Narrative:

Entered class B airspace (msp) by mistake. Mistook msp airport for fcm. Entered class B airspace for at least 1 mi. Took corrective actions to leave class B airspace when realized. DME equipment inoperative. Will use flight following and GPS navigation to prevent a recurrence.

Google
 

Original NASA ASRS Text

Title: PLT ENTERS MSP CLASS B AIRSPACE WITHOUT CLRNC.

Narrative: ENTERED CLASS B AIRSPACE (MSP) BY MISTAKE. MISTOOK MSP ARPT FOR FCM. ENTERED CLASS B AIRSPACE FOR AT LEAST 1 MI. TOOK CORRECTIVE ACTIONS TO LEAVE CLASS B AIRSPACE WHEN REALIZED. DME EQUIP INOP. WILL USE FLT FOLLOWING AND GPS NAV TO PREVENT A RECURRENCE.

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.