Narrative:

I was on approach (GPS LNAV/VNAV); in IMC. ASOS reported ceiling 800 ft. Approach called '2000 ft till established; cleared for the GPS runway xx approach ZZZ.' at about 1800 ft approach called 'radar service terminated; cancel on the ground or in the air.' I was IMC at the time and did not switch to unicom. I continued on the approach and broke out of the clouds at -900 ft (da 570 ft) and immediately canceled IFR and switched to unicom. At the next moment; I both observed and was alerted (on unicom) to a twin (abc airlines) on short final; about 0.5 miles ahead of me. I slowed as much as possible and chose to land; a moment after the other plane cleared the runway. When I entered the FBO; I asked how that 'airline' had arrived VFR in such poor weather (they were not on ATC frequency during my approach) and was told that they 'have a special VFR waiver and always operate; even in much lower weather' and I 'should have been monitoring unicom during my approach.' I contacted abc airlines and asked about their procedures and was told that they 'routinely fly VFR with 500 ft ceilings and will go down to 300 ft ceiling with 2 mile visibility.' I asked if they monitor approach and was told; 'some of the pilots do.' considerations: I should have switched to and reported to and monitored unicom as soon as I was 'radar service terminated.' I never expected there to be VFR traffic in the weather in this airspace. Shouldn't an aircraft on an SVFR clearance be in contact with ATC?

Related reports:

Google
 

Original NASA ASRS Text

Title: A Beechcraft A35 broke out on an instrument approach to an uncontrolled airport to find an aircraft 1/2 mile ahead of him making a VFR approach.

Narrative: I was on approach (GPS LNAV/VNAV); in IMC. ASOS reported ceiling 800 FT. Approach called '2000 FT till established; cleared for the GPS Runway XX approach ZZZ.' At about 1800 FT Approach called 'radar service terminated; cancel on the ground or in the air.' I was IMC at the time and did not switch to UNICOM. I continued on the approach and broke out of the clouds at -900 FT (DA 570 FT) and immediately canceled IFR and switched to UNICOM. At the next moment; I both observed and was alerted (on UNICOM) to a twin (ABC Airlines) on short final; about 0.5 miles ahead of me. I slowed as much as possible and chose to land; a moment after the other plane cleared the runway. When I entered the FBO; I asked how that 'airline' had arrived VFR in such poor weather (they were not on ATC frequency during my approach) and was told that they 'have a special VFR waiver and always operate; even in much lower weather' and I 'should have been monitoring UNICOM during my approach.' I contacted ABC Airlines and asked about their procedures and was told that they 'routinely fly VFR with 500 FT ceilings and will go down to 300 FT ceiling with 2 mile visibility.' I asked if they monitor Approach and was told; 'some of the pilots do.' Considerations: I should have switched to and reported to and monitored UNICOM as soon as I was 'radar service terminated.' I never expected there to be VFR traffic in the weather in this airspace. Shouldn't an aircraft on an SVFR clearance be in contact with ATC?

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.