Narrative:

Return IFR flight from osh to C59 (lake lawn, wi). Had 3 passenger. Tower issued IFR clearance and instructions to fly runway heading. On takeoff clearance from tower, tower issued, 'fly runway heading, cleared for takeoff.' I took off runway 9. After airborne, I told tower I didn't want to fly out over lake winnebago at low altitude. He said, 'fly runway heading, you're IFR.' I stated, 'I'm the guy in the airplane, I don't want to fly over the lake.' I started a slight turn sebound so I wouldn't be over the lake. Tower switched me to ZAU, 127.0. I immediately said I wanted a turn sebound. He granted that. The TCASII went off during this time. Our TCASII has no RA feature. It just says, 'traffic.' there were numerous flts using runway 36 at osh. A C172 was at my 3 O'clock position, moving to 5-6 O'clock position. Distance was no less than 200-300 ft vertically. In retrospect, I should have questioned the 'fly runway heading' clearance before airborne, but I thought I'd be able to negotiate once airborne. I hadn't counted on the numerous traffic in the pattern for runway 36. I just don't like flying out over water at low altitude, outside of gliding distance, with 3 passenger. I should have worked this out on the ground before takeoff.

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Original NASA ASRS Text

Title: A BE35 PLT, DURING DEP FROM OSH ON AN IFR FLT PLAN, EXPRESSED DISCOMFORT ABOUT FLYING OVER LAKE WINNEBAGO AND TURNED, WITHOUT PERMISSION, WHICH CAUSED AN NMAC WITH A C172.

Narrative: RETURN IFR FLT FROM OSH TO C59 (LAKE LAWN, WI). HAD 3 PAX. TWR ISSUED IFR CLRNC AND INSTRUCTIONS TO FLY RWY HDG. ON TKOF CLRNC FROM TWR, TWR ISSUED, 'FLY RWY HDG, CLRED FOR TKOF.' I TOOK OFF RWY 9. AFTER AIRBORNE, I TOLD TWR I DIDN'T WANT TO FLY OUT OVER LAKE WINNEBAGO AT LOW ALT. HE SAID, 'FLY RWY HDG, YOU'RE IFR.' I STATED, 'I'M THE GUY IN THE AIRPLANE, I DON'T WANT TO FLY OVER THE LAKE.' I STARTED A SLIGHT TURN SEBOUND SO I WOULDN'T BE OVER THE LAKE. TWR SWITCHED ME TO ZAU, 127.0. I IMMEDIATELY SAID I WANTED A TURN SEBOUND. HE GRANTED THAT. THE TCASII WENT OFF DURING THIS TIME. OUR TCASII HAS NO RA FEATURE. IT JUST SAYS, 'TFC.' THERE WERE NUMEROUS FLTS USING RWY 36 AT OSH. A C172 WAS AT MY 3 O'CLOCK POS, MOVING TO 5-6 O'CLOCK POS. DISTANCE WAS NO LESS THAN 200-300 FT VERTLY. IN RETROSPECT, I SHOULD HAVE QUESTIONED THE 'FLY RWY HDG' CLRNC BEFORE AIRBORNE, BUT I THOUGHT I'D BE ABLE TO NEGOTIATE ONCE AIRBORNE. I HADN'T COUNTED ON THE NUMEROUS TFC IN THE PATTERN FOR RWY 36. I JUST DON'T LIKE FLYING OUT OVER WATER AT LOW ALT, OUTSIDE OF GLIDING DISTANCE, WITH 3 PAX. I SHOULD HAVE WORKED THIS OUT ON THE GND BEFORE TKOF.

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.