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Unauthorized takeoff performed by air carrier medium large transport as crew accepts takeoff clearance for another aircraft.
| Attributes | |
| ACN | 253264 |
| Time | |
| Date | 199310 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : san |
| State Reference | CA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : takeoff ground : holding |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 270 flight time total : 17500 flight time type : 12000 |
| ASRS Report | 253264 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | incursion : runway non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft was holding #1 for takeoff at san runway 27, south side. This taxi area is wide enough for 2 medium large transport type aircraft to taxi onto the runway without obstructing one another. Our aircraft was at far east side of runup area. We heard tower give an aircraft immediate takeoff clearance for what we thought was our flight. The very first part of the transmission was 'covered' by another transmission. We slowly and clearly repeated our flight number and acknowledged 'cleared for takeoff.' after liftoff as we were handed off to departure control, tower advised us that we had accepted takeoff clearance for another aircraft. Evidently the commuter turboprop beside and behind us was cleared first for takeoff. Because part of the transmission was 'covered up' we should have double-checked to determine if the clearance was for us. Unfortunately, we are human.
Original NASA ASRS Text
Title: UNAUTH TKOF PERFORMED BY ACR MLG AS CREW ACCEPTS TKOF CLRNC FOR ANOTHER ACFT.
Narrative: ACFT WAS HOLDING #1 FOR TKOF AT SAN RWY 27, S SIDE. THIS TAXI AREA IS WIDE ENOUGH FOR 2 MLG TYPE ACFT TO TAXI ONTO THE RWY WITHOUT OBSTRUCTING ONE ANOTHER. OUR ACFT WAS AT FAR E SIDE OF RUNUP AREA. WE HEARD TWR GIVE AN ACFT IMMEDIATE TKOF CLRNC FOR WHAT WE THOUGHT WAS OUR FLT. THE VERY FIRST PART OF THE XMISSION WAS 'COVERED' BY ANOTHER XMISSION. WE SLOWLY AND CLRLY REPEATED OUR FLT NUMBER AND ACKNOWLEDGED 'CLRED FOR TKOF.' AFTER LIFTOFF AS WE WERE HANDED OFF TO DEP CTL, TWR ADVISED US THAT WE HAD ACCEPTED TKOF CLRNC FOR ANOTHER ACFT. EVIDENTLY THE COMMUTER TURBOPROP BESIDE AND BEHIND US WAS CLRED FIRST FOR TKOF. BECAUSE PART OF THE XMISSION WAS 'COVERED UP' WE SHOULD HAVE DOUBLE-CHKED TO DETERMINE IF THE CLRNC WAS FOR US. UNFORTUNATELY, WE ARE HUMAN.
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.