Narrative:

After servicing the #2 engine on aircraft, I tried to install the cap onto the tank, but the oil servicing hose was in the way. I removed the hose and wrapped it up. While doing this, I noticed that the #2 engine cowl did not have a CSD access door or viewing holes to check CSD oil level. I started thinking about opening the engine cowl and closed the engine oil access door without making sure the oil cap was secure. It was discovered at its next destination after departing ZZZ. While I have never taken my job for granted, I have to make sure I've completed the task at hand (physically) before moving onto the next task.

Google
 

Original NASA ASRS Text

Title: A B727-200 WAS DISPATCHED IN NON COMPLIANCE WITH #2 ENG OIL CAP NOT SECURED. TECHNICIAN DISTR BY MISSING CSD OIL SVC DOOR.

Narrative: AFTER SVCING THE #2 ENG ON ACFT, I TRIED TO INSTALL THE CAP ONTO THE TANK, BUT THE OIL SVCING HOSE WAS IN THE WAY. I REMOVED THE HOSE AND WRAPPED IT UP. WHILE DOING THIS, I NOTICED THAT THE #2 ENG COWL DID NOT HAVE A CSD ACCESS DOOR OR VIEWING HOLES TO CHK CSD OIL LEVEL. I STARTED THINKING ABOUT OPENING THE ENG COWL AND CLOSED THE ENG OIL ACCESS DOOR WITHOUT MAKING SURE THE OIL CAP WAS SECURE. IT WAS DISCOVERED AT ITS NEXT DEST AFTER DEPARTING ZZZ. WHILE I HAVE NEVER TAKEN MY JOB FOR GRANTED, I HAVE TO MAKE SURE I'VE COMPLETED THE TASK AT HAND (PHYSICALLY) BEFORE MOVING ONTO THE NEXT TASK.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.