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Expedition 24

24th expedition to the International Space Station

Field	Value
name	Expedition 24
image	Expedition 24 Matrix crew poster.jpg
image_caption	Promotional Poster
insignia	ISS Expedition 24 Patch.svg
insignia_caption	Expedition 24 mission patch
mission_type	Long-duration expedition
crew_size	6
crew_members	Expedition 23/24:
Aleksandr Skvortsov
Mikhail Korniyenko
Tracy Caldwell Dyson
Expedition 24/25:
Fyodor Yurchikhin
Shannon Walker
Douglas H. Wheelock
crew_photo	Expedition 24 crew portrait.jpg
crew_photo_caption	(l-r) Wheelock, Caldwell Dyson, Skvortsov, Korniyenko, Walker and Yurchikhin
space_station	International Space Station
start_date	UTC
end_date	UTC
arrival_craft	Soyuz TMA-18
Soyuz TMA-19
departure_craft	Soyuz TMA-18
Soyuz TMA-19
previous_mission	Expedition 23
next_mission	Expedition 25
programme	ISS expeditions

Aleksandr Skvortsov Mikhail Korniyenko Tracy Caldwell Dyson

Expedition 24/25: Fyodor Yurchikhin Shannon Walker Douglas H. Wheelock

Soyuz TMA-19 Soyuz TMA-19

Expedition 24 was the 24th long-duration mission to the International Space Station (ISS). Expedition 24 initially had two planned spacewalks, one Russian and one American Extra-vehicular Activity (EVA). The U.S. EVA was re-planned and a second U.S. EVA was added.

Crew

Position	First part
(June 2010)	Second part
(June 2010
to September 2010)	Commander	Flight Engineer 1	Flight Engineer 2	Flight Engineer 3	Flight Engineer 4	Flight Engineer 5
RUS Aleksandr Skvortsov, RSA
First spaceflight
RUS Mikhail Korniyenko, RSA
First spaceflight
USA Tracy Caldwell Dyson, NASA
Second spaceflight
	RUS Fyodor Yurchikhin, RSA
Third spaceflight
	USA Shannon Walker, NASA
First spaceflight
	USA Douglas H. Wheelock, NASA
Second spaceflight

;Source: NASA

Backup crew

Mikhail Tyurin
Aleksandr Samokutyayev
Scott J. Kelly
Andrei Borisenko
Paolo Nespoli
Catherine Coleman

Incidents

Ammonia pump module

On 31 July 2010, the Expedition 24 crew was awoken by an alarm on the station. The alarm was caused by a cooling pump that had failed and caused a Remote Power Controller to trip and cut power to some of the International Space Station (ISS). Astronauts Tracy Caldwell Dyson and Doug Wheelock performed some steps to assist ground controllers in re-powering some of the station components such as two main power buses and one Control Moment Gyroscope. After the steps had been completed Capcomm James Kelly told the crew they could go back to bed as all the work required by the crew on the ISS was complete. A short time later, another alarm sounded and awoke the crew, when the ground attempted to restart the pump module.

Docking ring

A failure in the docking ring on the Mini-Research Module 2 (MRM2) Poisk, caused a delay in the planned landing of the Soyuz TMA-18 spacecraft. Soyuz TMA-18 was originally planned to undock and land on 24 September 2010, but instead undocked less than 24 hours later on 25 September 2010. The failure is believed to be due to a faulty indication from a micro-switch on the hatch between the Soyuz and MRM2. A drive gear, which is related to the docking mechanism was also found to have two broken teeth, and is believed to be related to the problem as well.

Spacewalks

Wheelock egresses the Quest Airlock hatch on the ISS during the EVA 3 on 11 August 2010.

Three spacewalks, one in Orlan space suits and two in U.S. Extravehicular Mobility Units (EMUs) were originally planned for Expedition 24. However, additional spacewalking tasks were added to remove and replace a failed ammonia pump module.

