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LR35 departure from bos activates TCAS event with air carrier after controller utilizes visual separation from application procedure.
| Attributes | |
| ACN | 669928 |
| Time | |
| Date | 200508 |
| Place | |
| Locale Reference | airport : bos.airport |
| State Reference | MA |
| Altitude | msl single value : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : a90.tracon |
| Operator | common carrier : air taxi |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | climbout : initial climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : a90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 16390 flight time type : 3900 |
| ASRS Report | 669928 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne critical |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Miss Distance | horizontal : 500 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Ambiguous |
Narrative:
Departed runway 15R bos. Performed departure turn to 120 degree heading and climbing to 5000 ft. Checked on with bos departure and was assigned a heading of 060 degrees and climb to 6000 ft. Started to climb when ATC said to go back down to 5000 ft. At 5300 ft returned to 5000 ft and kept airspeed to 210 KTS or less. Bos called us out to air carrier Y and they saw us. We acknowledged seeing them. Both myself and copilot had air carrier in sight. We were then told to continue climb to 14000 ft on 060 degree heading. At that point we continued climb with aircraft in sight. At all times; we had the aircraft in sight and we began to accelerate and climb past him and avoided his path. When air carrier passed above and behind us; we were 500 ft below him and 500+ ft past him laterally. If after given the instructions to climb we started to accelerate and climb quickly to get to altitude; maybe that set off TCAS in air carrier's airplane?
Original NASA ASRS Text
Title: LR35 DEP FROM BOS ACTIVATES TCAS EVENT WITH ACR AFTER CTLR UTILIZES VISUAL SEPARATION FROM APPLICATION PROC.
Narrative: DEPARTED RWY 15R BOS. PERFORMED DEP TURN TO 120 DEG HDG AND CLBING TO 5000 FT. CHKED ON WITH BOS DEP AND WAS ASSIGNED A HDG OF 060 DEGS AND CLB TO 6000 FT. STARTED TO CLB WHEN ATC SAID TO GO BACK DOWN TO 5000 FT. AT 5300 FT RETURNED TO 5000 FT AND KEPT AIRSPD TO 210 KTS OR LESS. BOS CALLED US OUT TO ACR Y AND THEY SAW US. WE ACKNOWLEDGED SEEING THEM. BOTH MYSELF AND COPLT HAD ACR IN SIGHT. WE WERE THEN TOLD TO CONTINUE CLB TO 14000 FT ON 060 DEG HDG. AT THAT POINT WE CONTINUED CLB WITH ACFT IN SIGHT. AT ALL TIMES; WE HAD THE ACFT IN SIGHT AND WE BEGAN TO ACCELERATE AND CLB PAST HIM AND AVOIDED HIS PATH. WHEN ACR PASSED ABOVE AND BEHIND US; WE WERE 500 FT BELOW HIM AND 500+ FT PAST HIM LATERALLY. IF AFTER GIVEN THE INSTRUCTIONS TO CLB WE STARTED TO ACCELERATE AND CLB QUICKLY TO GET TO ALT; MAYBE THAT SET OFF TCAS IN ACR'S AIRPLANE?
Data retrieved from NASA's ASRS site as of January 2009 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.