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Air carrier medium large transport altitude deviation excursion from clearance altitude in response to TCASII RA. Descent put medium large transport at same altitude as other crossing traffic that was not seen on TCASII nor sighted by flight crew.
| Attributes | |
| ACN | 194428 |
| Time | |
| Date | 199111 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : isp |
| State Reference | NY |
| Altitude | msl bound lower : 2500 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 10000 flight time type : 2500 |
| ASRS Report | 194428 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| ASRS Report | 194424 |
| 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 | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
ATC advised us of 12 O'clock traffic at 3500 ft MSL (no visual). In accordance with procedures the crew followed the TCASII issued instructions to descend to approximately 2500 ft MSL. As per procedures ATC was advised of TCASII instructions as aircraft left altitude. The crew was subsequently advised that there was converging traffic at 2500 ft. No visual contact was made with the 2500 ft traffic. At uneventful approach and landing was then executed. TCASII debrief forms were submitted by both flight crew and ATC controller.
Original NASA ASRS Text
Title: ACR MLG ALTDEV EXCURSION FROM CLRNC ALT IN RESPONSE TO TCASII RA. DSCNT PUT MLG AT SAME ALT AS OTHER XING TFC THAT WAS NOT SEEN ON TCASII NOR SIGHTED BY FLC.
Narrative: ATC ADVISED US OF 12 O'CLOCK TFC AT 3500 FT MSL (NO VISUAL). IN ACCORDANCE WITH PROCS THE CREW FOLLOWED THE TCASII ISSUED INSTRUCTIONS TO DSND TO APPROX 2500 FT MSL. AS PER PROCS ATC WAS ADVISED OF TCASII INSTRUCTIONS AS ACFT LEFT ALT. THE CREW WAS SUBSEQUENTLY ADVISED THAT THERE WAS CONVERGING TFC AT 2500 FT. NO VISUAL CONTACT WAS MADE WITH THE 2500 FT TFC. AT UNEVENTFUL APCH AND LNDG WAS THEN EXECUTED. TCASII DEBRIEF FORMS WERE SUBMITTED BY BOTH FLC AND ATC CTLR.
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.