Close proximity GA-small aircraft air carrier-medium large transport over eon VOR.

Attributes
ACN	92483
Time
Date	198808
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : eon
State Reference	IL
Altitude	msl bound lower : 9500 msl bound upper : 9500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Flight Plan	None
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time total : 6500
ASRS Report	92483
Events
Anomaly	conflict : airborne less severe
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 2500 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Eastbound small aircraft, mine, cruising VFR at 9500' MSL. Northbound jet airliner. Observed airliner rapidly approaching on right side at 3 O'clock position slightly above, crossed behind small aircraft directly over eon VOR at 9500', estimated closest proximity 2500'. Note: suggest high speed jet traffic be especially vigilant to avoid VFR altitudes (thousands + 500) over vors when climbing or descending in VFR conditions. 10/87 we had a similar encounter which required evasive action over cgt when we met a jet airliner at 6500' MSL nose to nose. No report filed. Recommend: when near concentration of heavy traffic (chicago, atlanta, etc) suggest establish communications with traffic advisory controllers. Keep high speed traffic inside TCA's until above 10000' MSL. In 1987 we sighted numerous airliners as far west of chicago as joliet at the 6000' MSL level. The sky is 3 dimensional. Keep the high speed traffic above 10000', especially arriving aircraft wherein pilots are busy with checklists and the nose is often in a high position obstructing vision.

Original NASA ASRS Text

Title: CLOSE PROX GA-SMA ACR-MLG OVER EON VOR.

Narrative: EBND SMA, MINE, CRUISING VFR AT 9500' MSL. NBOUND JET AIRLINER. OBSERVED AIRLINER RAPIDLY APCHING ON RIGHT SIDE AT 3 O'CLOCK POS SLIGHTLY ABOVE, CROSSED BEHIND SMA DIRECTLY OVER EON VOR AT 9500', ESTIMATED CLOSEST PROX 2500'. NOTE: SUGGEST HIGH SPD JET TFC BE ESPECIALLY VIGILANT TO AVOID VFR ALTS (THOUSANDS + 500) OVER VORS WHEN CLBING OR DSNDING IN VFR CONDITIONS. 10/87 WE HAD A SIMILAR ENCOUNTER WHICH REQUIRED EVASIVE ACTION OVER CGT WHEN WE MET A JET AIRLINER AT 6500' MSL NOSE TO NOSE. NO RPT FILED. RECOMMEND: WHEN NEAR CONCENTRATION OF HVY TFC (CHICAGO, ATLANTA, ETC) SUGGEST ESTABLISH COMS WITH TFC ADVISORY CTLRS. KEEP HIGH SPD TFC INSIDE TCA'S UNTIL ABOVE 10000' MSL. IN 1987 WE SIGHTED NUMEROUS AIRLINERS AS FAR W OF CHICAGO AS JOLIET AT THE 6000' MSL LEVEL. THE SKY IS 3 DIMENSIONAL. KEEP THE HIGH SPD TFC ABOVE 10000', ESPECIALLY ARRIVING ACFT WHEREIN PLTS ARE BUSY WITH CHKLISTS AND THE NOSE IS OFTEN IN A HIGH POS OBSTRUCTING VISION.

Data retrieved from NASA's ASRS site as of August 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.