Abstract
Fire protection performance is one of the most important capabilities for aircraft engine, since the result may be hazardous in the case of a fire condition. According to fire protection regulation CCAR 33.17 of China Civil Aviation Regulations, fire-proof tests of a specific pipeline, a fuel tank and a fuel filter assembly were carried out. Test conditions include inlet fluid temperature, fluid pressure, fluid volume flow, fire temperature and heat flux density. The average flame temperature during the fire tests is 2000 degrees Fahrenheit, the heat flux density is 116kW/m2±10kW/m2 and the distance from burner exhaust to the test area is 100mm in these fire tests. Fire test of pipe passed, but the fire test of oil tank failed because of the failure of the oil circulation system and the melting of plastic pipe material in the ventilation pipe separately. The first fire test of the fuel filter failed because of design defect of one oil drainage path, but after design change of the oil drainage path, the second one succeeded. Based on the fire protection tests and results analysis, three essential factors of fire protection performance and type certification were presented: 1. Volume of medium retained in test parts; 2. Mass flow of medium; 3. Pressure in the test parts cavity.
Highlights
Fire protection performance is a critical requirement for civil aircraft engines, an it is one of the most essential factors for basic safety requirements and airworthiness regulation compliance [1]
According to the investigation of engine fire protection regulation CCAR 33.17, which is of China Civil Aviation Regulations Part 33 Airworthiness Standards: Aircraft Engines, the design and construction of the engine and the materials used must comply with the fire protection requirements, such as the pipe and tank which contains flammable fluids
The fire-proof performance of engine parts was studied through test analysis, and three key factors affecting the fire-proof performance were summarized, which were volume of medium retained in test parts, mass flow and pressure in the test parts cavity
Summary
Fire protection performance is a critical requirement for civil aircraft engines, an it is one of the most essential factors for basic safety requirements and airworthiness regulation compliance [1]. According to the investigation of engine fire protection regulation CCAR 33.17, which is of China Civil Aviation Regulations Part 33 Airworthiness Standards: Aircraft Engines, the design and construction of the engine and the materials used must comply with the fire protection requirements, such as the pipe and tank which contains flammable fluids. Fire-proof tests will be carried out on pipe joints and box parts of an aero-engine. Combining with test data analysis, fire-proof performance of aero-engine parts will be studied. On this basis, the airworthiness certification elements of engine fire protection are explored
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