An small aircraft had an near midair collision with an unknown aircraft. The reporting small aircraft climbed into the base of an overcast to avoid the other aircraft.

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Attributes
ACN	233944
Time
Date	199302
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : nbu
State Reference	IL
Altitude	msl bound lower : 1500 msl bound upper : 1700
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tower : nbu
Operator	general aviation : personal
Make Model Name	Small Aircraft
Flight Phase	cruise other
Flight Plan	None
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other descent other
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 10 flight time total : 425 flight time type : 10
ASRS Report	233944
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : nmac inflight encounter : vfr in imc inflight encounter : weather non adherence : far
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 200 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Myself and converging traffic were both in contact with glenview naval air station's control tower when glenview reported us 1 mi apart, converging at 1500 and 1400 ft, respectively. Converging traffic elected to descend while I elected to climb to 1700 MSL. At 1700 MSL, I was in the base of the overcast layer briefly, but could see the traffic pass below and west of my position. Although I was in the base of the clouds without an instrument clearance momentarily, I think it was a preferable alternative to risking a midair collision. I am instrument rated and had no trouble transitioning to the gauges briefly.

Original NASA ASRS Text

Title: AN SMA HAD AN NMAC WITH AN UNKNOWN ACFT. THE RPTING SMA CLBED INTO THE BASE OF AN OVCST TO AVOID THE OTHER ACFT.

Narrative: MYSELF AND CONVERGING TFC WERE BOTH IN CONTACT WITH GLENVIEW NAVAL AIR STATION'S CTL TWR WHEN GLENVIEW RPTED US 1 MI APART, CONVERGING AT 1500 AND 1400 FT, RESPECTIVELY. CONVERGING TFC ELECTED TO DSND WHILE I ELECTED TO CLB TO 1700 MSL. AT 1700 MSL, I WAS IN THE BASE OF THE OVCST LAYER BRIEFLY, BUT COULD SEE THE TFC PASS BELOW AND W OF MY POS. ALTHOUGH I WAS IN THE BASE OF THE CLOUDS WITHOUT AN INST CLRNC MOMENTARILY, I THINK IT WAS A PREFERABLE ALTERNATIVE TO RISKING A MIDAIR COLLISION. I AM INST RATED AND HAD NO TROUBLE TRANSITIONING TO THE GAUGES BRIEFLY.

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.