37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Attributes | |
ACN | 300558 |
Time | |
Date | 199503 |
Day | Fri |
Local Time Of Day | 0601 To 1200 |
Place | |
Locale Reference | atc facility : gyy |
State Reference | IN |
Altitude | msl bound lower : 5000 msl bound upper : 6000 |
Environment | |
Flight Conditions | IMC |
Light | Daylight |
Aircraft 1 | |
Controlling Facilities | tracon : ord |
Operator | common carrier : air carrier |
Make Model Name | Commercial Fixed Wing |
Operating Under FAR Part | Part 121 |
Navigation In Use | Other Other |
Flight Phase | cruise other |
Route In Use | enroute : on vectors |
Flight Plan | IFR |
Aircraft 2 | |
Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
Operating Under FAR Part | other : unknown |
Flight Phase | climbout : intermediate altitude cruise other cruise other |
Person 1 | |
Affiliation | company : air carrier |
Function | flight crew : first officer |
Qualification | pilot : atp pilot : flight engineer |
Experience | flight time last 90 days : 200 flight time total : 11000 flight time type : 4000 |
ASRS Report | 300558 |
Person 2 | |
Affiliation | company : air carrier |
Function | flight crew : captain oversight : pic |
Qualification | pilot : atp |
Events | |
Anomaly | altitude deviation : excursion from assigned altitude conflict : nmac non adherence : clearance other anomaly other |
Independent Detector | aircraft equipment other aircraft equipment : unspecified |
Resolutory Action | flight crew : took evasive action |
Consequence | Other |
Miss Distance | horizontal : 0 vertical : 300 |
Supplementary | |
Primary Problem | Flight Crew Human Performance |
Air Traffic Incident | Pilot Deviation |
Narrative:
We were on an assigned heading to intercept mdw runway 31C localizer, assigned altitude was 5000 ft (at pilot's discretion). We were level at 5000 ft. I saw gary airport below us on the right side 3-5 NM through broken clouds. We received a TA and the TCASII showed 2 targets at 1 O'clock, 300 ft below and climbing. Subsequently got a climb RA and captain initiated climb to 6000 ft while I advised ATC. ATC said target was level at 4000 ft, but subsequently he determined traffic was at 5000 ft. I don't know why the controller got no conflict alert, but I think TCASII saved us from a midair collision or a very near miss. Never saw other aircraft due to IMC. Don't know if there were really 2 aircraft of just 1.
Original NASA ASRS Text
Title: NMAC INDICATED ON TCASII.
Narrative: WE WERE ON AN ASSIGNED HDG TO INTERCEPT MDW RWY 31C LOC, ASSIGNED ALT WAS 5000 FT (AT PLT'S DISCRETION). WE WERE LEVEL AT 5000 FT. I SAW GARY ARPT BELOW US ON THE R SIDE 3-5 NM THROUGH BROKEN CLOUDS. WE RECEIVED A TA AND THE TCASII SHOWED 2 TARGETS AT 1 O'CLOCK, 300 FT BELOW AND CLBING. SUBSEQUENTLY GOT A CLB RA AND CAPT INITIATED CLB TO 6000 FT WHILE I ADVISED ATC. ATC SAID TARGET WAS LEVEL AT 4000 FT, BUT SUBSEQUENTLY HE DETERMINED TFC WAS AT 5000 FT. I DON'T KNOW WHY THE CTLR GOT NO CONFLICT ALERT, BUT I THINK TCASII SAVED US FROM A MIDAIR COLLISION OR A VERY NEAR MISS. NEVER SAW OTHER ACFT DUE TO IMC. DON'T KNOW IF THERE WERE REALLY 2 ACFT OF JUST 1.
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.