A109 transiting microphone airspace experienced close call with departure traffic not issued by ATC.

Attributes
ACN	626588
Time
Date	200408
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mic.airport
State Reference	MN
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mic.tower
Operator	common carrier : air taxi
Make Model Name	A109
Operating Under FAR Part	Part 135
Flight Phase	cruise : level
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : mic.tower
Operator	general aviation : personal
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 60 flight time total : 6000 flight time type : 4000
ASRS Report	626588
Person 2
Affiliation	other
Events
Anomaly	conflict : airborne critical
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Miss Distance	horizontal : 500 vertical : 500
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

Reported 8 mi north of microphone for transition through airspace to land at ZZZ. While approaching the departure end of runway 14R, noticed aircraft just lifted off runway 14R. I happened to look to my left front and another aircraft was in a climbing right hand turn below me. If I had not looked and started to descend, I believe it could have been a near midair. Tower controller did not point out either aircraft and when questioned, said 'sorry.' do not know anything about the other aircraft.

Original NASA ASRS Text

Title: A109 TRANSITING MIC AIRSPACE EXPERIENCED CLOSE CALL WITH DEP TFC NOT ISSUED BY ATC.

Narrative: RPTED 8 MI N OF MIC FOR TRANSITION THROUGH AIRSPACE TO LAND AT ZZZ. WHILE APCHING THE DEP END OF RWY 14R, NOTICED ACFT JUST LIFTED OFF RWY 14R. I HAPPENED TO LOOK TO MY L FRONT AND ANOTHER ACFT WAS IN A CLBING R HAND TURN BELOW ME. IF I HAD NOT LOOKED AND STARTED TO DSND, I BELIEVE IT COULD HAVE BEEN A NEAR MIDAIR. TWR CTLR DID NOT POINT OUT EITHER ACFT AND WHEN QUESTIONED, SAID 'SORRY.' DO NOT KNOW ANYTHING ABOUT THE OTHER ACFT.

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.