The K-coefficient shall be measured according to the procedures in ATP, Annex 1, Appendix 2, paragraphs 1-28, and the following shall apply:
(a) The internal heating method shall be used.
(b) In ATP, Annex 1, Appendix 2, paragraph 8, last line, “about + 20 °C for the mean temperature of the walls of the body shall be interpreted to mean between +19 °C (+66 °F) and 21 °C (+70 °F).
(c) A report of each test shall be completed on a form corresponding to the pertinent test report model prescribed in ATP, Annex 1, Appendix 2. Report forms may be obtained by a request to the ATP manager.