Narrative:

We were ready for gate departure at mia, with before starting engines checklist completed. Agent was closing the door when a mechanic showed up to re-accomplish a placarded item involving a pack pressure gauge. As part of the placarding procedure, the mechanic advanced the left throttle and proceed to check a couple of associated components. After completing the procedure, the throttle was not returned to idle prior to start. Following start, power exceeded normal taxi limits and caused minor damage behind aircraft. In retrospect, we should have run the checklist over to catch the throttle.

Related reports:

Google
 

Original NASA ASRS Text

Title: MD80S ACFT AT GATE. FLC HAD COMPLETED BEFORE START CHKLIST WHEN A LAST MIN MAINT CHK WAS PERFORMED BY A MECH WHO LEFT THE THROTTLE ADVANCED. WHEN THE ENG WAS STARTED EXCESSIVE JET BLAST CAUSED SOME DAMAGE BEHIND THE ACFT.

Narrative: WE WERE READY FOR GATE DEP AT MIA, WITH BEFORE STARTING ENGS CHKLIST COMPLETED. AGENT WAS CLOSING THE DOOR WHEN A MECH SHOWED UP TO RE-ACCOMPLISH A PLACARDED ITEM INVOLVING A PACK PRESSURE GAUGE. AS PART OF THE PLACARDING PROC, THE MECH ADVANCED THE L THROTTLE AND PROCEED TO CHK A COUPLE OF ASSOCIATED COMPONENTS. AFTER COMPLETING THE PROC, THE THROTTLE WAS NOT RETURNED TO IDLE PRIOR TO START. FOLLOWING START, PWR EXCEEDED NORMAL TAXI LIMITS AND CAUSED MINOR DAMAGE BEHIND ACFT. IN RETROSPECT, WE SHOULD HAVE RUN THE CHKLIST OVER TO CATCH THE THROTTLE.

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.