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1 medium large transport took off from runway 19L without clearance while another medium large transport took off from runway 25R with proper clearance. A very close conflict resulted.
| Attributes | |
| ACN | 267883 |
| Time | |
| Date | 199404 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : las |
| State Reference | NV |
| Altitude | agl bound lower : 800 agl bound upper : 1000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : las |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : initial |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : initial |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 10000 flight time type : 700 |
| ASRS Report | 267883 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 600 vertical : 50 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were given instructions to taxi into position and hold by the tower controller. After approximately 15 to 20 seconds, we were given 'maintain runway heading, climb to 7000 ft' and what we understood was a clearance for takeoff. We then proceeded with the takeoff and after becoming airborne noticed a B-737 climbing out on runway 25R. We made a right turn to the west to avoid the other aircraft's departure track, at which time we were told to turn right by the tower controller. She also advised us that we were not given a takeoff clearance. The flight proceeded to san diego normally. Supplemental information from acn 267879: we were climbing out on departure from (runway 25R) las to sfo when our TCASII alert sounded at approximately 600 AGL. I was flying in the right seat and scanned out the right side window where the intruder (TCASII) should have been. I saw a 737 approximately 300 yards away climbing out on a runway 19L takeoff coming directly at us. Tower said something to the effect that 'air carrier X, you are not cleared for takeoff.' I immediately rolled left into a 45-50 degree bank away from air carrier X and I believe he began a right turn evasive action at the same time. We were at about 800-1000 ft AGL when I broke left. I believe that ATC could have been much more aggressive in giving collision avoidance guidance sooner to us and air carrier X. Also, after we had been cleared for takeoff and departed I heard a couple other xmissions between the air carrier X 737 and ATC that may have confused the air carrier X crew. I was busy with the takeoff procedures at the time and don't remember exactly what was said. Supplemental information from acn 268219: the other B737 had apparently taken our clearance for takeoff as his and took off on runway 19.
Original NASA ASRS Text
Title: 1 MLG TOOK OFF FROM RWY 19L WITHOUT CLRNC WHILE ANOTHER MLG TOOK OFF FROM RWY 25R WITH PROPER CLRNC. A VERY CLOSE CONFLICT RESULTED.
Narrative: WE WERE GIVEN INSTRUCTIONS TO TAXI INTO POS AND HOLD BY THE TWR CTLR. AFTER APPROX 15 TO 20 SECONDS, WE WERE GIVEN 'MAINTAIN RWY HDG, CLB TO 7000 FT' AND WHAT WE UNDERSTOOD WAS A CLRNC FOR TKOF. WE THEN PROCEEDED WITH THE TKOF AND AFTER BECOMING AIRBORNE NOTICED A B-737 CLBING OUT ON RWY 25R. WE MADE A R TURN TO THE W TO AVOID THE OTHER ACFT'S DEP TRACK, AT WHICH TIME WE WERE TOLD TO TURN R BY THE TWR CTLR. SHE ALSO ADVISED US THAT WE WERE NOT GIVEN A TKOF CLRNC. THE FLT PROCEEDED TO SAN DIEGO NORMALLY. SUPPLEMENTAL INFO FROM ACN 267879: WE WERE CLBING OUT ON DEP FROM (RWY 25R) LAS TO SFO WHEN OUR TCASII ALERT SOUNDED AT APPROX 600 AGL. I WAS FLYING IN THE R SEAT AND SCANNED OUT THE R SIDE WINDOW WHERE THE INTRUDER (TCASII) SHOULD HAVE BEEN. I SAW A 737 APPROX 300 YARDS AWAY CLBING OUT ON A RWY 19L TKOF COMING DIRECTLY AT US. TWR SAID SOMETHING TO THE EFFECT THAT 'ACR X, YOU ARE NOT CLRED FOR TKOF.' I IMMEDIATELY ROLLED L INTO A 45-50 DEG BANK AWAY FROM ACR X AND I BELIEVE HE BEGAN A R TURN EVASIVE ACTION AT THE SAME TIME. WE WERE AT ABOUT 800-1000 FT AGL WHEN I BROKE L. I BELIEVE THAT ATC COULD HAVE BEEN MUCH MORE AGGRESSIVE IN GIVING COLLISION AVOIDANCE GUIDANCE SOONER TO US AND ACR X. ALSO, AFTER WE HAD BEEN CLRED FOR TKOF AND DEPARTED I HEARD A COUPLE OTHER XMISSIONS BTWN THE ACR X 737 AND ATC THAT MAY HAVE CONFUSED THE ACR X CREW. I WAS BUSY WITH THE TKOF PROCS AT THE TIME AND DON'T REMEMBER EXACTLY WHAT WAS SAID. SUPPLEMENTAL INFO FROM ACN 268219: THE OTHER B737 HAD APPARENTLY TAKEN OUR CLRNC FOR TKOF AS HIS AND TOOK OFF ON RWY 19.
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.