A question for our US airspace experts (if I may):
FAR91.117 Aircraft Speed states in para(a) 'Unless authorized by the Administrator, no person may operate an aircraft below 10,000 feet MSL at an indicated airspeed of more than 250 knots (288 m. p. h.).'
Para (d) states 'If the minimum safe airspeed for any particular operation is greater than the maximum speed prescribed in this section, the aircraft may be operated at that minimum speed.'
As others have already stated many of the 'heavies' at high weights will have a min clean above 250kt. Can therefore para (d) be applied - are min safe & min clean synonymous in this context - or should I be climbing with Flap 1 to 10,000ft?