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B737 departing runway 1R described conflict when traffic departing parallel runway drifted towards departure path; questioning simultaneous departure procedure.
| Attributes | |
| ACN | 809086 |
| Time | |
| Date | 200810 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sfo.airport |
| State Reference | CA |
| Altitude | agl single value : 500 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : sfo.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 240 flight time total : 13000 flight time type : 3500 |
| ASRS Report | 809086 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne critical other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Miss Distance | horizontal : 600 vertical : 100 |
| Supplementary | |
| Problem Areas | Environmental Factor |
| Primary Problem | Environmental Factor |
Narrative:
We were taking off on runway 1R. A B737 was given his takeoff clearance from runway 1L a good 20 seconds before us; but had delayed his roll for some reason. We wound up departing about 100-200 yards behind him. There was a significant west wind gusting over 20 KTS. When we rotated; he filled the left half of our windscreen. He was ahead of us by 200 or so yards and above us by 100 ft or so. The crosswind had drifted him into our path before he commenced his turn left on his SID and before we commenced our turn to 030 degrees. We gently lowered the nose and started our turn away; and did not say anything to the tower. Had this been low ceiling or visibility; the outcome could have been disastrous. Now the questions: can the tower depart aircraft simultaneously on the ones; or is there a required stagger? If they can simultaneously do this; is there a ceiling or visibility minimum required? Is the crosswind (either way) ever considered in these simultaneous takeoffs?
Original NASA ASRS Text
Title: B737 DEPARTING RUNWAY 1R DESCRIBED CONFLICT WHEN TRAFFIC DEPARTING PARALLEL RUNWAY DRIFTED TOWARDS DEPARTURE PATH; QUESTIONING SIMULTANEOUS DEPARTURE PROCEDURE.
Narrative: WE WERE TAKING OFF ON RWY 1R. A B737 WAS GIVEN HIS TKOF CLRNC FROM RWY 1L A GOOD 20 SECONDS BEFORE US; BUT HAD DELAYED HIS ROLL FOR SOME REASON. WE WOUND UP DEPARTING ABOUT 100-200 YARDS BEHIND HIM. THERE WAS A SIGNIFICANT W WIND GUSTING OVER 20 KTS. WHEN WE ROTATED; HE FILLED THE L HALF OF OUR WINDSCREEN. HE WAS AHEAD OF US BY 200 OR SO YARDS AND ABOVE US BY 100 FT OR SO. THE XWIND HAD DRIFTED HIM INTO OUR PATH BEFORE HE COMMENCED HIS TURN L ON HIS SID AND BEFORE WE COMMENCED OUR TURN TO 030 DEGS. WE GENTLY LOWERED THE NOSE AND STARTED OUR TURN AWAY; AND DID NOT SAY ANYTHING TO THE TWR. HAD THIS BEEN LOW CEILING OR VISIBILITY; THE OUTCOME COULD HAVE BEEN DISASTROUS. NOW THE QUESTIONS: CAN THE TWR DEPART ACFT SIMULTANEOUSLY ON THE ONES; OR IS THERE A REQUIRED STAGGER? IF THEY CAN SIMULTANEOUSLY DO THIS; IS THERE A CEILING OR VISIBILITY MINIMUM REQUIRED? IS THE XWIND (EITHER WAY) EVER CONSIDERED IN THESE SIMULTANEOUS TKOFS?
Data retrieved from NASA's ASRS site as of May 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.