2.1.5.Following the exposure period prescribed in paragraph 2.1.4, an even layer of ice of 0,044 g/cm2 shall be applied over the entire outside surface of the windscreen by means of a water spray gun working at 3,5 ± 0,2 bar operating pressure.
2.1.5.1.The spray nozzle, adjusted to full fan pattern and maximum flow, shall be held perpendicular to and at a distance of between 200 and 250 mm from the glazed surface, and so directed as to form an even layer of ice right across the windscreen from one side to the other.
2.1.5.1.1.A spray gun having a nozzle of 1,7 mm diameter and a liquid flow rate of 0,395 l/min, and capable of producing a fan pattern of 300 mm diameter on the glazed surface at a distance 200 mm from that surface, may be used to satisfy the requirements of paragraph 2.1.5. Any other device by which the requirements can be satisfied shall also be permitted.
2.1.7.After the period prescribed in paragraph 2.1.6 has elapsed, one or two observers shall enter the vehicle, subsequently the vehicle master operation control may be switched to the on position and any engine can be started, if necessary by some external means. The test period shall commence as soon as the vehicle master control switch has been activated.
2.1.7.1.If the vehicle is fitted with an engine, the engine speeds may be adjusted according to manufacturer’s specification recommended for warming up when starting in cold weather, during the first five minutes of the test period.
2.1.7.2.During the final 35 minutes of the test period (or during the entire test period if the five-minute warming-up procedure is not followed):
2.1.7.2.1.The engine, if fitted, shall run at a speed not exceeding 50 % of the speed corresponding to its maximum power output. However, if this is proven not to be practicable due to specific engine control strategies, for instance in the case of electric hybrid vehicles, a realistic worst case scenario shall be determined. The scenario shall take into account the engine speeds, periodical absence or complete absence of a running engine during normal driving conditions at an ambient temperature of – 8 °C or – 18 °C, whichever has been selected by the manufacturer as the designated test temperature. If the system can meet the defrosting requirements without a running engine, the engine does not have to run at all.
2.1.7.3.All batteries shall be fully charged at the start of the test.
2.1.7.4.. . . . . . . . . . . . . . . . . . . .
2.1.7.5.The temperature in the test chamber shall be measured at the level of the ... windscreen, at a point not significantly affected by heat from the vehicle under test.
2.1.7.6.The horizontal component of the speed of the air cooling the chamber, measured immediately prior to the test, in the median plane of the vehicle at a point 300 mm forward of the base of the windscreen and at a level half-way between the base and the top of the windscreen, shall be as low as possible and in any event less than 8 km/h.
2.1.7.7.If fitted, the engine bonnet, roof, all doors, windows and vents, except the intakes and outlets of the heating and ventilating system, shall be closed; one or two windows may be opened for a total vertical distance of 25 mm if the vehicle manufacturer so requests.
2.1.7.8.The vehicle’s defrosting system controls shall be set as recommended by the vehicle manufacturer for the test temperature.
2.1.7.9.The windscreen wipers may be used during the test, but this shall be done without any manual assistance apart from the operation of any controls in the interior of the vehicle.