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A potential conflict ensues when ZBW issues a visual climb to a B737-500. The B737 starts its climb after the crew of an MD80 on a collision course at 15000 ft asks ZBW to stop that climb. Both aircraft perform opposite direction evasive action climb descent.
| Attributes | |
| ACN | 416430 |
| Time | |
| Date | 199810 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bdl |
| State Reference | CT |
| Altitude | msl bound lower : 15000 msl bound upper : 15400 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zbw |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 11000 flight time type : 1100 |
| ASRS Report | 416430 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 11000 flight time type : 1000 |
| ASRS Report | 416122 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : far non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
While en route from bos to ewr, our MD80 leveled off at 15000 ft. We were advised of traffic (B737) at 10-11 O'clock at 14000 ft. We spotted the traffic, but did not call traffic in sight before ZBW gave the B737 a climb to FL230. The captain and I realized that this was not going to work and before the TCASII gave us an alert we started a climb at the same time the TCASII alert turned into a red RA with a climb instruction. We had already climbed about 400 ft. I also made a radio call to center telling them that the B737 needed to stop their climb (no response). The B737 reported they also got an RA and stopped their climb and started down. The last time I saw the TCASII it showed an RA -300 ft. I never reported the traffic in sight nor did I hear ZBW issue a visual climb clearance to the B737. Supplemental information from acn 416122: ZBW asked the B737 if he had the MD80 in sight visually and the B737 responded affirmative. ZBW cleared the B737 for FL230.
Original NASA ASRS Text
Title: A POTENTIAL CONFLICT ENSUES WHEN ZBW ISSUES A VISUAL CLB TO A B737-500. THE B737 STARTS ITS CLB AFTER THE CREW OF AN MD80 ON A COLLISION COURSE AT 15000 FT ASKS ZBW TO STOP THAT CLB. BOTH ACFT PERFORM OPPOSITE DIRECTION EVASIVE ACTION CLB DSCNT.
Narrative: WHILE ENRTE FROM BOS TO EWR, OUR MD80 LEVELED OFF AT 15000 FT. WE WERE ADVISED OF TFC (B737) AT 10-11 O'CLOCK AT 14000 FT. WE SPOTTED THE TFC, BUT DID NOT CALL TFC IN SIGHT BEFORE ZBW GAVE THE B737 A CLB TO FL230. THE CAPT AND I REALIZED THAT THIS WAS NOT GOING TO WORK AND BEFORE THE TCASII GAVE US AN ALERT WE STARTED A CLB AT THE SAME TIME THE TCASII ALERT TURNED INTO A RED RA WITH A CLB INSTRUCTION. WE HAD ALREADY CLBED ABOUT 400 FT. I ALSO MADE A RADIO CALL TO CTR TELLING THEM THAT THE B737 NEEDED TO STOP THEIR CLB (NO RESPONSE). THE B737 RPTED THEY ALSO GOT AN RA AND STOPPED THEIR CLB AND STARTED DOWN. THE LAST TIME I SAW THE TCASII IT SHOWED AN RA -300 FT. I NEVER RPTED THE TFC IN SIGHT NOR DID I HEAR ZBW ISSUE A VISUAL CLB CLRNC TO THE B737. SUPPLEMENTAL INFO FROM ACN 416122: ZBW ASKED THE B737 IF HE HAD THE MD80 IN SIGHT VISUALLY AND THE B737 RESPONDED AFFIRMATIVE. ZBW CLRED THE B737 FOR FL230.
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.