A FOKKER 100 RETURNED TO THE FIELD IMMEDIATELY AFTER TKOF DUE TO UNABLE TO RETRACT THE LNDG GEAR CAUSED BY IMPROPER LNDG GEAR DOOR REMOVAL PROCS.

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THE ACFT HAD 3 'OPEN ITEMS' TO ADDRESS. THIS ONE WAS A CRACK IN THE R MAIN LNDG GEAR DOOR. IT WAS REMOVED PER AN ENGINEERING AUTH CONFIGN DEV LIST (CDL) AND CALLED FOR THE DOOR SEQUENCE VALVE TO BE SECURED IN THE 'DOOR OPEN' POS. THE ENGINEERING AUTH DID NOT INCLUDE A PICTURE OR DESCRIPTION OF HOW TO ACCOMPLISH THIS. THERE WAS NO MAINT MANUAL REF; AND THE MAINT MANUAL HAS NOTHING DESCRIBING HOW TO ACCOMPLISH THIS PROC (THAT COULD BE FOUND). WITHOUT DOCUMENTATION SHOWING HOW TO SECURE THE VALVE WITH THE DOOR OFF; I WAS LEFT TO INTERPRET THE SIT BEST I COULD. THE USUAL PRESSURE TO RETURN AN ACFT TO SVC AND; AT THE BEGINNING OF THE SHIFT A MAINT MGR MADE A SPEECH (TO ONLY 1 OF 7 CREWS AT WORK ON THE 'LINE') INDICATING 'A SERIOUS INCREASE IN PRODUCTION WAS FORTHCOMING OR CORRECTIVE ACTION BY MGMNT WOULD BE TAKEN.' (MY WORDS) THERE WAS ALSO SPECIFIC VERBAL PRESSURE TO GET THIS ACFT READY ASAP (REITERATED BECAUSE WE MOVED UP THE ESTIMATED TIME OF REPAIR); EVEN THOUGH THERE WERE 12 MORE ACFT IN VARIOUS STATES OF REPAIR. I'M NOT IMPLYING THESE FACTORS WERE RESPONSIBLE FOR MY DECISION TO SECURE THE VALVE IN THE 'DOOR UP' POS INSTEAD OF 'DOOR OPEN.' BUT HUMAN FACTORS BEING WHAT THEY ARE; ONE ISN'T ALWAYS COGNIZANT OF ALL THE INFLUENCES IN MAKING SOME DECISIONS.