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A B737 crew, departing cancun (mmun), mexico, were told by departure control they had not been cleared for takeoff.
| Attributes | |
| ACN | 534013 |
| Time | |
| Date | 200012 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mmun.airport |
| State Reference | FO |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : takeoff roll |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : mmun.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 534013 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | incursion : runway non adherence : clearance non adherence : published procedure non adherence : far other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : reviewed incident with flight crew other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Intra Facility Coordination Failure |
Narrative:
Normal start, taxi. Advised cun tower we were ready for takeoff. Cun tower cleared us for takeoff. We asked 'what was our takeoff altitude restr?' as we had no other altitude guidance other than FL350 from our clearance and there is usually an intermediate altitude on takeoff from cun. Tower did not give us any altitude restr and cleared us for a second time to take off. Normal takeoff until contacting departure control. They advised us that cun tower claimed that we took off without clearance. Tried to contact cun tower. Could hear him talk to several aircraft, but he would not answer us even when another carrier's pilot advised him that air carrier X was trying to contact him. He finally told us to stand by. We contacted cun operations to see if they could ascertain what the problem was. They shortly returned our call saying that cun tower said it was no problem. Consensus of flight crew is that a controller was ground controller and also the one who cleared us for takeoff both times. The controller who claimed we took off without clearance was a different controller. Believe there was a bad handoff of duties in the tower at the time we were cleared for takeoff. We were cleared for takeoff 2 times.
Original NASA ASRS Text
Title: A B737 CREW, DEPARTING CANCUN (MMUN), MEXICO, WERE TOLD BY DEP CTL THEY HAD NOT BEEN CLRED FOR TKOF.
Narrative: NORMAL START, TAXI. ADVISED CUN TWR WE WERE READY FOR TKOF. CUN TWR CLRED US FOR TKOF. WE ASKED 'WHAT WAS OUR TKOF ALT RESTR?' AS WE HAD NO OTHER ALT GUIDANCE OTHER THAN FL350 FROM OUR CLRNC AND THERE IS USUALLY AN INTERMEDIATE ALT ON TKOF FROM CUN. TWR DID NOT GIVE US ANY ALT RESTR AND CLRED US FOR A SECOND TIME TO TAKE OFF. NORMAL TKOF UNTIL CONTACTING DEP CTL. THEY ADVISED US THAT CUN TWR CLAIMED THAT WE TOOK OFF WITHOUT CLRNC. TRIED TO CONTACT CUN TWR. COULD HEAR HIM TALK TO SEVERAL ACFT, BUT HE WOULD NOT ANSWER US EVEN WHEN ANOTHER CARRIER'S PLT ADVISED HIM THAT ACR X WAS TRYING TO CONTACT HIM. HE FINALLY TOLD US TO STAND BY. WE CONTACTED CUN OPS TO SEE IF THEY COULD ASCERTAIN WHAT THE PROB WAS. THEY SHORTLY RETURNED OUR CALL SAYING THAT CUN TWR SAID IT WAS NO PROB. CONSENSUS OF FLC IS THAT A CTLR WAS GND CTLR AND ALSO THE ONE WHO CLRED US FOR TKOF BOTH TIMES. THE CTLR WHO CLAIMED WE TOOK OFF WITHOUT CLRNC WAS A DIFFERENT CTLR. BELIEVE THERE WAS A BAD HDOF OF DUTIES IN THE TWR AT THE TIME WE WERE CLRED FOR TKOF. WE WERE CLRED FOR TKOF 2 TIMES.
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.