My question involves a background check in the State of: PA

About 5 months ago me and a friend were pulled over and the cop found 1/2 pound of marijuana and bags but not the scale. When it went to court they got me with 99Grams. what lead to Attempt to sell, Conspiracy and 1 other felony. At the time i was only 17 and was charged as a juvenile never convicted i had 64 hour C.S. and 3 years probation with expungment but my lawyer got my 1 year and i can go back into court as long as nothing happens from july 08 till july of 09. Im now 18 work part time at UPS and go to college for sheet metal i was looking to get into Boeing the job says "No Security Clearance Required" will this come up if they do a backround check? Thanks