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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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TCASII RA creates an altitude deviation altitude excursion by PIC in pilot response to another aircraft in descent procedure and high descent rate and altitude deviation altitude overshoot.
| Attributes | |
| ACN | 200253 |
| Time | |
| Date | 199201 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : etg |
| State Reference | PA |
| Altitude | msl bound lower : 27400 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time total : 23000 flight time type : 5000 |
| ASRS Report | 200253 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : clearance 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 | faa : reviewed incident with flight crew Other |
| Miss Distance | horizontal : 200 vertical : 1500 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
In cruise at 28000 ft TCASII gave a TA followed by an RA and a descend command. We descended 600 ft below assigned altitude and received a 'clear of conflict', and resumed altitude, notified ATC. The other aircraft (an airliner) was descending to 29000 ft, (1000 ft above us) which caused the RA. TCASII has no way of knowing the other aircraft will level off above which causes this situation.
Original NASA ASRS Text
Title: TCASII RA CREATES AN ALTDEV ALT EXCURSION BY PIC IN PLT RESPONSE TO ANOTHER ACFT IN DSCNT PROC AND HIGH DSCNT RATE AND ALTDEV ALT OVERSHOOT.
Narrative: IN CRUISE AT 28000 FT TCASII GAVE A TA FOLLOWED BY AN RA AND A DSND COMMAND. WE DSNDED 600 FT BELOW ASSIGNED ALT AND RECEIVED A 'CLR OF CONFLICT', AND RESUMED ALT, NOTIFIED ATC. THE OTHER ACFT (AN AIRLINER) WAS DSNDING TO 29000 FT, (1000 FT ABOVE US) WHICH CAUSED THE RA. TCASII HAS NO WAY OF KNOWING THE OTHER ACFT WILL LEVEL OFF ABOVE WHICH CAUSES THIS SITUATION.
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.