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MD11 crew in position on the runway questions his takeoff instruction and his separation from a B747 that had departed 90 seconds earlier.
| Attributes | |
| ACN | 554854 |
| Time | |
| Date | 200207 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : anc.airport |
| State Reference | AK |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : anc.tower |
| Operator | common carrier : air carrier |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : position and hold ground : takeoff roll |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : anc.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 6000 flight time type : 1000 |
| ASRS Report | 554854 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | inflight encounter : wake turbulence non adherence : required legal separation |
| Independent Detector | other controllera other flight crewa other flight crewb other other : 4 |
| Resolutory Action | controller : separated traffic flight crew : executed go around |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
We were cleared to 'position and hold' behind a B747 taking off on runway 14 at panc. We started the stop watch for the 2 min wake turbulence separation. There was a passenger jet on 6 mi final approach to runway 14 at the time of our clearance on the runway. Once in position, the tower cleared us for takeoff with only 90 seconds elapsed time from the B747 takeoff roll. I questioned the tower about the adequate wake turbulence separation. Tower replied 'he had what he needed.' by this time we had our 2 mins and accepted the takeoff clearance. We took off without incident. However, the jet on final was told to go around by tower. To my knowledge, no loss of separation occurred with the aircraft on go around. Winds on takeoff were 130 degrees at 17 KTS gusting to 22 KTS.
Original NASA ASRS Text
Title: MD11 CREW IN POS ON THE RWY QUESTIONS HIS TKOF INSTRUCTION AND HIS SEPARATION FROM A B747 THAT HAD DEPARTED 90 SECONDS EARLIER.
Narrative: WE WERE CLRED TO 'POS AND HOLD' BEHIND A B747 TAKING OFF ON RWY 14 AT PANC. WE STARTED THE STOP WATCH FOR THE 2 MIN WAKE TURB SEPARATION. THERE WAS A PAX JET ON 6 MI FINAL APCH TO RWY 14 AT THE TIME OF OUR CLRNC ON THE RWY. ONCE IN POS, THE TWR CLRED US FOR TKOF WITH ONLY 90 SECONDS ELAPSED TIME FROM THE B747 TKOF ROLL. I QUESTIONED THE TWR ABOUT THE ADEQUATE WAKE TURB SEPARATION. TWR REPLIED 'HE HAD WHAT HE NEEDED.' BY THIS TIME WE HAD OUR 2 MINS AND ACCEPTED THE TKOF CLRNC. WE TOOK OFF WITHOUT INCIDENT. HOWEVER, THE JET ON FINAL WAS TOLD TO GO AROUND BY TWR. TO MY KNOWLEDGE, NO LOSS OF SEPARATION OCCURRED WITH THE ACFT ON GAR. WINDS ON TKOF WERE 130 DEGS AT 17 KTS GUSTING TO 22 KTS.
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.