The test in this British Standard is applicable to equipment installed in a forward facing location external to an aircraft or in the intake ducting where it may be subjected to the impact of supercooled water droplets or ice crystals, and where under conditions of near or sub-zero temperatures ice may form or accumulate and interfere with the safe operation of the equipment or result in the shedding of ice fragments hazardous to other equipment installed downstream.
This standard should be read in conjunction with British Standard 3G.100 : Part 0.