GA pilot reported a near midair collision while flying in the vicinity of a non-towered airport.

Attributes
ACN	1544041
Time
Date	201805
Local Time Of Day	0601-1200
Place
Locale Reference	SSI.Airport
State Reference	GA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft Low Wing 1 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Person 1
Function	Single Pilot
Qualification	Flight Crew Commercial Flight Crew Multiengine Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 7000 Flight Crew Type 300
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 50 Vertical 300

Narrative:

Flying south along the beach at 500 ft; passing the active runway 1/2 mile to the right when aircraft Y passed on my left on the downwind about 300 ft above me. I intended to fly down the beach until clear of the airport pattern and climb to pattern altitude then turn on a 45 degree entry to the downwind for runway 22 at ssi. I felt I was further east of the downwind leg and had called my position 10 north and intentions on the CTAF frequency. I heard aircraft Y call his position; but felt I was lower and further east from the downwind leg and would not be a factor. I saw him just as he passed above us.

Original NASA ASRS Text

Title: GA pilot reported a NMAC while flying in the vicinity of a non-towered airport.

Narrative: Flying south along the beach at 500 ft; passing the active runway 1/2 mile to the right when Aircraft Y passed on my left on the downwind about 300 ft above me. I intended to fly down the beach until clear of the airport pattern and climb to pattern altitude then turn on a 45 degree entry to the downwind for runway 22 at SSI. I felt I was further east of the downwind leg and had called my position 10 north and intentions on the CTAF frequency. I heard Aircraft Y call his position; but felt I was lower and further east from the downwind leg and would not be a factor. I saw him just as he passed above us.

Data retrieved from NASA's ASRS site 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.