B727-200. WHILE BEING GUIDED IN TO A GATE; THE GUIDEMAN USED NONSTANDARD PARKING PROCS INCURRING JETBLAST DAMAGE TO A TRUCK AND A PARKED ATR72.

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AFTER A NORMAL LNDG AND TAXI S TOWARD THE N END OF THE SCHEDULED SVC RAMP AREA (LNDG RWY 34) AND AFTER SHUTTING DOWN ENG #3 AS PER COMPANY PROTOCOL; I TAXIED TOWARD A SINGLE MARSHALLER AS ADVISED BY PRIOR RADIO CONTACT. AT FIRST SIGHT THE MARSHALLER WAS STANDING AND SLOWLY WAVED ME IN AS IF HE WAS GOING TO PARK THE AIRPLANE AT A 45 DEG HDG AWAY FROM THE RWY AND AWAY FROM THE PARALLEL TXWY (WE WERE NOW FACING ROUGHLY NE) AND STRAIGHT AHEAD. AFTER SLOWLY THE AIRPLANE TO A NEAR CRAWL AND ANTICIPATING THIS STRAIGHT AHEAD STOP THE MARSHALLER BEGAN TO LEAD ME IN A COUNTERCLOCKWISE TURN TOWARD THE RWY; UPHILL; INTO THE WIND AND THUS WAS LEADING US SLOWLY TOWARD THE SW. I FOLLOWED HIS INSTRUCTIONS PRECISELY; STOPPED THE AIRPLANE EXACTLY WHERE INDICATED AND FOLLOWED COMPANY PROCS FOR SHUTDOWN. AFTER STOPPING THE AIRPLANE; THE MARSHALLER HAD A LOOK OF DISMAY AND AFTER LOOKING TO THE L AND REAR OF THE AIRPLANE I COULD SEE WHY. APPARENTLY; THE FORCE FROM THIS ULTRA SLOW TURN AND THE #1 AND #2 ENGS HAD TOPPLED A PORTABLE AIRSTAIR (MOUNTED ON A FORD PICKUP TRUCK) AND HAD ROTATED AN ATR72 SOME 30 FT AWAY FROM THE JETBLAST. I SPOKE ALSO TO THE AIRSTAIR DRIVER WHO WAS UNINJURED AND HE ADMITTED HE HAD PARKED TOO CLOSE AS WELL. LIKEWISE; IF I HAD BEEN LED IN A CLOCKWISE MANNER; THE JETBLAST WOULD HAVE COMPLETED MISSED THE AIRSTAIR AND THE ATR72. THE TRUCK WAS LATER SET UPRIGHT AND DRIVEN AWAY WITH SEEMINGLY MINOR DAMAGE. THE ATR HAD TO BE FERRIED FOR REPAIR OF A PANEL ON THE TAIL.