Narrative:

(Departure phase). ATC was giving us departure vectors and determined we were on course for head-on conflict. ATC told 'columbia' to climb but he used our tail number; so I assumed he was telling me to climb. I climbed to 6;000 ft MSL; ATC called back and told me to return to 5;500 ft MSL.

Google
 

Original NASA ASRS Text

Title: NMAC occurs when ATC mixed call signs and gave climb clearance to the wrong aircraft.

Narrative: (Departure phase). ATC was giving us departure vectors and determined we were on course for head-on conflict. ATC told 'Columbia' to climb but he used OUR tail number; so I assumed he was telling me to climb. I climbed to 6;000 FT MSL; ATC called back and told me to return to 5;500 FT MSL.

Data retrieved from NASA's ASRS site as of April 2012 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.