Narrative:

This incident occurred at 4SD between my aircraft and a light twin. I was left downwind runway 08 touch and go when the light twin called a 3 mile final; low approach to the ILS to runway 32. I acknowledged his call and asked at what altitude he planned to do the low approach. The twin said he would descend to just above the runway until the end and then go missed. I continued my turn to base with the base call for 08 touch and go. The twin acknowledged and called 2 mile final; low approach. I made the final turn and call and continued to touchdown. I lost visual contact with the twin and continued with the takeoff. I called airborne 08 and started my climb to 400 ft and the end of the runway. Approximately 500 ft prior to the intersection of runways 08 and 32; at about 350 feet AGL I heard the twin call; 'traffic; turn right immediately; right turn now!' I simultaneously lowered the nose and rolled into a 60 degree plus right turn. As the nose came down my windshield filled up with a big blue twin crossing from right to left at my altitude. I continued the turn for 360 degrees to avoid the wake turbulence from the twin. The twin appeared to start an immediate climb from his position and proceed down runway 32 and at the end start a climbing left turn back to the IAF. I re-entered left downwind 08 at the departure end of runway 08 for a full stop. On downwind I ask the twin if he was going to file paperwork and he said no; I said neither was I. We were within 500 ft and evasive action was taken my me to avoid a collision. I told the twin that I thought the design of the instrument approaches were going to conflict with VFR operations on runways 08/26; the twin acknowledged. If two aircraft can get that close when they both knew the approximate locations of each other; I can only imagine what will happen after this ILS is operational and student training is in progress with runway 08 or 26 the wind favored runway.

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Original NASA ASRS Text

Title: Pilot of a low wing experimental aircraft and a King Air experienced a close encounter while shooting approaches and go arounds to intersecting runways at 4SD.

Narrative: This incident occurred at 4SD between my aircraft and a light twin. I was left downwind Runway 08 touch and go when the light twin called a 3 mile final; low approach to the ILS to Runway 32. I acknowledged his call and asked at what altitude he planned to do the low approach. The twin said he would descend to just above the runway until the end and then go missed. I continued my turn to base with the base call for 08 touch and go. The twin acknowledged and called 2 mile final; low approach. I made the final turn and call and continued to touchdown. I lost visual contact with the twin and continued with the takeoff. I called airborne 08 and started my climb to 400 FT and the end of the runway. Approximately 500 FT prior to the intersection of Runways 08 and 32; at about 350 feet AGL I heard the twin call; 'Traffic; turn right immediately; right turn now!' I simultaneously lowered the nose and rolled into a 60 degree plus right turn. As the nose came down my windshield filled up with a big blue twin crossing from right to left at my altitude. I continued the turn for 360 degrees to avoid the wake turbulence from the twin. The twin appeared to start an immediate climb from his position and proceed down Runway 32 and at the end start a climbing left turn back to the IAF. I re-entered left downwind 08 at the departure end of Runway 08 for a full stop. On downwind I ask the twin if he was going to file paperwork and he said no; I said neither was I. We were within 500 FT and evasive action was taken my me to avoid a collision. I told the twin that I thought the design of the instrument approaches were going to conflict with VFR operations on Runways 08/26; the twin acknowledged. If two aircraft can get that close when they both knew the approximate locations of each other; I can only imagine what will happen after this ILS is operational and student training is in progress with Runway 08 or 26 the wind favored runway.

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.