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Flight crew of an large transport air carrier aircraft stopped descent and climbed in response to a TCASII RA.
| Attributes | |
| ACN | 248205 |
| Time | |
| Date | 199308 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 13500 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Transport |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 185 flight time total : 13820 flight time type : 615 |
| ASRS Report | 248205 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : atp pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 3000 vertical : 800 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Cleared to descend to 13000 ft, direct to plant intersection on knox arrival to ord. Passing 15000 ft controller issued traffic warning at our 12 O'clock position. Did not have visual but target was on our TCASII scope. Target was below and climbing. Several seconds later, we got a TA and then an RA to climb. I stopped descent and climb approximately 300-500 ft before TCASII gave us a monitor vertical speed and then clear of conflict. Without TCASII this would have been a very close miss, target was a twin climbing to 13500 ft VFR. We advised ATC of the RA and they said we were clear of traffic and to continue our descent to 11000 ft.
Original NASA ASRS Text
Title: FLC OF AN LGT ACR ACFT STOPPED DSCNT AND CLBED IN RESPONSE TO A TCASII RA.
Narrative: CLRED TO DSND TO 13000 FT, DIRECT TO PLANT INTXN ON KNOX ARR TO ORD. PASSING 15000 FT CTLR ISSUED TFC WARNING AT OUR 12 O'CLOCK POS. DID NOT HAVE VISUAL BUT TARGET WAS ON OUR TCASII SCOPE. TARGET WAS BELOW AND CLBING. SEVERAL SECONDS LATER, WE GOT A TA AND THEN AN RA TO CLB. I STOPPED DSCNT AND CLB APPROX 300-500 FT BEFORE TCASII GAVE US A MONITOR VERT SPD AND THEN CLR OF CONFLICT. WITHOUT TCASII THIS WOULD HAVE BEEN A VERY CLOSE MISS, TARGET WAS A TWIN CLBING TO 13500 FT VFR. WE ADVISED ATC OF THE RA AND THEY SAID WE WERE CLR OF TFC AND TO CONTINUE OUR DSCNT TO 11000 FT.
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.