Parallel Take-offs LHR ?
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Parallel Take-offs LHR ?
This evening at 19.00 I watched a PIA 777 float past coming out of LHR and then almost immediately (15secs) another 777 (Turkish ?) floated by. From my perspective they might have come off the same runway, but that is highly unlikely. So my question is, I'm aware of parallel landings at LHR, like when an A380 lands, often an A320 might parallel land to avoid the wake turbulence (assuming traffic flow allows), but I've never seen a parallel takeoff in many years of looking to the London skies, are they rare ?
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When I was there it was fairly unusual but not rare. Typically, 27L for take-off..northbound BA short haul leaves (what were) the A or B gates. After quick consultation between the Air Men, the short haul is offered a quickie from 27R. Usually gratefully received! Wonder if it still happens?
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FR24 seems to show them both coming off 09R, maybe 3 miles apart.
WebTrak also shows them both airborne from 09R just under a minute apart.
Although they were presumably both on a DET1J departure, the PIA appears to have been vectored south of the SID and the THY to the north of it, no doubt to ensure separation.
Although they were presumably both on a DET1J departure, the PIA appears to have been vectored south of the SID and the THY to the north of it, no doubt to ensure separation.
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That's interesting that they both launched off 09L. As said above the PIA was slightly south of the normal and the THY slightly north. Perhaps it was that the THY was going a bit faster and was 'catching up' with the PIA 777, because from my viewpoint the time gap from one to the other passing was very short. On reflection, no more than 30secs, perhaps less. Visually, it was very out of the ordinary. A friend says he remembers 2 VC-137's coming out of LHR almost simultaneously back in the early 1970's during a presidential visit.
Although they were a minute apart over Hatton Cross, the PIA didn't accelerate appreciably and by the time they were over Richmond Park, the THY was only about 30 seconds behind it and travelling 50 kts faster, hence the subsequent vectoring by ATC.
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Much difference in rate of climb Dave?
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Don't call me Dave ;-) , but from my perspective (0ft) it seemed that the PIA was a good bit higher once they went their separated ways from the SID.
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It is exceptionally difficult to achieve one minute between heavies on different routes but if these two were on the same SID the min separation would be 2 minutes anyway. Why PK786 was only doing that speed I don't know.
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Heathrow do not use 09L for departures unless extreme circumstances. Nor do they ever have parallel departures. They occasionally have parallel arrivals in the busy spot after 6 am. If it looks like there are parallel departures it is more likely to be a goaround or rejected landing from the other runway.
They occasionally have parallel arrivals in the busy spot after 6 am.
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I'm aware of the old O'Hare layout, but stand by my comment that they wouldn't have been able to launch 6 heavies in one minute. Mediums taking VFR departure separation, sure. But not heavies. Even with the current parallel runway configuration and arrivals they'd be hard pressed to launch 6 heavies in one minute.
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Even then, there were only a few dozen over a 5-month period (though the official stats reported more than actually occurred) and the measure wasn't included in the later Phase II trials.
"Tactically Enhanced Departures" (aka "TED"), as they are officially referred to, would of course be an everyday occurrence if and when R3 is built.
