conference it was suggested that a tether got snagged and caused the camera release button to break off allowing the camera to fall out of its holder. Images were lost but it was determined there was no need to retake them. Curbeam later said to the MCC: "We've got the bracket and the tether. Looks like the screws [on the bracket] came loose, we have the screws and the bracket and the tether." December 17 (Flight day 9) Flight day 9 was mainly spent preparing for EVA #4. The space suits were prepared (adjusting sizes and replacing LiOH canisters) and the crew went through the new procedures which had been developed for attempting to enable the solar array retraction. Various tools were coated in kapton tape to protect the array from coming into direct contact with sharp metallic objects and to provide electrical insulation if they are used to manipulate the arrays during the EVA.Pre-EVA4 press briefing December 18 (Flight day 10 – EVA #4) Flight day 10 began for the astronauts at 14:17 UTC. Bob Curbeam and Christer Fuglesang embarked on an added EVA at 17:12 UTC to try to fully close the last eleven bays of the balky P6-port Solar Array Wing. The rapidly planned EVA was successfully completed after a 6-hour 38-minute spacewalk. At the end of EVA No. 4, Curbeam ranked fifth in total EVA time for U.S. astronauts and 14th overall. December 19 (Flight day 11 – Undocking) Flight day 11 began for the astronauts at approximately 14:47 UTC. The Expedition 14 and STS-116 crews posed for photos and then closed the hatches between the ISS and Discovery. Undocking was complete at 22:10 UTC. Due to the extended mission for EVA No. 4, Discovery did not make a full circle to film and photograph ISS, but only flew slightly more than one-quarter of the way around (through ISS zenith) before its departure burn. December 20 (Flight day 12) Flight day 12 began for the astronauts at 12:48 UTC. They spent the day verifying the integrity of Discovery's heat shield and preparing for deorbit and landing on December 22, 2006 (Flight day 14). Because of the extended spaceflight, the shuttle was required to make a landing attempt on flight day 14 unless all three landing sites were "no-go." Two satellites were also launched: MEPSI (Microelectromechanical System-Based PICOSAT Inspector) resembles a pair of tethered coffee-cups, and is