Mission	Spacewalkers	Start (UTC)	End (UTC)	Duration
Expedition 24
EVA 1
‡	Mikhail Korniyenko
Fyodor Yurchikhin	27 July 2010
04:11	27 July 2010
10:53	6 hours 42 minutes
Korniyrnko and Yurchikhin ran three data cables between Rassvet and the Zvezda module, routing them along the Zarya module. The pair then installed cables between Rassvet and Zarya. They next moved on to relocate a camera already on Rassvet's exterior, from the zenith or space-facing side to the nadir or Earth-facing side. As their final task, Yurchikhin and Kornienko replaced a camera used for docking European Automated Transfer Vehicles to the station.
Expedition 24
EVA 2
Douglas Wheelock
Tracy Caldwell Dyson	7 August 2010
11:19	7 August 2010
19:22	8 hours 3 minutes
Wheelock and Caldwell Dyson disconnected electrical and fluid connectors. The spacewalkers did not complete all of the planned tasks due to a quick disconnect that got stuck and would not release. The pair had to complete a "bake-out" in order to ensure there was no ammonia on their suits before re-entering the Space Station.
Expedition 24
EVA 3
Douglas Wheelock
Tracy Caldwell Dyson	11 August 2010
12:27	11 August 2010
19:53	7 hours 26 minutes
Wheelock successfully closed the quick disconnect valve for the fourth and final fluid connector for the failed pump, and detached the final fluid line from the failed pump. Caldwell Dyson demated five electrical and data cables while Wheelock broke torque and removed four bolts from the old pump. The pump was extracted from the truss through the use of a grapple bar and installed on a payload bracket on the Mobile Base System on the station's truss. Caldwell Dyson then prepared the spare pump for future installation, disconnecting three of five electrical cables and reconfiguring insulation.
Expedition 24
EVA 4
Douglas Wheelock
Tracy Caldwell Dyson	16 August 2010
10:20	16 August 2010
17:40	7 hours 20 minutes
Wheelock removed the spare pump module from an external stowage platform. The pump module was successfully installed on the S1 Truss after Wheelock attached four bolts and Caldwell Dyson mated five electrical connectors.

‡ denotes spacewalks performed from the Pirs docking compartment in Russian Orlan suits.

Gallery

Image:TMA-19 Roll Out Expedition 24.jpg|The Soyuz TMA-19 spacecraft is rolled out by train to the launch pad at the Baikonur Cosmodrome, Kazakhstan in preparation for the launch of Expedition 24. Image:Expedition 24 Soyuz TMA-19 Launch.jpg|Soyuz TMA-19 launched on Wednesday, 16 June 2010. File:ISS-24 Crescent moon and the thin line of Earth's atmosphere.jpg|Amazing picture taken over central Asia File:Expedition 23-24 landing.jpg|The Soyuz TMA-18 with its main parachute deployed for landing on 25 September 2010. Image:Soyuz TMA-18 landing site welcome back.jpg|Tracy Caldwell Dyson, Alexander Skvortsov and Mikhail Kornienko sit in chairs outside the Soyuz capsule just minutes after they landed.

References

NASA HQ. (2008). "NASA Assigns Space Station Crews, Updates Expedition Numbering". NASA.
NASA HQ. (2009). "NASA and its International Partners Assign Space Station Crews". NASA.
Bill Harwood. "Spacewalks needed to fix station cooling problem". Spaceflightnow.com.
Chris Bergin. (24 September 2010). "Soyuz TMA-18 home after second undocking attempt success". NASASpaceflight.com.
Chris Bergin. (7 August 2010). "Opening ISS spacewalk to replace coolant pump completed". NASASpaceflight.com.
Chris Gebhardt. (11 August 2010). "Large success for second EVA as failed Pump Module is removed". NASAspaceflight.com.
William Harwood. (11 August 2010). "Station's bad pump removed; more spacewalking ahead". Spaceflight Now.
NASA. (16 August 2010). "Spacewalkers Install Spare Ammonia Pump".

Info: Wikipedia Source

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