RPTR CONFESSES INADVERTENTLY UTILIZING IMPROPER DEFERRAL PROCS.

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THE PLT OF A DASH 8-102 ACFT WROTE UP THE APU VENT DOOR STUCK OPEN. I WENT TO THE ACFT AND DISCOVERED THE VENT DOOR DAMPENER AT FAULT. IT WAS DETERMINED THAT WE HAD ZERO IN STOCK. AFTER CONSULTING WITH MAINT CTL; AND MY SUPVR; IT WAS THOUGHT THIS VENT DOOR (LOCATED ON THE AFT FUSELAGE BELLY ACCESS DOOR) WAS ONLY OPENED AND CLOSED WHEN SELECTING THE APU BLEED AIR ON. I CLOSED THE DOOR BY HAND AND VERIFIED IT STAYED CLOSED. I WENT AHEAD AND DEFERRED THE APU BLEED AIR. AFTER MORE DISCUSSION WITH OUR MAINT CTL SUPVR; THE ACFT WAS THEN ALLOWED TO TAXI OUT. IN THE MEANTIME; OUR TECHNICAL REPRESENTATIVE WAS CONSULTED AND IT WAS THEN DISCOVERED THIS DOOR COULD OPEN (ONLY ON THE GND) IF THE HEAT EXCHANGERS REQUIRED MORE COOLING. THE ACFT WAS BROUGHT BACK TO THE GATE NEVER HAVING FLOWN; AND A PART WAS CANNIBALIZED FROM ANOTHER ACFT; THUS; THE DEFERRAL WAS CLRED. THIS ACFT WAS IN A 'QUICK-TURN' STATUS WHICH MAY HAVE AFFECTED EXTENSIVE TROUBLE-SHOOTING TIME. SINCE THEN I HAVE BEEN PROPERLY RECURRENTLY TRAINED ON PROPER DEFERRAL PROCS AND TROUBLE- SHOOTING SYS AND INTERRELATIONSHIPS WITH OTHER SYS. THIS ITEM USED TO BE ON OUR CDL LIST AND IS ON DEHAVILLAND'S MASTER MEL LIST. IT'S BEEN RECENTLY REMOVED FROM OURS.