FLT TO PROVIDE INSTRUCTION ON HOW TO NAV C90 AREA LEADS TO ENTRY INTO TEMPORARY FLT RESTR AIRSPACE NEAR OBK UNKNOWN TO INSTRUCTOR.

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TRAINING FLT ALONG CHICAGO'S AIRSPACE FROM UES TO GYY. RECEIVED WX INFO FOR FLT BUT DID NOT RECEIVE NOTICE OF TEMPORARY FLT RESTR. WX BRIEFING SHOULD HAVE BEEN OBTAINED BY PLTS. ALSO; I FEEL WAUKEGAN AND MEIGS TWR SHOULD HAVE MADE THE INFO AVAILABLE TO PLTS ENRTE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE INSTRUCTOR SAID THE PURPOSE OF THE FLT WAS TO GIVE STUDENT FAMILIARITY WITH THE PROCS REQUIRED TO AVOID THE CHICAGO CLASS B AIRSPACE ALONG THE SHORE OF LAKE MICHIGAN. IN THE COURSE OF PREFLT AND FLT PLAN FILING; NOTAMS WERE CHKED BY COMPUTER; BUT NOT WITH DIRECT CONTACT WITH AN FSS BRIEFER. INTRUSION INTO THE RESTR AIRSPACE WAS DISCOVERED BY ZAU AND THE CREW WAS NOTIFIED BY MILWAUKEE APCH SINCE THAT WAS THE FREQ THEY WERE MONITORING ON THEIR VFR FLT. A REQUEST FOR A LETTER OF EXPLANATION WAS MADE BY FSDO. RPTR SAID THEY DID NOT CONTACT C90 SINCE THEY WERE BELOW C90 AIRSPACE AND DID NOT WISH TO INTERFERE WITH RADIO TFC WHICH IS TYPICALLY BUSY BECAUSE OF ORD TFC. IN HINDSIGHT; HE SUGGESTS THAT C90 WOULD HAVE BEEN THE ONES TO ADVISE THE CREW OF THE EXISTENCE OF THE TEMPORARY FLT RESTR.