Narrative:

Had a one hour banner flight. Upon return I was instructed to do a low pass of 250 ft over the banner box field following company operating procedures so a picture could be taken. Once I reached my altitude of 250 ft I put in full power to begin my climb but experienced wind shear [and] the plane [was] unable to climb or gain airspeed. My banner detached hitting another parked airplane causing minor damage to its right wing.

Google
 

Original NASA ASRS Text

Title: Banner tow pilot reported encountering wind shear that limited the climb capability; causing the banner to detach and hit a parked aircraft.

Narrative: Had a one hour banner flight. Upon return I was instructed to do a low pass of 250 ft over the banner box field following company operating procedures so a picture could be taken. Once I reached my altitude of 250 ft I put in full power to begin my climb but experienced wind shear [and] the plane [was] unable to climb or gain airspeed. My banner detached hitting another parked airplane causing minor damage to its right wing.

Data retrieved from NASA's ASRS site 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.