DHC8-200 LNDG GEAR WOULD NOT RETRACT AFTER TKOF WHEN MAINT LEFT 'LNDG GEAR ALTERNATE RELEASE DOOR' OPEN AFTER SVCING HYD FLUID. THIS DOOR IS A ONCE A DAY CHKLIST ITEM FOR THE FLC.

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AFTER TKOF; THE LNDG GEAR WAS UNABLE TO BE RETRACTED. THE CREW RETURNED THE ACFT TO THE ARPT OF DEP. UPON ARR; IT WAS DISCOVERED BY MAINT PERSONNEL THAT THE 'LNDG GEAR ALTERNATE RELEASE' DOOR HAD BEEN LEFT OPEN BY A MECH WHO HAD SVCED THE ACFT'S HYD SYS IMMEDIATELY PRIOR TO DEP. MY AIRLINE'S CHKLISTS DID NOT CALL FOR THIS ITEM TO BE CHKED PRIOR TO EVERY DEP; ONLY THE FIRST FLT OF THE DAY (OF WHICH THIS WAS NOT). OF GREATER CONCERN TO ME IS THAT THERE WAS NO CHKLIST IN THE ACFT OR COMPANY PUBS THAT ADDRESSED A 'LNDG GEAR CANNOT BE RETRACTED' SCENARIO. HAD THERE BEEN ONE; THE PROB MAY HAVE BEEN EASILY RECTIFIED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR SAID THAT THERE WAS NO CHKLIST FOR THIS PROB AND THAT IT IS BEING ADDRESSED BY THE COMPANY AND TRAINING COMMITTEE SINCE IT HAS OCCURRED SEVERAL TIMES AT THIS AIRLINE. SHE RPTS THAT THE PANEL AND DOOR IN QUESTION IS ABOVE AND BEHIND THE FO'S HEAD; OUT OF THE USUAL LINE OF SCAN OF THE COCKPIT. OPENING OF THE DOOR DEACTIVATES THE HYD PWR TO THE GEAR AND THIS IS DONE TO OPEN THE GEAR DOORS BY MAINT FOR SVCING. THE COMPANY HAS PUT OUT A BULLETIN TO RUN THE ACCEPTANCE OF THE ACFT CHKLIST ANY TIME MAINT HAS WORKED ON THE ACFT.