Near midair collision at a non tower airport when an small aircraft single barely missed a twin piper on departure from the traffic pattern. Aircraft X had entered a long downwind, 800 ft above the tpa.

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Attributes
ACN	396514
Time
Date	199803
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : gai
State Reference	MD
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	other
Route In Use	approach : visual arrival other
Flight Plan	VFR
Aircraft 2
Make Model Name	Piper Twin Piston Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 20 flight time total : 360 flight time type : 78
ASRS Report	396514
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial
Events
Anomaly	conflict : nmac non adherence : far other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 100 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Entering a long downwind at 800 ft above traffic pattern altitude, almost collided with aircraft taking off, departing the pattern. At least, I should have entered a shorter downwind at traffic pattern altitude. Best would have been 45 degrees or crosswind entry. Failure to properly enter pattern almost caused a midair. Other aircraft was a twin piper doing (I believe) closed pattern touch and goes.

Original NASA ASRS Text

Title: NMAC AT A NON TWR ARPT WHEN AN SMA SINGLE BARELY MISSED A TWIN PIPER ON DEP FROM THE TFC PATTERN. ACFT X HAD ENTERED A LONG DOWNWIND, 800 FT ABOVE THE TPA.

Narrative: ENTERING A LONG DOWNWIND AT 800 FT ABOVE TFC PATTERN ALT, ALMOST COLLIDED WITH ACFT TAKING OFF, DEPARTING THE PATTERN. AT LEAST, I SHOULD HAVE ENTERED A SHORTER DOWNWIND AT TFC PATTERN ALT. BEST WOULD HAVE BEEN 45 DEGS OR XWIND ENTRY. FAILURE TO PROPERLY ENTER PATTERN ALMOST CAUSED A MIDAIR. OTHER ACFT WAS A TWIN PIPER DOING (I BELIEVE) CLOSED PATTERN TOUCH AND GOES.

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.