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Less than standard separation when inbound widebody transport issued descent clearance through departure medium large transport altitude.
| Attributes | |
| ACN | 98400 |
| Time | |
| Date | 198811 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bos |
| State Reference | MA |
| Altitude | msl bound lower : 4200 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bos |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : takeoff climbout : intermediate altitude |
| Route In Use | departure sid : sid enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 125 flight time total : 13000 flight time type : 2500 |
| ASRS Report | 98400 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 500 vertical : 100 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Departure clearance logan 6 maintain 5000'. After takeoff switched to departure on 127.2. The controller did not acknowledge our call. Gave heading instructions to a heavy and another aircraft. Before we could contact departure again we determined the inbound flight and our flight would occupy the same airspace. I leveled the aircraft at 4200' and reduced power. The inbound flight passed just in front of our aircraft. The arriving flight had been issued a descent clearance below our assigned 5000' and was to maintain visual sep with our aircraft. We were not advised of the traffic by the tower and due to the congestion on the departure frequency the conflict had passed by the time we called departure a second time.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION WHEN INBOUND WDB ISSUED DESCENT CLRNC THROUGH DEP MLG ALT.
Narrative: DEP CLRNC LOGAN 6 MAINTAIN 5000'. AFTER TKOF SWITCHED TO DEP ON 127.2. THE CTLR DID NOT ACKNOWLEDGE OUR CALL. GAVE HDG INSTRUCTIONS TO A HEAVY AND ANOTHER ACFT. BEFORE WE COULD CONTACT DEP AGAIN WE DETERMINED THE INBND FLT AND OUR FLT WOULD OCCUPY THE SAME AIRSPACE. I LEVELED THE ACFT AT 4200' AND REDUCED PWR. THE INBND FLT PASSED JUST IN FRONT OF OUR ACFT. THE ARRIVING FLT HAD BEEN ISSUED A DSCNT CLRNC BELOW OUR ASSIGNED 5000' AND WAS TO MAINTAIN VISUAL SEP WITH OUR ACFT. WE WERE NOT ADVISED OF THE TFC BY THE TWR AND DUE TO THE CONGESTION ON THE DEP FREQ THE CONFLICT HAD PASSED BY THE TIME WE CALLED DEP A SECOND TIME.
Data retrieved from NASA's ASRS site as of August 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.