Expedition 4 was the fourth expedition to the International Space Station.

Crew

• Yury Onufrienko (2), Commander - Russia
• Daniel W. Bursch (5), Flight Engineer - U.S.A.
• Carl E. Walz (4), Flight Engineer - U.S.A.

(1) number of spaceflights each crew member has completed, including this mission.

Mission parameters

• Perigee: 384 km
• Apogee: 396 km
• Inclination: 51.6°
• Period: 92 min

• Docked: STS-108; December 7, 2001, 20:03:29 UTC
• Undocked: STS-111; June 15, 2002, 14:32 UTC
• Time Docked: 189 days, 18 h, 28 min, 31 s

Mission objectives

The International Space Station expanded its science investigations, almost doubling the previous amount of experiments performed during the Expedition Four mission. The fourth resident crew launched on December 5, 2001 onboard Space Shuttle Endeavour during mission STS-108. They became official station residents at 4:11 p.m. CST on December 8, 2001, and remained onboard until June, 2002, when they landed on STS-111 . Expedition 4 crew members Bursch and Walz hold the single spaceflight endurance record of 196 days in orbit.

An international crew of three were the fourth crew to live aboard the International Space Station. The team was led by Russian Yuri I. Onufrienko and joined by American crewmates Daniel W. Bursch and Carl E. Walz, both flight engineers. As a part of the STS-108 mission, Endeavour delivered the Expedition 4 crew to the station. They returned to Earth June 19, 2002, aboard Space Shuttle Endeavour following the STS-111 mission.

Spacewalks

The Expedition Four crew has conducted three spacewalks during its stay onboard the International Space Station. The crew has spent a total of 17 hours and 49 minutes outside the station. Thirty-four spacewalks -- nine station-based and 25 shuttle-based -- have been conducted at the station for total of 208 hours and 5 minutes.

Learn more about the spacewalks required to build the International Space Station.

EVA Cosmonauts and Astronauts and Suit ID Yury Onufrienko: red stripes (Spacewalk 1), blue stripes (Spacewalk 2) Carl Walz: blue stripes (Spacewalk 1), red stripes (Spacewalk 3) Daniel Bursch: blue stripes (Spacewalk 2), solid white suit (Spacewalk 3)

Spacewalk 1

Yury Onufrienko, Carl Walz
Actual time: 6 hours, 3 minutes
Start time: 2:59 p.m. CST (2059 GMT) Jan. 14, 2002
End time: 9:02 p.m. CST Jan. 14, 2002 (0302 GMT Jan. 15, 2002)

Onufrienko and Walz relocated the cargo boom for the Russian Strela crane. They moved the boom from Pressurized Mating Adapter 1 to the exterior of the Pirs Docking Compartment. The crew also installed an amateur radio antenna onto the end of the Zvezda Service Module. The space walk was based out of Pirs and used Russian Orlan spacesuits.

Animated videos show the locations of equipment moved during the spacewalk.

Spacewalk 2

Yury Onufrienko, Daniel Bursch
Time: 5 hours, 59 minutes
Start time: 9:19 a.m. CST (1519 GMT) Jan. 25, 2002
End time: 3:18 p.m. CST (2118 GMT) Jan. 25, 2002

During Expedition Four's second spacewalk, Onufrienko and Bursch installed six deflector shields for the Zvezda Service Module's jet thrusters. Also, they installed an amateur radio antenna, attached four science experiments, and retrieved and replaced a device to measure material from the thrusters. Like the first EVA, this one was based out of Pirs, and the spacewalkers used Orlan suits.

Spacewalk 3

Carl Walz, Daniel Bursch
Time: 5 hours, 49 minutes
Start time: 5:38 a.m. CST (1138 GMT) Feb. 20
End time: 11:25 a.m. CST (1725 GMT) Feb. 20

This spacewalk was based out of the Quest Airlock, using U.S. spacesuits. Walz and Bursch tested the airlock and prepared for the four spacewalks that will be performed during STS-110 in April. The STS-110 crew will install the S0 Truss onto the station. This spacewalk was the first spacewalk to be based out of Quest without a space shuttle at the station.