 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Flight crew of a B757 descended in response to a TCASII RA and the visual sighting of a canadair challenger climbing up through their altitude to a higher altitude, resulting in less than legal separation.
| Attributes | |
| ACN | 377322 |
| Time | |
| Date | 199708 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : obn |
| State Reference | FO |
| Altitude | msl bound lower : 38700 msl bound upper : 39000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : mteg |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : other oceanic enroute : atlantic enroute airway : ua315 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Challenger Jet Undifferentiated or Other Model |
| Operating Under FAR Part | other : unknown |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : atlantic enroute : other oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 130 flight time total : 10295 flight time type : 2620 |
| ASRS Report | 377322 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 36000 vertical : 1100 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Near vetmo intersection while cruising at FL390, received a TA followed by an RA after a 10 second delay. Port-au-prince control informed us of the traffic while TCASII was issuing the TA alert. Target was visually acquired -- made easier from contrails, and was displayed on EFIS screen. Traffic was an opposite direction challenger jet climbing from FL370- 410. When first displayed as a TA on EFIS, (target) altitude was FL389 and climbing -- however climb rate observed was slow. After TCASII RA alert was sounded, the first officer, who was PF the legs, maneuvered our aircraft in accordance to TCASII instructions. A descent of 300 ft was executed. During our descent challenger jet's rate of climb appeared to increase and when it passed above us its TCASII altitude was above FL400. We were turned over to ZMA shortly after the RA and informed center of the RA and descent.
Original NASA ASRS Text
Title: FLC OF A B757 DSNDED IN RESPONSE TO A TCASII RA AND THE VISUAL SIGHTING OF A CANADAIR CHALLENGER CLBING UP THROUGH THEIR ALT TO A HIGHER ALT, RESULTING IN LESS THAN LEGAL SEPARATION.
Narrative: NEAR VETMO INTXN WHILE CRUISING AT FL390, RECEIVED A TA FOLLOWED BY AN RA AFTER A 10 SECOND DELAY. PORT-AU-PRINCE CTL INFORMED US OF THE TFC WHILE TCASII WAS ISSUING THE TA ALERT. TARGET WAS VISUALLY ACQUIRED -- MADE EASIER FROM CONTRAILS, AND WAS DISPLAYED ON EFIS SCREEN. TFC WAS AN OPPOSITE DIRECTION CHALLENGER JET CLBING FROM FL370- 410. WHEN FIRST DISPLAYED AS A TA ON EFIS, (TARGET) ALT WAS FL389 AND CLBING -- HOWEVER CLB RATE OBSERVED WAS SLOW. AFTER TCASII RA ALERT WAS SOUNDED, THE FO, WHO WAS PF THE LEGS, MANEUVERED OUR ACFT IN ACCORDANCE TO TCASII INSTRUCTIONS. A DSCNT OF 300 FT WAS EXECUTED. DURING OUR DSCNT CHALLENGER JET'S RATE OF CLB APPEARED TO INCREASE AND WHEN IT PASSED ABOVE US ITS TCASII ALT WAS ABOVE FL400. WE WERE TURNED OVER TO ZMA SHORTLY AFTER THE RA AND INFORMED CTR OF THE RA AND DSCNT.
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.