The plane was frozen on the tarmac all night, and it was in a sub-health state before flying, mainly because the viscosity of hydraulic oil and lubricating oil system increased at low temperature, and the water system froze, and the components that were relatively sensitive to temperature changes were affected by the degradation of low temperature performance.
Therefore, the common faults before flight are manifested in emergency lights, equipment cooling, IDG, pressure indication, oil leakage and so on. Effectively increasing the cabin temperature and oil temperature can alleviate the influence of low temperature to some extent.
Therefore, before the winter flight, it is required to start power supply and gas supply two hours before the flight takes off. Close the main hatch and raise the temperature in the cabin to a stable value as soon as possible. Pressurize the hydraulic system, control the rudder surface and check the leakage. Long-distance stop 10 hours or more, it is recommended to warm up the car before flying. Before using IDG and EMDP, there must be no-load running time to raise the oil to the working temperature.
short stop
After a short flight stop, after a round of work, the engine room temperature and oil temperature have increased, and the common faults before flight basically did not show up during the stop. However, the failures related to take-off and landing operations will be manifested, such as the common problem that the shock absorber strut of the nose landing gear is low due to air leakage in the upper section, and the oil leakage of the hydraulic system due to the influence of high altitude and low temperature.
Hanghou
After a day's operation, the purpose of post-flight maintenance is to resist cold weather, mainly to drain water, completely drain the accumulated water in the water system, and avoid freezing of water system components. Clean and lubricate the mirror surface of landing gear shock strut.