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Air carrier captain reported ATC cleared them for takeoff prior to sufficient wake turbulence separation from a preceding departure.
| Attributes | |
| ACN | 1588821 |
| Time | |
| Date | 201810 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | MD-11 |
| Flight Phase | Takeoff |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | ATC Issue All Types |
Narrative:
An md-11 was cleared for takeoff. I punched the clock for the 90 second separation for wake turbulence. We were cleared into position with line up and wait. I taxied into position. As soon as I was in position; we were cleared for takeoff. I looked at my clock and only 45 seconds had gone by since the md-11 took off. We told tower that we needed at least 30 more seconds. The controller canceled our takeoff clearance and stated that by radar we had enough separation. We stated no; we need more time. We were then cleared for takeoff. I was astonished they were going by radar separation verses time. That is really an unsafe condition for aircraft behind a heavy taking off.
Original NASA ASRS Text
Title: Air Carrier Captain reported ATC cleared them for takeoff prior to sufficient wake turbulence separation from a preceding departure.
Narrative: An MD-11 was cleared for takeoff. I punched the clock for the 90 second separation for wake turbulence. We were cleared into position with Line up and Wait. I taxied into position. As soon as I was in position; we were cleared for takeoff. I looked at my clock and only 45 seconds had gone by since the MD-11 took off. We told tower that we needed at least 30 more seconds. The controller canceled our takeoff clearance and stated that by radar we had enough separation. We stated no; we need more time. We were then cleared for takeoff. I was astonished they were going by radar separation verses time. That is really an unsafe condition for aircraft behind a heavy taking off.
Data retrieved from NASA's ASRS site 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.