 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Air carrier Y had less than standard wake turbulence separation from widebody transport. Multiple runway operation parallel runways. System error.
| Attributes | |
| ACN | 208969 |
| Time | |
| Date | 199204 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bos |
| State Reference | MA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 3 |
| ASRS Report | 208969 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : radar |
| Events | |
| Anomaly | non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 2000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Intra Facility Coordination Failure Operational Error |
Narrative:
Runways 4L and 4R are separated by less than 2500 ft. The runway 4L departure threshold is approximately 2000 ft north of the runway 4R threshold. The facility has designated this as a 3 min departure delay for runway 4L when heavy aircraft depart runway 4R per FAA handbook 7110.65 paragraph 3-106g. The local control position are separate for runways 4L (local west) and runway 4R (local east). Local east coordination with local west for release of a heavy widebody transport off runway 4R (due to wake turbulence). This was approved by local west. Local east then cleared air carrier Y for takeoff from runway 4L approximately 2 mins later. Diverging course separation was established upon departure of air carrier Y from runway 4L (per facility directive). Human factors: didn't think before doing.
Original NASA ASRS Text
Title: ACR Y HAD LESS THAN STANDARD WAKE TURB SEPARATION FROM WDB. MULTIPLE RWY OP PARALLEL RWYS. SYS ERROR.
Narrative: RWYS 4L AND 4R ARE SEPARATED BY LESS THAN 2500 FT. THE RWY 4L DEP THRESHOLD IS APPROX 2000 FT N OF THE RWY 4R THRESHOLD. THE FACILITY HAS DESIGNATED THIS AS A 3 MIN DEP DELAY FOR RWY 4L WHEN HVY ACFT DEPART RWY 4R PER FAA HANDBOOK 7110.65 PARAGRAPH 3-106G. THE LCL CTL POS ARE SEPARATE FOR RWYS 4L (LCL W) AND RWY 4R (LCL E). LCL E COORD WITH LCL W FOR RELEASE OF A HVY WDB OFF RWY 4R (DUE TO WAKE TURB). THIS WAS APPROVED BY LCL W. LCL E THEN CLRED ACR Y FOR TKOF FROM RWY 4L APPROX 2 MINS LATER. DIVERGING COURSE SEPARATION WAS ESTABLISHED UPON DEP OF ACR Y FROM RWY 4L (PER FACILITY DIRECTIVE). HUMAN FACTORS: DIDN'T THINK BEFORE DOING.
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.