 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Potential conflict occurs when a visual climb is assigned to a citation jet that then came too close to a B737-800 in cruise at 16000 ft on frequency with ZBW, nh.
| Attributes | |
| ACN | 539401 |
| Time | |
| Date | 200203 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : bdl.vortac |
| State Reference | CT |
| Altitude | msl single value : 16000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air taxi |
| Make Model Name | Cessna Citation Undifferentiated or Other Model |
| Operating Under FAR Part | Part 135 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 175 flight time total : 6250 flight time type : 611.43 |
| ASRS Report | 539401 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation non adherence : clearance non adherence : far non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | flight crew : took evasive action other |
| Miss Distance | horizontal : 50000 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance Airspace Structure Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
In level cruise at 16000 ft wbound, ZBW reported traffic converging at 1-2 O'clock position at 15000 ft swbound at 10 mi. We had a TCASII target at that location. We picked up the target visually. The controller asked the traffic (cessna citation), if he has us visually. He reported us in sight. ZBW then cleared him to maintain visual separation and climb to FL200. Cessna then commenced his climb when approximately 3 mi at our 1 O'clock position, TCASII then displayed a TA with aural warning. Immediately followed by a TCASII RA commanding a climb. As we complied with the RA by climbing, cessna passed below our nose at less than 300 ft vertical separation and less than 1 mi horizontally. We reported our evasive action to ZBW and returned to our assigned altitude when clear of the conflict.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT OCCURS WHEN A VISUAL CLB IS ASSIGNED TO A CITATION JET THAT THEN CAME TOO CLOSE TO A B737-800 IN CRUISE AT 16000 FT ON FREQ WITH ZBW, NH.
Narrative: IN LEVEL CRUISE AT 16000 FT WBOUND, ZBW RPTED TFC CONVERGING AT 1-2 O'CLOCK POS AT 15000 FT SWBOUND AT 10 MI. WE HAD A TCASII TARGET AT THAT LOCATION. WE PICKED UP THE TARGET VISUALLY. THE CTLR ASKED THE TFC (CESSNA CITATION), IF HE HAS US VISUALLY. HE RPTED US IN SIGHT. ZBW THEN CLRED HIM TO MAINTAIN VISUAL SEPARATION AND CLB TO FL200. CESSNA THEN COMMENCED HIS CLB WHEN APPROX 3 MI AT OUR 1 O'CLOCK POS, TCASII THEN DISPLAYED A TA WITH AURAL WARNING. IMMEDIATELY FOLLOWED BY A TCASII RA COMMANDING A CLB. AS WE COMPLIED WITH THE RA BY CLBING, CESSNA PASSED BELOW OUR NOSE AT LESS THAN 300 FT VERT SEPARATION AND LESS THAN 1 MI HORIZLY. WE RPTED OUR EVASIVE ACTION TO ZBW AND RETURNED TO OUR ASSIGNED ALT WHEN CLR OF THE CONFLICT.
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.