two spacecraft undocked at 09:53 UTC. The total docked time was 6 days, 17 hours and 2 minutes. After undocking, Wilmore piloted Atlantis to a point about 450 feet ahead of the station, then, began a flyaround. Once the flyaround was completed, Atlantis performed separation burns to increase the distance between the shuttle and the ISS and left the Space Station complex area at about 10:36 UTC. During a routine flush out of the shuttle waste water tank Wednesday morning, the astronauts ran into a problem. Mission Control noticed a reduction in the flow from the nozzle that vents the waste water into space. The tank can hold 165 pounds of liquid waste and the crew only managed to get it down to about 80 pounds. Later in the day, astronauts used the camera on Orbital Boom Sensor System (OBSS) to survey the condition of the nozzle. Since no ice was found, Flight Controllers told the crew that it is likely that there is a blockage in the line. Standard late inspections of the Thermal Protection System took place later on Flight Day 10. About 12:15 UTC, Wilmore and Melvin began grappling and unberthing the OBSS for the survey of the shuttle's heat shield. With help from Bresnik, they inspected the reinforced carbon-carbon of the right wing leading edge, then the nose cap and the left wing leading edge. The inspection tasks took more than five hours. November 26 (Flight Day 11 – End of mission preparation) The crew was awakened at 06:28 UTC for their final full day in space. STS-129 was the eighth shuttle mission in history to mark the U.S. Thanksgiving holiday up in space and the second time for Atlantis. The first time for Atlantis was during STS-61-B mission in 1985. "The first big news of the day is that our TPS, the Thermal Protection System has been cleared for entry" said STS-129 Entry Flight Director Bryan Lunney early in the day's Mission Status Briefing. Later, he also mentioned that "Atlantis is in great shape, the crew is in great shape ready for de-orbit tomorrow". The crew spent time stowing items in the shuttle's cabin in preparation for the return to Earth. Cabin stowage started at 08:48 UTC.Atlantis crew tested shuttle's re-entry systems. Commander Hobaugh and Pilot Wilmore, with help from Mission Specialist Bresnik checked out the Flight Control System (FCS). Immediately afterwards, at 10:58 UTC,