Purpose: The purpose of this SAE Aerospace Recommended Practice (ARP) is to provide the sample selection and endurance time test procedures@ for SAE Type II@ III@ and IV aircraft deicing/anti-icing fluids@ required for the generation of endurance time data of acceptable quality for review by the SAE G-12 Holdover Time Subcommittee. Examination of Endurance Time Data: Periodically@ the SAE G-12 Holdover Time Subcommittee examines endurance time test data of aircraft deicing/anti-icing fluids SAE Type II@ III@ and IV and validates@ based on the endurance time data@ if such fluids can be used in conjunction with SAE Type II@ III@ or IV fluid holdover time guidelines. As the SAE G-12 Holdover Time Subcommittee examines endurance time data@ it will take into consideration the effects of natural variability of precipitation both in time and space to generate or adjust holdover time guidelines. Limits: This ARP provides laboratory simulation of freezing fog@ freezing drizzle@ light freezing rain and rain on cold soaked wing. It also describes test conditions for outside natural snow tests. Other forms of freezing/frozen precipitation are not addressed in this ARP. Testing Agent(s): Independence of Testing Agents: A testing agent shall be independent of the fluid manufacturer or fluid vendor. Role of the Testing Agent: The testing agent shall coordinate activities related to the sample selection procedures (Section 3). Sending Samples: Fluid samples for testing shall be sent to a testing agent for verification under the sample selection procedures. In turn the testing agent@ if the requirements of the applicable sample selection procedure are fulfilled@ shall send the samples to the facility/site for endurance time testing. Test Facility/Site: Independence of the Test Facilities/Sites: The test facilities/sites shall be independent of the fluid manufacturer or fluid vendor. Role of the Test Facility/Site: The test facilities/sites shall be responsible for performing the endurance time tests (Sections 4 to 11). Units: The values stated in SI units are to be regarded as the standard. Safety: While the materials@ methods@ applications@ and processes described or referenced in this ARP may involve the use of hazardous materials@ this ARP does not address the hazards that may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and processes and to take necessary precautionary measures to ensure the health and safety of all personnel involved.