Narrative:

Just left paint shop. Descending from 7000 ft to 4000 ft; loud bang and continuous pounding bottom of airplane. Airplane slowed and emergency declared with center. Another baron viewed plane and saw left wing root seal loose and hitting bottom of plane. Continued to fly where baron service available. Would have landed sooner if had not known what the problem was.

Google
 

Original NASA ASRS Text

Title: BE58 HAS WING ROOT FAIRING PANEL COME LOOSE INFLT BANGING AGAINST SKIN. DIVERT FOR MAINT.

Narrative: JUST LEFT PAINT SHOP. DSNDING FROM 7000 FT TO 4000 FT; LOUD BANG AND CONTINUOUS POUNDING BOTTOM OF AIRPLANE. AIRPLANE SLOWED AND EMER DECLARED WITH CENTER. ANOTHER BARON VIEWED PLANE AND SAW L WING ROOT SEAL LOOSE AND HITTING BOTTOM OF PLANE. CONTINUED TO FLY WHERE BARON SVC AVAILABLE. WOULD HAVE LANDED SOONER IF HAD NOT KNOWN WHAT THE PROB WAS.

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.