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B737 captain believes mia local controller is not providing legal wake turbulence separation when he refused a takeoff clearance because his TCASII showed the preceding B757 was only 2 pt 5 mi ahead.
| Attributes | |
| ACN | 628395 |
| Time | |
| Date | 200408 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mia.airport |
| State Reference | FL |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : mia.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : takeoff roll ground : holding |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : mia.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 628395 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | inflight encounter : wake turbulence non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : brite radar aircraft equipment : tcas other controllera other flight crewa other flight crewb other other : 3 |
| Resolutory Action | controller : issued new clearance controller : separated traffic controller : issued advisory |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Ambiguous |
Narrative:
Several times recently I have had to decline takeoff clrncs from mia tower after not being given legal wake turbulence separation. I mentioned this to the copilot this sequence just before taking the runway following a company B757. The controller then cleared us for takeoff when TCASII showed the preceding aircraft to be 2.5 mi ahead. I refused the clearance. On one previous occasion, when I refused, tower said that we would have the required distance eventually, once we were airborne. If this is the standard being applied, essentially giving the first aircraft a running start, then it might result in legal clearance once both airplanes are aloft, but it ignores the problem of wake turbulence on or close to the runway itself. I thought perhaps we might want to be aware if this is a trend.
Original NASA ASRS Text
Title: B737 CAPT BELIEVES MIA LCL CTLR IS NOT PROVIDING LEGAL WAKE TURB SEPARATION WHEN HE REFUSED A TKOF CLRNC BECAUSE HIS TCASII SHOWED THE PRECEDING B757 WAS ONLY 2 PT 5 MI AHEAD.
Narrative: SEVERAL TIMES RECENTLY I HAVE HAD TO DECLINE TKOF CLRNCS FROM MIA TWR AFTER NOT BEING GIVEN LEGAL WAKE TURB SEPARATION. I MENTIONED THIS TO THE COPLT THIS SEQUENCE JUST BEFORE TAKING THE RWY FOLLOWING A COMPANY B757. THE CTLR THEN CLRED US FOR TKOF WHEN TCASII SHOWED THE PRECEDING ACFT TO BE 2.5 MI AHEAD. I REFUSED THE CLRNC. ON ONE PREVIOUS OCCASION, WHEN I REFUSED, TWR SAID THAT WE WOULD HAVE THE REQUIRED DISTANCE EVENTUALLY, ONCE WE WERE AIRBORNE. IF THIS IS THE STANDARD BEING APPLIED, ESSENTIALLY GIVING THE FIRST ACFT A RUNNING START, THEN IT MIGHT RESULT IN LEGAL CLRNC ONCE BOTH AIRPLANES ARE ALOFT, BUT IT IGNORES THE PROB OF WAKE TURB ON OR CLOSE TO THE RWY ITSELF. I THOUGHT PERHAPS WE MIGHT WANT TO BE AWARE IF THIS IS A TREND.
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.