Military transport had near midair collision with small aircraft.

Attributes
ACN	191079
Time
Date	199110
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : nbu
State Reference	IL
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord tower : nbu
Operator	other
Make Model Name	Medium Large Transport
Flight Phase	descent : approach
Route In Use	approach : visual arrival other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	None
Person 1
Affiliation	government : military
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp pilot : military
Experience	flight time last 90 days : 140 flight time total : 2800 flight time type : 2100
ASRS Report	191079
Person 2
Affiliation	government : military
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : military pilot : commercial pilot : atp
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 500 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

We were 6 mi north of glenview NAS on the 002 degree radial at 2000 ft on final approach for runway 17. Other aircraft passed in front approximately 500 ft horizontal. Other plane was a single engine (low wing), white with blue trim. Neither aircraft made any evasive action and I do not believe the other aircraft ever saw us. We had just been cleared for a visual approach to NAS glenview and switched to tower frequency. Neither approach nor the tower notified us of the presence of the other aircraft. Upon landing and speaking with NAS glenview tower, we determined the other aircraft had not checked in with them and they were not aware of his presence. Since we were just outside of the air traffic area that did not surprise us. We were never told by chicago ATC of the other aircraft. As a corrective action I would recommend that chicago approach not switch arriving aircraft to tower frequency until inside the air traffic area unless absolutely certain of no traffic conflicts. The other aircraft was flying eastbound at the same altitude (2000 ft) and passed perpendicular to our flight path. Other possible corrective action would be to always fly an instrument approach into the busy chicago TCA.

Original NASA ASRS Text

Title: MIL TRANSPORT HAD NMAC WITH SMA.

Narrative: WE WERE 6 MI N OF GLENVIEW NAS ON THE 002 DEG RADIAL AT 2000 FT ON FINAL APCH FOR RWY 17. OTHER ACFT PASSED IN FRONT APPROX 500 FT HORIZ. OTHER PLANE WAS A SINGLE ENG (LOW WING), WHITE WITH BLUE TRIM. NEITHER ACFT MADE ANY EVASIVE ACTION AND I DO NOT BELIEVE THE OTHER ACFT EVER SAW US. WE HAD JUST BEEN CLRED FOR A VISUAL APCH TO NAS GLENVIEW AND SWITCHED TO TWR FREQ. NEITHER APCH NOR THE TWR NOTIFIED US OF THE PRESENCE OF THE OTHER ACFT. UPON LNDG AND SPEAKING WITH NAS GLENVIEW TWR, WE DETERMINED THE OTHER ACFT HAD NOT CHKED IN WITH THEM AND THEY WERE NOT AWARE OF HIS PRESENCE. SINCE WE WERE JUST OUTSIDE OF THE ATA THAT DID NOT SURPRISE US. WE WERE NEVER TOLD BY CHICAGO ATC OF THE OTHER ACFT. AS A CORRECTIVE ACTION I WOULD RECOMMEND THAT CHICAGO APCH NOT SWITCH ARRIVING ACFT TO TWR FREQ UNTIL INSIDE THE ATA UNLESS ABSOLUTELY CERTAIN OF NO TFC CONFLICTS. THE OTHER ACFT WAS FLYING EBOUND AT THE SAME ALT (2000 FT) AND PASSED PERPENDICULAR TO OUR FLT PATH. OTHER POSSIBLE CORRECTIVE ACTION WOULD BE TO ALWAYS FLY AN INST APCH INTO THE BUSY CHICAGO TCA.

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.