A private pilot in a C152 has a potential conflict with a B737 while transiting near the gary airport at 3500 ft. Pilot sees the air carrier and descends with a horizontal distance of about 1 mi.

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Attributes
ACN	388790
Time
Date	199710
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : gyy
State Reference	IN
Altitude	msl bound lower : 2400 msl bound upper : 3500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : gyy
Operator	general aviation : personal
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	VFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other descent other
Route In Use	arrival other enroute : on vectors enroute other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 38 flight time total : 126 flight time type : 69
ASRS Report	388790
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	conflict : airborne less severe other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

At XX18 pm on oct/sun/97, I was on a cross country to 08C from lot. I flew from lot direct to cgt VOR. Upon crossing cgt VOR, I called gary tower and told them 'cessna XXX is level at 2600 ft would like transition from cgt to the lakefront.' he replied 'transition approved.' I then climbed to 3500 ft so I could cruise at a VFR cruising altitude and lean the mixture. I leveled off at 3500 ft and dead ahead was an airline B737. I then pulled carburetor heat and throttle to idle and maneuvered into a dive. While in the dive I heard the roar of the engines overhead. I leveled off at 2400 ft and called gary tower to tell them what had happened.

Original NASA ASRS Text

Title: A PVT PLT IN A C152 HAS A POTENTIAL CONFLICT WITH A B737 WHILE TRANSITING NEAR THE GARY ARPT AT 3500 FT. PLT SEES THE ACR AND DSNDS WITH A HORIZ DISTANCE OF ABOUT 1 MI.

Narrative: AT XX18 PM ON OCT/SUN/97, I WAS ON A XCOUNTRY TO 08C FROM LOT. I FLEW FROM LOT DIRECT TO CGT VOR. UPON XING CGT VOR, I CALLED GARY TWR AND TOLD THEM 'CESSNA XXX IS LEVEL AT 2600 FT WOULD LIKE TRANSITION FROM CGT TO THE LAKEFRONT.' HE REPLIED 'TRANSITION APPROVED.' I THEN CLBED TO 3500 FT SO I COULD CRUISE AT A VFR CRUISING ALT AND LEAN THE MIXTURE. I LEVELED OFF AT 3500 FT AND DEAD AHEAD WAS AN AIRLINE B737. I THEN PULLED CARB HEAT AND THROTTLE TO IDLE AND MANEUVERED INTO A DIVE. WHILE IN THE DIVE I HEARD THE ROAR OF THE ENGS OVERHEAD. I LEVELED OFF AT 2400 FT AND CALLED GARY TWR TO TELL THEM WHAT HAD HAPPENED.

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.