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TCASII RA senses potential conflict in proximity of TCA and alerts crew regarding 2 other aircraft. Crew reports rapid reversal of commands in a 2-ACFT intruder event.
| Attributes | |
| ACN | 254703 |
| Time | |
| Date | 199310 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : lga |
| State Reference | NY |
| Altitude | msl bound lower : 5000 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 2500 flight time type : 200 |
| ASRS Report | 254703 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe 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 : 15000 vertical : 200 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Vector heading 190 degrees, descending to 4000 ft. TCASII TA 11 O'clock, 100 ft below and 1 O'clock traffic 400 ft above. Both approximately 3 mi. Immediately after TA, received RA for approximately 2000 FPM climb, followed by immediate 'monitor vertical speed,' followed by 'descend' advisory, then clear of conflict advisory. We advised ATC of responding to TCASII advisory, after which ATC advises us of traffic. We then continued descent to 4000 ft and landed at lga. Both were apparently VFR just outside class B airspace. Lessons learned: prepare to react in the opposite direction of initial RA and increase vigilance in popular VFR corridors.
Original NASA ASRS Text
Title: TCASII RA SENSES POTENTIAL CONFLICT IN PROX OF TCA AND ALERTS CREW REGARDING 2 OTHER ACFT. CREW RPTS RAPID REVERSAL OF COMMANDS IN A 2-ACFT INTRUDER EVENT.
Narrative: VECTOR HDG 190 DEGS, DSNDING TO 4000 FT. TCASII TA 11 O'CLOCK, 100 FT BELOW AND 1 O'CLOCK TFC 400 FT ABOVE. BOTH APPROX 3 MI. IMMEDIATELY AFTER TA, RECEIVED RA FOR APPROX 2000 FPM CLB, FOLLOWED BY IMMEDIATE 'MONITOR VERT SPD,' FOLLOWED BY 'DSND' ADVISORY, THEN CLR OF CONFLICT ADVISORY. WE ADVISED ATC OF RESPONDING TO TCASII ADVISORY, AFTER WHICH ATC ADVISES US OF TFC. WE THEN CONTINUED DSCNT TO 4000 FT AND LANDED AT LGA. BOTH WERE APPARENTLY VFR JUST OUTSIDE CLASS B AIRSPACE. LESSONS LEARNED: PREPARE TO REACT IN THE OPPOSITE DIRECTION OF INITIAL RA AND INCREASE VIGILANCE IN POPULAR VFR CORRIDORS.
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.