Narrative:

On power up for taxi the jet blast from our engines on the global express moved a non-tied down C172 into an unknown type of aircraft. The minimum power to move our aircraft was used however due to our proximity to the other aircraft and that we were at our maximum takeoff weight our minimum jet blast moved the other airplane.

Google
 

Original NASA ASRS Text

Title: A BBD-700 PLT RPTS THAT DURING TAXI STARTUP ON THE RAMP HIS JET BLAST BLEW A C172 INTO ANOTHER ACFT.

Narrative: ON PWR UP FOR TAXI THE JET BLAST FROM OUR ENGS ON THE GLOBAL EXPRESS MOVED A NON-TIED DOWN C172 INTO AN UNKNOWN TYPE OF ACFT. THE MINIMUM PWR TO MOVE OUR ACFT WAS USED HOWEVER DUE TO OUR PROX TO THE OTHER ACFT AND THAT WE WERE AT OUR MAX TKOF WT OUR MINIMUM JET BLAST MOVED THE OTHER AIRPLANE.

Data retrieved from NASA's ASRS site as of January 2009 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.