Narrative:

After landing in airport I spoke with the assistant chief pilot multiple times about the weather and our concerns; we agreed the weather was acceptable for me to depart the airport which I agreed on; and received a release to continue to my next destination with cargo. The weather was reporting 070/14 gusting 23; visibility 9 SM; broken 1;800 ft. I was not expecting to exceed personal limitations with the current conditions. I had just landed minutes before in these conditions which led me to believe I was within my limits plus I was within company limitations. I picked up my clearance and lined up on the runway for departure which was my best choice for wind direction. During takeoff between scanning the inside and outside the aircraft I saw the runway edge lights getting closer and heard a bang outside the plane. This happened right at rotation speed; I determined the safest course of action was to continue with the take off. Once airborne I decided to return to the airport so maintenance could inspect the aircraft. I communicated via company radio to keep company in the loop and of the change of plans; I continued to monitor all aircraft instruments finding all to be normal then cycled the gear finding their operation normal as well and then returned to land. Company maintenance inspected the aircraft and found no aircraft damage. Later; I found out one of my mains had run off the runway; there was a large distance between runway edge lights and edge of runway. As for the bang; there was a concrete pathway that leads off the runway at a 90 degree angle. When I passed over this it made a loud bang. With what I know now I would definitely not depart in this weather situation; gusty winds and heavy rain. Although the weather reports were well within limits they deteriorated significantly when rain increased during takeoff. I had no idea this weather combination would have such a strong affect on staying centered during takeoff. I have now changed my stance to a more conservative approach regarding what weather I will accept for take off. Taking off in heavy rain alone; I now see as not a good idea; although the level of rain was varying I will be quick to watch for this in the future. Then add gusty winds; night and single pilot all equate to even greater reason that the flight should not happen at this time.

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Original NASA ASRS Text

Title: A BE-99 pilot was unable to maintain the runway centerline on takeoff in inclement conditions; exited the runway surface with the left main gear and bumped over a runway exit; causing him to believe he had struck a runway light. The flight returned to the departure airport where no damage was found.

Narrative: After landing in airport I spoke with the Assistant Chief Pilot multiple times about the weather and our concerns; we agreed the weather was acceptable for me to depart the airport which I agreed on; and received a release to continue to my next destination with cargo. The weather was reporting 070/14 gusting 23; visibility 9 SM; broken 1;800 FT. I was not expecting to exceed personal limitations with the current conditions. I had just landed minutes before in these conditions which led me to believe I was within my limits plus I was within company limitations. I picked up my clearance and lined up on the runway for departure which was my best choice for wind direction. During takeoff between scanning the inside and outside the aircraft I saw the runway edge lights getting closer and heard a bang outside the plane. This happened right at rotation speed; I determined the safest course of action was to continue with the take off. Once airborne I decided to return to the airport so Maintenance could inspect the aircraft. I communicated via company radio to keep company in the loop and of the change of plans; I continued to monitor all aircraft instruments finding all to be normal then cycled the gear finding their operation normal as well and then returned to land. Company Maintenance inspected the aircraft and found no aircraft damage. Later; I found out one of my mains had run off the runway; there was a large distance between runway edge lights and edge of runway. As for the bang; there was a concrete pathway that leads off the runway at a 90 degree angle. When I passed over this it made a loud bang. With what I know now I would definitely not depart in this weather situation; gusty winds and heavy rain. Although the weather reports were well within limits they deteriorated significantly when rain increased during takeoff. I had no idea this weather combination would have such a strong affect on staying centered during takeoff. I have now changed my stance to a more conservative approach regarding what weather I will accept for take off. Taking off in heavy rain alone; I now see as not a good idea; although the level of rain was varying I will be quick to watch for this in the future. Then add gusty winds; night and single pilot all equate to even greater reason that the flight should not happen at this time.

Data retrieved from NASA's ASRS site as of April 2012 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.