 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Small transport Y landed over air carrier X crossing runway with less than standard separation. Near midair collision. System error. Pilot deviation.
| Attributes | |
| ACN | 178543 |
| Time | |
| Date | 199104 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : bos |
| State Reference | MA |
| Altitude | agl bound lower : 0 agl bound upper : 20 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | ground other : taxi |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | landing other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 178543 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : ground critical conflict : nmac non adherence : far non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 20 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
Bos ground instructed outer taxiway, sierra, hold short of runway 4L, runway 9 for takeoff. Holding short cleared to tower frequency for runway 4L. On tower frequency we were cleared to cross runway 4L hold short of runway 9. We observed an aircraft several mi out for runway 4R. With the power up and starting to enter runway 4L, it became apparent that instead of a large aircraft several mi out we had a small small transport Y close in and lined up for runway 4L. At that point I was committed to the crossing and applied almost takeoff thrust in attempt to clear the runway from view overhead as the cockpit xed the runway edge clearing onto taxiway sierra. It is my understanding that small transport Y completed the landing. Except for the illusion created by the angle of sierra to runway 4 and large aircraft far out versus small aircraft close in, I would have never accepted the crossing clearance.
Original NASA ASRS Text
Title: SMT Y LANDED OVER ACR X CROSSING RWY WITH LESS THAN STANDARD SEPARATION. NMAC. SYSTEM ERROR. PLTDEV.
Narrative: BOS GND INSTRUCTED OUTER TXWY, SIERRA, HOLD SHORT OF RWY 4L, RWY 9 FOR TKOF. HOLDING SHORT CLRED TO TWR FREQ FOR RWY 4L. ON TWR FREQ WE WERE CLRED TO CROSS RWY 4L HOLD SHORT OF RWY 9. WE OBSERVED AN ACFT SEVERAL MI OUT FOR RWY 4R. WITH THE PWR UP AND STARTING TO ENTER RWY 4L, IT BECAME APPARENT THAT INSTEAD OF A LARGE ACFT SEVERAL MI OUT WE HAD A SMALL SMT Y CLOSE IN AND LINED UP FOR RWY 4L. AT THAT POINT I WAS COMMITTED TO THE XING AND APPLIED ALMOST TKOF THRUST IN ATTEMPT TO CLR THE RWY FROM VIEW OVERHEAD AS THE COCKPIT XED THE RWY EDGE CLRING ONTO TXWY SIERRA. IT IS MY UNDERSTANDING THAT SMT Y COMPLETED THE LNDG. EXCEPT FOR THE ILLUSION CREATED BY THE ANGLE OF SIERRA TO RWY 4 AND LARGE ACFT FAR OUT VERSUS SMALL ACFT CLOSE IN, I WOULD HAVE NEVER ACCEPTED THE XING CLRNC.
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.