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Air carrier X climb through occupied altitude had less than standard separation from cpr Y. System error.
| Attributes | |
| ACN | 245617 |
| Time | |
| Date | 199307 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bos |
| State Reference | MA |
| Altitude | msl bound lower : 4300 msl bound upper : 4300 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors enroute airway : bos |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 9000 flight time type : 2000 |
| ASRS Report | 245617 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 3500 flight time type : 1100 |
| ASRS Report | 245473 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 2000 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X climbing to our assigned altitude of 5000 ft, passing 4000 ft, the boston approach controller (118.25) gave us a turn from 030 degrees to 090 degrees, which my first officer (PF) complied with. Exiting a cloud at 4300 ft, I saw cpr Y pass by our aircraft less than 1/2 mi horizontal and approximately 200 ft above our altitude. Cpr Y was also on an IFR flight and under control of the same ATC sector. If we had delayed our response to the turn or had been slower in the roll rate, I estimate we would have required a drastic evasive maneuver to avoid the cpr Y. The controller never used the word 'immediate' in giving us our heading change or to cpr Y, which in my experience should have been given considering the closeness of the traffic. Also, an immediate altitude change should have been given.
Original NASA ASRS Text
Title: ACR X CLB THROUGH OCCUPIED ALT HAD LTSS FROM CPR Y. SYS ERROR.
Narrative: ACR X CLBING TO OUR ASSIGNED ALT OF 5000 FT, PASSING 4000 FT, THE BOSTON APCH CTLR (118.25) GAVE US A TURN FROM 030 DEGS TO 090 DEGS, WHICH MY FO (PF) COMPLIED WITH. EXITING A CLOUD AT 4300 FT, I SAW CPR Y PASS BY OUR ACFT LESS THAN 1/2 MI HORIZ AND APPROX 200 FT ABOVE OUR ALT. CPR Y WAS ALSO ON AN IFR FLT AND UNDER CTL OF THE SAME ATC SECTOR. IF WE HAD DELAYED OUR RESPONSE TO THE TURN OR HAD BEEN SLOWER IN THE ROLL RATE, I ESTIMATE WE WOULD HAVE REQUIRED A DRASTIC EVASIVE MANEUVER TO AVOID THE CPR Y. THE CTLR NEVER USED THE WORD 'IMMEDIATE' IN GIVING US OUR HDG CHANGE OR TO CPR Y, WHICH IN MY EXPERIENCE SHOULD HAVE BEEN GIVEN CONSIDERING THE CLOSENESS OF THE TFC. ALSO, AN IMMEDIATE ALT CHANGE SHOULD HAVE BEEN GIVEN.
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.