<< >> NASA ASRS Report 366339, April 1997

Pilot of a C172 was startled to observe a bizjet taking evasive action to avoid him when en route transiting a class B airspace. However, ATC had previously informed him that they did not observe his mode C readout, which was later confirmed by approach control.

Attributes
ACN	366339
Time
Date	199704
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cdw
State Reference	NJ
Altitude	msl bound lower : 2500 msl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : cdw
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	VFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	descent : approach descent other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 30 flight time total : 200 flight time type : 200
ASRS Report	366339
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe conflict : airborne less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 2000 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

I was cruising at 2500 ft in cdw airspace, in contact with cdw tower. During a scan, I leaned forward to see around my front seat passenger, and observed a 2-ENG bizjet taking evasive action to avoid me. He was at my 3-4 O'clock position. He turned and crossed behind me. I commented to cdw that we'd had a close encounter with a jet and was advised he was probably IFR into teb, whose approach crosses cdw airspace. I had no warning of the jet's presence. My aircraft was functioning fully normally, except for a report from pvd tower (where I'd just departed) that mode C was inoperative. This was later confirmed upon my inquiry to new york approach during flight over central connecticut en route to mmu.

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Original NASA ASRS Text

Title: PLT OF A C172 WAS STARTLED TO OBSERVE A BIZJET TAKING EVASIVE ACTION TO AVOID HIM WHEN ENRTE TRANSITING A CLASS B AIRSPACE. HOWEVER, ATC HAD PREVIOUSLY INFORMED HIM THAT THEY DID NOT OBSERVE HIS MODE C READOUT, WHICH WAS LATER CONFIRMED BY APCH CTL.

Narrative: I WAS CRUISING AT 2500 FT IN CDW AIRSPACE, IN CONTACT WITH CDW TWR. DURING A SCAN, I LEANED FORWARD TO SEE AROUND MY FRONT SEAT PAX, AND OBSERVED A 2-ENG BIZJET TAKING EVASIVE ACTION TO AVOID ME. HE WAS AT MY 3-4 O'CLOCK POS. HE TURNED AND CROSSED BEHIND ME. I COMMENTED TO CDW THAT WE'D HAD A CLOSE ENCOUNTER WITH A JET AND WAS ADVISED HE WAS PROBABLY IFR INTO TEB, WHOSE APCH CROSSES CDW AIRSPACE. I HAD NO WARNING OF THE JET'S PRESENCE. MY ACFT WAS FUNCTIONING FULLY NORMALLY, EXCEPT FOR A RPT FROM PVD TWR (WHERE I'D JUST DEPARTED) THAT MODE C WAS INOP. THIS WAS LATER CONFIRMED UPON MY INQUIRY TO NEW YORK APCH DURING FLT OVER CENTRAL CONNECTICUT ENRTE TO MMU.

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.