolled decay of orbit on 25 Apr 1989 12:12:00 GMT. Total free-flight time 6.52 days. Total docked time 33.21 days.