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Air carrier X TCASII TA with VFR aircraft Y evasive action taken descent from assigned altitude. Non adherence to ATC clearance.
| Attributes | |
| ACN | 201468 |
| Time | |
| Date | 199202 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : lga |
| State Reference | NY |
| Altitude | msl bound lower : 4700 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | 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 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 225 flight time total : 12000 flight time type : 300 |
| ASRS Report | 201468 |
| 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 |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X was on radar vector heading level about 5000 ft MSL when TCASII alert sounded and red lights on vertical speed lit up. Monitor vertical speed sounded. This is very unsettling in a dark cockpit at night . We looked outside and saw traffic Y heading directly at us amongst the city lights. I guess this was VFR traffic at 500 ft above us probably assigned. All pilots I've flown with don't consider 500 ft adequate spacing. Visually you couldn't tell if we had adequate spacing. The captain elected to descend 300 ft.
Original NASA ASRS Text
Title: ACR X TCASII TA WITH VFR ACFT Y EVASIVE ACTION TAKEN DSCNT FROM ASSIGNED ALT. NON ADHERENCE TO ATC CLRNC.
Narrative: ACR X WAS ON RADAR VECTOR HDG LEVEL ABOUT 5000 FT MSL WHEN TCASII ALERT SOUNDED AND RED LIGHTS ON VERT SPD LIT UP. MONITOR VERT SPD SOUNDED. THIS IS VERY UNSETTLING IN A DARK COCKPIT AT NIGHT . WE LOOKED OUTSIDE AND SAW TFC Y HDG DIRECTLY AT US AMONGST THE CITY LIGHTS. I GUESS THIS WAS VFR TFC AT 500 FT ABOVE US PROBABLY ASSIGNED. ALL PLTS I'VE FLOWN WITH DON'T CONSIDER 500 FT ADEQUATE SPACING. VISUALLY YOU COULDN'T TELL IF WE HAD ADEQUATE SPACING. THE CAPT ELECTED TO DSND 300 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.