As well as preparing the Lunar Module for its descent, the crew continued observations of the Moon (including of the landing site at Hadley) and provided television footage of the surface. Then, Scott and Irwin entered the Lunar Module in preparation for the landing attempt. Undocking was planned for 100:13:56, over the far side of the Moon, but nothing happened when separation was attempted. After analyzing the problem, the crew and Houston decided the probe instrumentation umbilical was likely loose or disconnected; Worden went into the tunnel connecting the command and lunar modules and determined this was so, seating it more firmly. With the problem resolved, Falcon separated from Endeavour at 100:39:16.2, about 25 minutes late, at an altitude of . Worden in Endeavour executed a SPS burn at 101:38:58.98 to send Endeavour to an orbit of by in preparation for his scientific work.
As welL as pREparING thE Lunar module for iTs DeScEnt, tHe crEw cOntinUeD oBsErvations of the mooN (InClUdINg of the landing Site aT hadley) ANd prOvIded televiSion FooTaGe Of the surface. then, ScOtt AnD IrWin enTErED tHe luNAr MoDULe In prepAraTion for ThE laNDinG attemPT. undocKIng Was PlanneD for 100:13:56, over The far side of thE Moon, but noTHinG haPpened WhEn SEparaTIOn Was AtTemPted. aFTer aNAlyZINg the probLem, the cReW and houStON deciDeD the proBE instrumeNtaTion uMbIlIcal waS likely Loose oR DisCOnnEcted; worDEn weNt intO The tuNnel cOnnectiNg the cOMmand aND lUNaR moDules anD dEteRMined tHis was so, sEaTinG It MOre fiRmly. wiTh the Problem rEsolved, FAlcOn sEParAted FRom endeAVour at 100:39:16.2, aBout 25 minUtes lAte, at an aLtituDe Of . WorDeN In eNdEavoUr executed a sPs BuRn at 101:38:58.98 to sEnD EndeaVOur to an oRbIt of by in preparAtion for his scientiFIc Work.