FL370 Officeboy
The traffic flow management in the lower London TMA and in particular LGW & LHR won't dictate a speed of greater than 220kts. There really will not be an issue. If you've flown the Q400 you will know you can actually do about 243kts below FL80 and the only limiting factor is the windscreen bird strike limit hence that speed. As for climb performance, the Q400 in the lower levels and at the early stages of climb will climb at 3000fpm +. With the level off of instrument departures out of London airports of 3000ft to 6000ft do you really think an extra 1000fpm climb rate is that beneficial? I think there's alot of people on here trying to find a reason to slate the dash going into LHR but really, there's no major issues.
Last edited by Reversethrustset; 20th Dec 2016 at 22:32.