Regulation 21 Weight and performance of public transport helicopters classified as helicopters of performance group B in their certificate of airworthiness
For the purposes of article 30(1), a helicopter registered in the United Kingdom in respect of which there is in force under the Order a certificate of airworthiness in which the helicopter is designated as being of performance group B shall not fly for the purpose of public transport at night or out of sight of the surface or when the cloud ceiling or visibility prevailing at the departure site and forecast for the estimated time of landing at the site at which it is intended to land are less than 600 feet and 1000 metres respectively and shall not fly for the purpose of public transport at any other time unless the weight of the helicopter at the commencement of take off is such that the following conditions are satisfied—
The weight does not exceed the maximum take off weight specified for the altitude and the air temperature at the site from which the take off is to be made.
The landing weight of the helicopter will not exceed the maximum landing weight specified for the altitude and the expected air temperature for the estimated time of landing at the site at which it is intended to land and at any alternate site:
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Provided that this regulation shall not apply to a helicopter flying under and in accordance with the terms of a police air operator’s certificate.