 Quest Joint Airlock Module. Crew lock with EVA hatch on right, and equipment lock with three attached gas tanks on left | |
| Module statistics | |
|---|---|
| Part of | International Space Station |
| Launch date | July 12, 2001, 09:04 UTC |
| Launch vehicle | Space Shuttle Atlantis |
| Berthed | July 15, 2001, 07:40 UTC[1] (Unity starboard) |
| Mass | 6,064 kg (13,369 lb) |
| Length | 5.5 m (18 ft) |
| Diameter | 4 m (13 ft) |
| Pressurizedvolume | 34 m3 (1,200 cu ft) |
TheQuest Joint Airlock is the primaryairlock for theInternational Space Station.Quest was designed to hostspacewalks with bothExtravehicular Mobility Unit (EMU)spacesuits andOrlan space suits. The airlock was launched onSTS-104 on July 14, 2001.
It was attached to the starboardCBM of theUnity duringSTS-104. The four external HP tanks were installed in pairs on two occasions.
BeforeQuest was attached,Russian spacewalks using Orlan suits could only be done from theZvezda service module, andAmerican spacewalks using EMUs were only possible when aSpace Shuttle was docked, allowing the astronauts to use the Shuttle's airlock, located in its payload bay.[citation needed] The arrival ofPirs docking compartment on September 16, 2001, provided another airlock from which Orlan spacewalks can be conducted.[citation needed]
Quest was necessary because American suits (EMUs) will not fit through a Russian airlock hatch and have different components, fittings, and connections. The airlock is designed to contain equipment that can work with both types of spacesuits, however, it is currently only able to host American spacewalks because the equipment necessary to work with Russian space suits has not been launched yet, which required theExpedition 9 crew to take a circuitous route to a worksite because of problems with the American space suits.[2]
It is sized to allowEVAs with two crew.
EMU EVAs were conducted from the ISS Joint Airlock in July 2001, February 2002, April 2002, and June 2002.[3]
TheQuest Airlock consists of two segments, the "Equipment lock" that stores spacesuits and equipment, and the "Crew Lock" from which astronauts can exit into space.[4] It was derived from theSpace Shuttle airlock, although it was significantly modified to waste less atmospheric gas when used.[clarification needed][citation needed] It has mountings for four high-pressure gas tanks, two containingoxygen and two containingnitrogen, which provides for atmospheric replenishment to the American side of the space station, most specifically for the gas lost after a hatch opening during a space walk.
The larger equipment lock has storage space for EMU suits and equipment to check and maintain the EMUs.
There is a Battery Charging Assembly, a Battery Stowage Assembly, a Fluid Pumping Unit (FPU) (to refill the EMU water tanks after each EVA), and much else.[3]
The hatch to space (EV hatch) has an inward opening airtight hard hatch, and an outwardly hinged thermal cover.[3][5] The inner airtight hatch gets stowed at the end of the crew lock to allow ingress and egress.[citation needed]
In the crew lock is the Umbilical Interface Assembly, able to support two US suits, or two Orlan-M suits, or one of each.[3]
_Christina_Koch_exits_the_Quest_airlock.jpg)
Quest provides an environment where astronauts can "camp out" before a spacewalk in a reduced-nitrogen atmosphere to purge nitrogen from their bloodstream and avoiddecompression sickness in the low-pressure (4.3 psi, 30 kPa) pure-oxygen atmosphere of the spacesuit.[6] In April 2006,Expedition 12 CommanderBill McArthur andExpedition 13 flight engineerJeffrey Williams tested this new method of preparing for spacewalks by spending the night in theQuest Airlock.[7] In the chamber, the pressure was reduced from the normal 14.7 to 10.2 psi (101 to 70 kPa).[6] Four hours into the Expedition 13 crew's sleep period, an error tone prompted mission controllers to cut short the activity, but the test was still deemed a success. American spacewalk activities thereafter have employed the "camp-out" pre-breathing technique.[6][7][8]The previous method of preparing for spacewalks involved breathing pure oxygen for several hours prior to an EVA to purge the body of nitrogen.
More recently[when?] astronauts have been using the In-Suit Light Exercise protocol rather than camp-out to prevent decompression sickness.[9][10]
Two oxygen and two nitrogen high-pressure gas tanks are attached externally to the equipment lock segment. These tanks (known as the High Pressure Gas Assembly.[11]) provide a replenishable source of gas to the atmosphere control and supply system and 900 psi (6.2 MPa) oxygen for recharging the space suits (EMUs).[citation needed]
Recharging the high-pressure tanks was accomplished by the Space Shuttle fleet until its retirement. When an orbiter was docked to the station's Pressurized Mating Adapters (PMA-2 or PMA-3), oxygen was routed through pressure lines from the PMAs to theQuest Airlock. The pumping of the oxygen from the docked spacecraft tanks intoQuest's high-pressure tank was accomplished by the Oxygen Recharge Compressor Assembly (ORCA).[12]
After the retirement of the Space Shuttle fleet, the Nitrogen Oxygen Recharge System (NORS) and spacecraft from theCommercial Crew Development program will take over this task.[13]
This module wasmanufactured byBoeing, under contract by NASA, at the Marshall Space Flight Center[11] in 2000. It is made from aluminum and steel alloys.[citation needed]
The design for the crew airlock segment was derived from that of theSpace Shuttle's external airlock.[11]
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