Abstract
To guarantee the successful completion of airworthiness certification test for a certain type of aircraft, the leakage and discharge compliance criteria of flammable liquid were designed by studying airworthiness requirements and the design characteristic of the civil aircraft, where flammable liquid leakage zones and hazardous zones in which liquids are not allowed to enter were determined. Further the test equipments and the dyeing liquor for replacing flammable fluid were developed, and ground and flight test methods were proposed. Moreover, the above test equipment and methods were applied to flight tests of flammable liquid leakage and discharge for certain civil aircraft. The test results show that the test equipment is stable and reliable, and the flight test method can accurately demonstrate the flammable liquid leakage and discharge.
Highlights
Fuel oil, hydraulic oil and other flammable liquids always exist on aircrafts where it is inevitable that these flammable liquids sometimes leak during flights
The airworthiness authorities pay attention to the fire safety of civil aircrafts[1], and require the safety analysis according to the CCAR25 clause
The test method of flammable liquid leakage and discharge is closely related to the aircraft structure and discharge system structure
Summary
Hydraulic oil and other flammable liquids always exist on aircrafts where it is inevitable that these flammable liquids sometimes leak during flights. Further it is necessary to demonstratively test the discharge design of the potential flammable liquid leakage area of aircrafts to show the compliance[2]. The available materials show that the leak discharge test method of military aircraft does not meet the requirements of airworthiness. The test method of flammable liquid leakage and discharge is closely related to the aircraft structure and discharge system structure. According to the design characteristics of certain aircraft, a flight test method of flammable liquid leakage and discharge for the aircraft was developed. This paper includes the determination of leakage and discharge compliance criteria of flammable liquids, the development of the dyeing liquid and the injection equipment, the flight test method, the application and the test results analysis
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