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TOPIC: International Space Station
Blobrana


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RE: ISS oxygen
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The crew of the International Space Station (ISS) burn two oxygen cartridges daily.
"Because of the limited lifespan of so-called solid fuel oxygen generators, or oxygen cartridges, the crew have burned two cartridges daily of late".
The use of solid fuel oxygen generators is indispensable for maintaining the air balance the station, where the oxygen regeneration system has failed from time to time.
"On Monday Sergei Krikalyov and John Phillips will check the pressure measuring unit of the oxygen system," - representative of Mission Control.
The failing Electron Russian oxygen regenerating system poses no threat to crews of the ISS.
Almost all the previous crews on board the station provided maintenance for this complicated system. And Sergei Krikalyov and John Phillips are not an exception either.
"This is known to be a long-standing problem, and one of the defective units is to be replaced in June. However, the air balance is all right on board now as it was a year ago. Otherwise, we would have decided to return the astronauts to the Earth. The Progress M-52 cargo ship has delivered three times as much oxygen supply as usual, consequently there are not and will not be any problems with air supply on board".

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Blobrana


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RE: ISS
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The failure of an oxygen generator on the International Space Station will force the crew to switch to a backup oxygen generator system next week.

The crew has been using oxygen from a Progress spacecraft docked to the station, but that source of oxygen will be exhausted by Monday.
The crew will then turn to another backup system, "candles" that generate oxygen through an exothermic chemical reaction. Such candles were used on the Mir space station; one caused a fire on the station in 1997 that briefly threatened the crew.
There are enough candles on the station to support the crew until a new Progress spacecraft is launched next month, carrying additional oxygen supplies.
The crew can also draw upon oxygen stored in the Quest airlock module if needed.


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Anonymous

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Noisy ventilators inside the International Space Station's Zvezda (Star) crew module will be fitted with special vibration insulators. Members of the eleventh ISS expedition, i.e. Sergei Krikalev and John Phillips, will install these devices, thereby reducing noise levels.
"Previously, cosmonauts used a special instrument for measuring ISS-module noise levels. Such readouts made it possible to compile an ISS noise map. Mission-control experts then said that all ISS ventilators must be fitted with special vibration insulators. Previous ISS crews also tackled this problem, reducing noise levels a great deal," a spokesperson for the Russian mission-control centre noted..
The ISS has been plagued by high noise levels since its inception.
"Some cosmonauts, who have visited the station, complained of nerve-racking noise from ISS mechanisms and equipment."
At the same time, other crew members believe that this problem is far-fetched. They do not even use ear inserts being recommended by doctors.
"Looks like, everything depends on individual traits," the mission-control spokesman added in conclusion.


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Blobrana


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Mission managers say the oxygen generator unit has failed for good. Consequently, Russian cosmonaut Sergei Krikalev and U.S. astronaut John Phillips will be relying on reserves until replacement parts arrive at the station in late August.
The reserves should last well beyond the scheduled mid-June arrival at the station of a Russian space freighter with additional supplies; oxygen supplies in a Progress cargo carrier now at the outpost will last until May 22 or May 23.
The crew also is equipped with oxygen generators that work like drop-down emergency air supplies on commercial airliners. Supplies from those would last until early July. Beyond that, there is a 100-day oxygen supply in tanks attached to the station U.S. Quest airlock.
Total air supply now onboard: About 140 days.


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Blobrana


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As a follow up to the orbital height increase story….

The International Space Station has increased its orbit altitude by 1.3 kilometres.
The rise went smoothly, according to preliminary information from the Houston centre. The station and the Progress cargo craft remained docked together for the purpose. The Progress engine fired for their scheduled 175 seconds to get the orbit up to its calculated 354 kilometres above Earth.


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Blobrana


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The oxygen generator on the orbiting International Space Station has broken down, but there is no danger to its two-man crew, Sergei Krikalev and John Phillips of the United States who arrived there in April.
"All the systems of the ISS are operating well, with the exception of the Elektron" oxygen generator. It is hoped that the faulty component would be replaced next month.
The orbiting station was supplied with three times its normal reserves of oxygen by the supply vessel Progress in March.
The ISS is a manned outpost in low-earth orbit, assembled from modules hauled up by the space shuttle.
The loss of the Columbia shuttle in 2003 significantly delayed the timetable for completing the ISS and its soaring financial cost has raised questions as to whether it will ever be finished.


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Blobrana


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The flight altitude of the International Space Station (ISS) will be increased by 800 metres on Wednesday, 11th May 2005.
"The operation for the scheduled raising of the ISS's orbit is set for 6:27 p.m. Moscow time May 11. The correction will be effected by attitude control thrusters of the Progress M-52 cargo ship docked with the ISS."
Initially the prime purpose of this space manoeuvre was to put the station in the optimum trajectory of linking with the shuttle Discovery.
But NASA once more postponed the launching of the space shuttle scheduled for May 22. Now it cannot take place earlier than July 14 to 31.
The launching of the next Russian space supply craft, Progress M-53, to the ISS will also be moved from June 10 to June 17.
"It was previously assumed that the next Progress with food, water, fuel and scientific equipment for the 11th ISS crew would blast off from Baikonur on June 10 on a Soyuz carrier, but this launch will most likely be put off for a week."
Correspondingly, the date for sinking Progress M-52 loaded with trash, the crews' waste, and used equipment is to be adjusted to the launching date of Progress M-53. The undocking operation is now set for June 16.


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