MLG FLC DEP ORD IGNORES RADIO PROBLEMS ON THE GND; DEPARTS WITHOUT RTE CLRNC; LOSES XMIT CAPABILITY WHEN AIRBORNE; AND FAILS TO SWITCH TO DEP CTL FREQ AFTER TKOF. POTENTIAL CONFLICT WITH OTHER ACR WHEN RPTR CTLR IS TRYING TO ESTABLISH CONTACT WITH MLG.

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ACR X DEPARTED O'HARE ON A 140 DEG ASSIGNED HDG. ACR X DID NOT CHK IN ON DEP CTL. I ATTEMPTED; SEVERAL TIMES; TO TURN ACR X AROUND AN AIRSPACE BOUNDARY BUT GOT NO RESPONSE. I CHKED WITH THE TWR CTLR. THE CTR SECTOR AND ANOTHER DEP CTLR TO SEE IF THEY WERE TALKING TO ACR X. NO ONE HAD THE ACFT HOWEVER W DEP HAD BEEN GETTING A CARRIER WITH NO MODULATION SEVERAL TIMES AND SO HE XMITTED IN THE BLIND FOR ACR X TO CONTACT DEP ON THE APPROPRIATE FREQ (WHICH IS PUBLISHED ON THE ONLY SID O'HARE HAS). I; THEN; RECEIVED A CARRIER WITH NO MODULATION AND ASSUMED IT WAS ACR X SO I XMITTED TO ACR X TO TURN IMMEDIATELY TO 220 DEG BECAUSE THE ACFT WAS GOING HEAD-ON TO ANOTHER ACFT WHICH WAS BEING TURNED OUT OF THE WAY. I THEN SAID 'IF THAT'S ACR X TRYING TO CALL; TRY ANOTHER RADIO BECAUSE THE ONE YOU'RE ON IS NOT WORKING.' I THEN GOT THE FIRST UNDERSTANDABLE CALL FROM ACR X AND IMMEDIATELY ASKED HIM HIS ALT. PLT REPLIES 7500 FT. I THEN ASKED WHAT HE WAS CLBING TO AND HE REPLIED 10000. WHEN I ASKED WHERE HE GOT 10000 FROM HE SAID HE GOT IT FROM THE TWR. AFTER REVIEWING THE TAPES; ACR X DID NOT EVER CONTACT CLRNC DELIVERY AS REQUIRED. ACR X WAS TOLD BY GND CTL AND LCL CTL THAT HE HAD RADIO PROBLEMS AND TO TRY ANOTHER RADIO. ACR X DID NOT USE HIS CALL SIGN WHEN ACCEPTING HIS TKOF CLRNC AND THEN WENT TO THE WRONG PUBLISHED FREQ FOR DEP. THE ORD 9 DEP ASSIGNS 5000 FT TO ALL DEPS AND ACR X CLBED TO 10000 FT WITHOUT CHKING IN WITH DEP CTL. THE APCH CTLR TOOK EVASIVE ACTION TO AVOID A CONFLICT WITH ACR X SO SEPARATION WAS NOT LOST. THE CREW OF ACR X DISPLAYED A VERY UNPROFESSIONAL AND UNSAFE ATTITUDE NOT TO MENTION VIOLATING SEVERAL FAR'S. A PLTDEV RPT WAS FILED.