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Flight crew of an medium large transport descended in response to TCASII RA and was instructed to turn by ATC for traffic avoidance.
| Attributes | |
| ACN | 326023 |
| Time | |
| Date | 199601 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ywt |
| State Reference | ON |
| Altitude | msl bound lower : 2400 msl bound upper : 25600 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 225 flight time total : 20000 flight time type : 2000 |
| ASRS Report | 326023 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation other |
Narrative:
065 degree heading for yyz level at FL250. Cleared by ZOB to FL270 and commenced climb, got TCASII traffic alert for yellow target at extreme edge of screen with altitude information not yet shown. Received command for immediate left turn to 360 degree from cle. Disconnected autoplt and rolled vigorously hard left (40 degree bank) with no delay and at same time received RA to 'descend, descend now' lowered nose and went back down through FL250. Observed red target at 2 O'clock with plus 6 altitude tag. With movement indicating clearing to right of our aircraft, stopped descent somewhere above FL240. During resolution, cle directed us to expedite to FL270 at which time we advised we had descended with TCASII RA. Other airline advised they had had an RA as well. Continued and landed at ottawa at XX08.
Original NASA ASRS Text
Title: FLC OF AN MLG DSNDED IN RESPONSE TO TCASII RA AND WAS INSTRUCTED TO TURN BY ATC FOR TFC AVOIDANCE.
Narrative: 065 DEG HDG FOR YYZ LEVEL AT FL250. CLRED BY ZOB TO FL270 AND COMMENCED CLB, GOT TCASII TFC ALERT FOR YELLOW TARGET AT EXTREME EDGE OF SCREEN WITH ALT INFO NOT YET SHOWN. RECEIVED COMMAND FOR IMMEDIATE L TURN TO 360 DEG FROM CLE. DISCONNECTED AUTOPLT AND ROLLED VIGOROUSLY HARD L (40 DEG BANK) WITH NO DELAY AND AT SAME TIME RECEIVED RA TO 'DSND, DSND NOW' LOWERED NOSE AND WENT BACK DOWN THROUGH FL250. OBSERVED RED TARGET AT 2 O'CLOCK WITH PLUS 6 ALT TAG. WITH MOVEMENT INDICATING CLRING TO R OF OUR ACFT, STOPPED DSCNT SOMEWHERE ABOVE FL240. DURING RESOLUTION, CLE DIRECTED US TO EXPEDITE TO FL270 AT WHICH TIME WE ADVISED WE HAD DSNDED WITH TCASII RA. OTHER AIRLINE ADVISED THEY HAD HAD AN RA AS WELL. CONTINUED AND LANDED AT OTTAWA AT XX08.
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.