Narrative:

Departed from pwk (VFR) to pick up an IFR flight plan over grr. The assigned runway was runway 16. I departed under pwk tower control and was assigned an approximately 90 degree heading, direct grr. Knowing that this runway faced chicago's O'hare airspace, I attempted to contact chicago departure control immediately after departure on the correct frequency. Chicago responded that if I was VFR they were too busy to talk to me. Shortly thereafter, I received a collision avoidance warning from my system. I responded with evasive action that entailed a climb. I decided to climb since I had just departed and was relatively close to the ground obstructions (approximately 1000 ft AGL). This climb inadvertently placed me into chicago's class B airspace. Shortly after the first collision avoidance warning, I received another and yet another. I responded by climbing and then a climbing turn away from the traffic. Both subsequent climbs put me further into chicago's class B airspace. In my 9 yrs of flying I have never penetrated any airspace without proper clearance. My home base, has kennedy's class B directly above it. Therefore, I am keenly aware of operations in and around class B airspaces. Furthermore, I have flown into pwk dozens of times without incident. I feel I was forced into penetrating class B airspace by a sequence of circumstances beyond my control. The conclusion I have come to is this: if departing VFR from a runway that will face me into an airspace, request a downwind departure that will allow a 180 degree turn away from that upcoming airspace. I would recommend this as an established procedure at pwk.

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Original NASA ASRS Text

Title: DEPARTING VFR ON A VECTOR FROM PWK, IL, A COLLISION AVOIDANCE MANEUVER DIRECTED BY A COLLISION AVOIDANCE SYS RESULTS IN UNAUTH ENTRY INTO OVERLYING CLASS B AIRSPACE.

Narrative: DEPARTED FROM PWK (VFR) TO PICK UP AN IFR FLT PLAN OVER GRR. THE ASSIGNED RWY WAS RWY 16. I DEPARTED UNDER PWK TWR CTL AND WAS ASSIGNED AN APPROX 90 DEG HDG, DIRECT GRR. KNOWING THAT THIS RWY FACED CHICAGO'S O'HARE AIRSPACE, I ATTEMPTED TO CONTACT CHICAGO DEP CTL IMMEDIATELY AFTER DEP ON THE CORRECT FREQ. CHICAGO RESPONDED THAT IF I WAS VFR THEY WERE TOO BUSY TO TALK TO ME. SHORTLY THEREAFTER, I RECEIVED A COLLISION AVOIDANCE WARNING FROM MY SYS. I RESPONDED WITH EVASIVE ACTION THAT ENTAILED A CLB. I DECIDED TO CLB SINCE I HAD JUST DEPARTED AND WAS RELATIVELY CLOSE TO THE GND OBSTRUCTIONS (APPROX 1000 FT AGL). THIS CLB INADVERTENTLY PLACED ME INTO CHICAGO'S CLASS B AIRSPACE. SHORTLY AFTER THE FIRST COLLISION AVOIDANCE WARNING, I RECEIVED ANOTHER AND YET ANOTHER. I RESPONDED BY CLBING AND THEN A CLBING TURN AWAY FROM THE TFC. BOTH SUBSEQUENT CLBS PUT ME FURTHER INTO CHICAGO'S CLASS B AIRSPACE. IN MY 9 YRS OF FLYING I HAVE NEVER PENETRATED ANY AIRSPACE WITHOUT PROPER CLRNC. MY HOME BASE, HAS KENNEDY'S CLASS B DIRECTLY ABOVE IT. THEREFORE, I AM KEENLY AWARE OF OPS IN AND AROUND CLASS B AIRSPACES. FURTHERMORE, I HAVE FLOWN INTO PWK DOZENS OF TIMES WITHOUT INCIDENT. I FEEL I WAS FORCED INTO PENETRATING CLASS B AIRSPACE BY A SEQUENCE OF CIRCUMSTANCES BEYOND MY CTL. THE CONCLUSION I HAVE COME TO IS THIS: IF DEPARTING VFR FROM A RWY THAT WILL FACE ME INTO AN AIRSPACE, REQUEST A DOWNWIND DEP THAT WILL ALLOW A 180 DEG TURN AWAY FROM THAT UPCOMING AIRSPACE. I WOULD RECOMMEND THIS AS AN ESTABLISHED PROC AT PWK.

Data retrieved from NASA's ASRS site as of July 2007 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.