Spaceflight Now: STS-101 Mission Report
Photo Gallery: Tricky repair at launch pad 39A
Posted: April 14, 2000

Workers preformed an unprecedented repair job on space shuttle Atlantis, replacing a balky 300-pound hydraulic unit in the spaceship's tail while the winged-orbiter stood on its exposed seaside launch pad. Photos: NASA/KSC.

New box
The new Power Drive Unit (PDU) is attached to a crane at launch pad 39A.
PDU on crane
Going up
The new PDU, wrapped to protect it from the drizzlying rain, is hoisted up toward Atlantis' tail area. Perched more than 100 feet above the flame trench, workers in a "cherry picker" aerial platform, prepare to manoeuvre the PDU into position.
PDU hoisted
Into place
The PDU, about the size of an office copier, is eased into place at the base of Atlantis' tail.
Into place
Job done
With the complex repair job done, the gantry-like rotating service structure is rolled back in place around the shuttle.
RSS rolls back
Flight data file
Vehicle: Atlantis (OV-104)
Payload: ISS 2A.2a
Launch date: April 24, 2000
Launch window: 2012-2022 GMT (4:12-4:22 p.m. EDT)
Launch site: LC-39A, Kennedy Space Center, Fla.
Landing date: May 4, 2000
Landing time: 1523 GMT (11:23 a.m. EDT)
Landing site: SLF, KSC
Crew: Halsell, Horowitz, Weber, Williams, Voss, Helms, Usachev

Video vault
Workers remove the faulty Power Drive Unit from space shuttle Atlantis using a heavy-lift crane at launch pad 39A.
  PLAY (299k, 299k QuickTime file)
A replacement Power Drive Unit is installed inside space shuttle Atlantis' tail at launch pad 39A on April 12.
  PLAY (304k, 35sec QuickTime file)
Shuttle technicians oversee the freezing of hydraulic lines leading to Atlantis' broken Power Drive Unit on April 12.
  PLAY (374k, 29sec QuickTime file)
Download QuickTime 4 software to view this file.

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