Near midair collision between an small aircraft sel departing at 500 ft AGL and an arriving unknown aircraft at 600 ft. Reporter took evasive action by sidestepping to the side.

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Attributes
ACN	339678
Time
Date	199606
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mri
State Reference	AK
Altitude	msl bound lower : 500 msl bound upper : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mri
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	approach : visual departure other
Flight Plan	None
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	approach : visual arrival other
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 76 flight time total : 3558 flight time type : 388
ASRS Report	339678
Person 2
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 400 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Takeoff normal on mri runway 15 and chester creek departure was flown. 1 min into flight, now wbound and 500 ft MSL, an eastbound aircraft was observed at 12 O'clock and 2 mi and 600 ft. Turned landing light on and sidestepped north 300 ft to increase clearance to opposing aircraft. Observed other aircraft turning south, as we passed uneventfully, 100 ft vertical, 400 ft horizontal clearance. At time of passing other aircraft was 1/4 mi north of 'west hi' reporting point for mri runway 33. The other pilot announced a 'near miss' on mri tower frequency 126.0, with one repeat. I announced on same frequency after a min delay that it was not 'close' and that I had the aircraft in sight. The delay was caused while looking for a second aircraft on the same approach to mri. I considered the event unremarkable and did not contemplate filing this report, until I found that the other pilot did not have the same observations. See and be seen is a must as well as overflying reporting points, in these control segments. Frequency congestion occasionally prevent announcing arrival at reporting points, but being on an expected route prevents traffic conflict.

Original NASA ASRS Text

Title: NMAC BTWN AN SMA SEL DEPARTING AT 500 FT AGL AND AN ARRIVING UNKNOWN ACFT AT 600 FT. RPTR TOOK EVASIVE ACTION BY SIDESTEPPING TO THE SIDE.

Narrative: TKOF NORMAL ON MRI RWY 15 AND CHESTER CREEK DEP WAS FLOWN. 1 MIN INTO FLT, NOW WBOUND AND 500 FT MSL, AN EBOUND ACFT WAS OBSERVED AT 12 O'CLOCK AND 2 MI AND 600 FT. TURNED LNDG LIGHT ON AND SIDESTEPPED N 300 FT TO INCREASE CLRNC TO OPPOSING ACFT. OBSERVED OTHER ACFT TURNING S, AS WE PASSED UNEVENTFULLY, 100 FT VERT, 400 FT HORIZ CLRNC. AT TIME OF PASSING OTHER ACFT WAS 1/4 MI N OF 'WEST HI' RPTING POINT FOR MRI RWY 33. THE OTHER PLT ANNOUNCED A 'NEAR MISS' ON MRI TWR FREQ 126.0, WITH ONE REPEAT. I ANNOUNCED ON SAME FREQ AFTER A MIN DELAY THAT IT WAS NOT 'CLOSE' AND THAT I HAD THE ACFT IN SIGHT. THE DELAY WAS CAUSED WHILE LOOKING FOR A SECOND ACFT ON THE SAME APCH TO MRI. I CONSIDERED THE EVENT UNREMARKABLE AND DID NOT CONTEMPLATE FILING THIS RPT, UNTIL I FOUND THAT THE OTHER PLT DID NOT HAVE THE SAME OBSERVATIONS. SEE AND BE SEEN IS A MUST AS WELL AS OVERFLYING RPTING POINTS, IN THESE CTL SEGMENTS. FREQ CONGESTION OCCASIONALLY PREVENT ANNOUNCING ARR AT RPTING POINTS, BUT BEING ON AN EXPECTED RTE PREVENTS TFC CONFLICT.

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.