Near midair collision occurred between arriving reporter aircraft and a departing small aircraft.

Attributes
ACN	112088
Time
Date	198905
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : l39
State Reference	CA
Altitude	msl bound lower : 800 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	descent : approach landing : go around other
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	climbout : initial other
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 90 flight time total : 11000 flight time type : 1100
ASRS Report	112088
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 300 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

I was approaching on a crosswind entry to runway 27 ramona. An small aircraft Y was on a departure. I had just radioed crosswind when I noticed him approaching from below. I took evasive action and turned downwind. Subject aircraft got on radio accusing me of improper pattern entry, improper radio calls and telling all aircraft to 'get the # of that small aircraft X.' I executed a go around from the approach due to an aircraft stopped on the runway. The small aircraft Y, after following around the pattern yelling on the radio, departed the pattern behind me and flew by my aircraft at about 300'. I took evasive action and returned to land at ramona. I later learned that one of the people in the small aircraft Y was an instrument nearby. I believe emphasis needs to be placed on radio discipline and resolving conflicts on the ground. The actions of this aircraft could very easily have resulted in an accident.

Original NASA ASRS Text

Title: NMAC OCCURRED BETWEEN ARRIVING REPORTER ACFT AND A DEPARTING SMA.

Narrative: I WAS APCHING ON A XWIND ENTRY TO RWY 27 RAMONA. AN SMA Y WAS ON A DEP. I HAD JUST RADIOED XWIND WHEN I NOTICED HIM APCHING FROM BELOW. I TOOK EVASIVE ACTION AND TURNED DOWNWIND. SUBJECT ACFT GOT ON RADIO ACCUSING ME OF IMPROPER PATTERN ENTRY, IMPROPER RADIO CALLS AND TELLING ALL ACFT TO 'GET THE # OF THAT SMA X.' I EXECUTED A GAR FROM THE APCH DUE TO AN ACFT STOPPED ON THE RWY. THE SMA Y, AFTER FOLLOWING AROUND THE PATTERN YELLING ON THE RADIO, DEPARTED THE PATTERN BEHIND ME AND FLEW BY MY ACFT AT ABOUT 300'. I TOOK EVASIVE ACTION AND RETURNED TO LAND AT RAMONA. I LATER LEARNED THAT ONE OF THE PEOPLE IN THE SMA Y WAS AN INSTR NEARBY. I BELIEVE EMPHASIS NEEDS TO BE PLACED ON RADIO DISCIPLINE AND RESOLVING CONFLICTS ON THE GND. THE ACTIONS OF THIS ACFT COULD VERY EASILY HAVE RESULTED IN AN ACCIDENT.

Data retrieved from NASA's ASRS site as of August 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.