Narrative:

We were departing oshkosh during FAA convention on a planned IFR flight plan. We were stuck with a firm scheduled departure time as we were flying officers of our company in our corporate jet. Though we followed all procedures and were ready to depart by xx:20 pm it was clear we would not receive takeoff clearance before the scheduled airport closing at xy:30 pm. We were #35 for IFR departure at xx:20. By xy:00 pm we were still #30. This left us 2 options. Depart VFR or spend the night (no hotel rooms or cars in town). We departed VFR. We possessed the necessary charts for the FAA special traffic management program and briefed the departure. I taxied the aircraft. The first officer, who would be flying, had the procedures on his yoke clip. He briefed the departure instructions. We were cleared for takeoff on runway 27 by the 'flagman'. After takeoff several things occurred. Thought the reported WX included scattered clouds at 2000 ft AGL there were scattered to broken clouds much lower. In order to maintain VFR cloud separation it was not possible to climb directly to 1500 ft AGL for turbine aircraft departure altitude. It was several mins before reaching this altitude. In an effort to maintain VFR, PF turned ese near east airport boundary. Later review of procedure showed this was wrong. We should have cleared the traffic area first. The whole situation would have been avoided had all IFR departures been accommodated. Also I should have read the departure procedures myself. We did complete flight and receive an IFR clearance later without incident. The firm closing time of the airport needs to be modified.

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Original NASA ASRS Text

Title: CPR LTT LEAVES AIRSHOW IN FACE OF LOW CEILINGS. MAY HAVE FLOWN IN CLOSE PROX OF CLOUD.

Narrative: WE WERE DEPARTING OSHKOSH DURING FAA CONVENTION ON A PLANNED IFR FLT PLAN. WE WERE STUCK WITH A FIRM SCHEDULED DEP TIME AS WE WERE FLYING OFFICERS OF OUR COMPANY IN OUR CORPORATE JET. THOUGH WE FOLLOWED ALL PROCS AND WERE READY TO DEPART BY XX:20 PM IT WAS CLR WE WOULD NOT RECEIVE TKOF CLRNC BEFORE THE SCHEDULED ARPT CLOSING AT XY:30 PM. WE WERE #35 FOR IFR DEP AT XX:20. BY XY:00 PM WE WERE STILL #30. THIS L US 2 OPTIONS. DEPART VFR OR SPEND THE NIGHT (NO HOTEL ROOMS OR CARS IN TOWN). WE DEPARTED VFR. WE POSSESSED THE NECESSARY CHARTS FOR THE FAA SPECIAL TFC MGMNT PROGRAM AND BRIEFED THE DEP. I TAXIED THE ACFT. THE FO, WHO WOULD BE FLYING, HAD THE PROCS ON HIS YOKE CLIP. HE BRIEFED THE DEP INSTRUCTIONS. WE WERE CLRED FOR TKOF ON RWY 27 BY THE 'FLAGMAN'. AFTER TKOF SEVERAL THINGS OCCURRED. THOUGHT THE RPTED WX INCLUDED SCATTERED CLOUDS AT 2000 FT AGL THERE WERE SCATTERED TO BROKEN CLOUDS MUCH LOWER. IN ORDER TO MAINTAIN VFR CLOUD SEPARATION IT WAS NOT POSSIBLE TO CLB DIRECTLY TO 1500 FT AGL FOR TURBINE ACFT DEP ALT. IT WAS SEVERAL MINS BEFORE REACHING THIS ALT. IN AN EFFORT TO MAINTAIN VFR, PF TURNED ESE NEAR E ARPT BOUNDARY. LATER REVIEW OF PROC SHOWED THIS WAS WRONG. WE SHOULD HAVE CLRED THE TFC AREA FIRST. THE WHOLE SITUATION WOULD HAVE BEEN AVOIDED HAD ALL IFR DEPS BEEN ACCOMMODATED. ALSO I SHOULD HAVE READ THE DEP PROCS MYSELF. WE DID COMPLETE FLT AND RECEIVE AN IFR CLRNC LATER WITHOUT INCIDENT. THE FIRM CLOSING TIME OF THE ARPT NEEDS TO BE MODIFIED.

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.