ment ▁was ▁divided ▁into ▁four ▁ 9 0 - deg ree ▁segments ▁that ▁contained ▁Earth ▁landing ▁equipment ▁( all ▁the ▁par ach utes , ▁recovery ▁anten nas ▁and ▁be acon ▁light , ▁and ▁sea ▁recovery ▁s ling ), ▁two ▁reaction ▁control ▁engines , ▁and ▁the ▁forward ▁heat ▁shield ▁release ▁mechanism . ▁▁ ▁At ▁about ▁ ▁during ▁re entry , ▁the ▁forward ▁heat ▁shield ▁was ▁j ett ison ed ▁to ▁expose ▁the ▁Earth ▁landing ▁equipment ▁and ▁permit ▁deployment ▁of ▁the ▁par ach utes . ▁ ▁A ft ▁compart ment ▁The ▁a ft ▁compart ment ▁was ▁located ▁around ▁the ▁peri ph ery ▁of ▁the ▁command ▁module ▁at ▁its ▁wid est ▁part , ▁just ▁forward ▁of ▁( above ) ▁the ▁a ft ▁heat ▁shield . ▁The ▁compart ment ▁was ▁divided ▁into ▁ 2 4 ▁b ays ▁containing ▁ 1 0 ▁reaction ▁control ▁engines ; ▁the ▁fuel , ▁ox id izer , ▁and ▁hel ium ▁t anks ▁for ▁the ▁C M ▁reaction ▁control ▁sub system ; ▁water ▁t anks ; ▁the ▁cr ush able ▁rib s ▁of ▁the ▁impact ▁at ten u ation ▁system ; ▁and ▁a ▁number ▁of ▁instruments . ▁The ▁C M - SM ▁um bil ical , ▁the ▁point ▁where ▁w iring ▁and ▁pl umb ing ▁ran ▁from ▁one ▁module ▁to ▁the ▁other , ▁was ▁also ▁in ▁the ▁a ft ▁compart ment . ▁The ▁pan els ▁of ▁the ▁heat ▁shield ▁covering ▁the ▁a ft ▁compart ment ▁were ▁remov able ▁for ▁maintenance ▁of ▁the ▁equipment ▁before ▁flight . ▁ ▁Earth ▁landing ▁system ▁ ▁The ▁components