To land the SHERIDAN the quickest way before the asteroids hit
your ship, go down the stairs to the M.O.M. console and look at
the VIDEO CD. Next to the VIDEO CD on the left are two buttons 
saying ON and OFF. Press the ON button, go back up the stairs 
and head right. Open the door marked EXIT using the keypad and
then turn right again. Open the last barrack door to the right
and search the desk and cabinet for a PASS and RAW CD. Leave 
the room and go back to the M.O.M. console. Using the PASS on
M.O.M.'s screen, select the topic SHIP STATUS, then the topic
SENSORS and then M.O.M. will ask you to use the RAW CD in the
VIDEO CD. Do it and then leave the M.O.M. console and go to the
cockpit area. Talk with WILLIAMS and he will land the SHERIDAN 
automatically.