The problem of the hydraulic system of a modern airliner
The hydraulic system of a modern mainstream passenger plane is not going to be the case, except for the serious damage caused by other causes. The most serious of the hydraulic failures of the 737 is the failure of the AB system to restore manual control. And the control side of the 737 is all mechanical and steel. Hehe, every time, the subject that the training will fly, it is the tired point, it is not difficult. When AB fails, pitch and roll are not fully mechanical, and the rudder has spare hydraulic. And the whole process of controlling the aircraft's basic safety flight is not a rudder, but an auxiliary, including a landing on the side wind.
Components leakage "and" pipeline leakage "one difference is that: normally component leakage is gradient process more, worsening degree of leakage, if found and dealt with in a timely manner at the early stage of the leakage, such as replacement of sealing ring, again according to the moment immediately following the first class standard pound, can block the leakage of malignant. The piping failure for the mutation process, usually caused by system within the huge loss of hydraulic oil quantity in a short period of time, easily lead to flight delays and other adverse consequences, and in the line of sudden failure prevention, has always been the difficulty is big. The pipe is composed of tube wall and pipe joint. The "pipe rupture oil leak" is mainly caused by the defect of the pipeline design or manufacturing process, which is small and almost impossible to predict. The "pipe joint oil spill" is usually caused by loose joints or damage. Overall, the A320 aircraft in dalian and dalian before enforcement of MD - 82 aircraft, compared to joint the spill situation much better, this is not only related to the plane degree of old and new, are also associated with the design improvement of pipe connection. Great importance to every project investigation and quality analysis, oil leakage events for the position with same problems in a timely manner all possible fleet of census, and according to the census results and engineering analysis, increase the regular inspection items, or shorten test time interval, and statistical analysis of monitoring data on a regular basis, until the danger completely ruled out.
No matter hydraulic, telex or any other transmission. There will be a chance of failure. The key is the reliability of the product and the maintainer's responsibility!
Double use of differential control roll, add and subtract horsepower control pitch, also can be implemented, but it is the practice of extreme conditions, only the ultimate case may do so. From the point of view of the plane system failure, the electronic parts account for about 60% of the total, about 26% of the mechanical part, and about 14% of the hydraulic component. Undoubtedly, the hydraulic system is the most mature and reliable system on board, the real case of system failure due to component failure is less, which is why some key systems, such as flight control system and landing system, one of the reasons still adopts hydraulic pressure as power.
The hydraulic system of a modern mainstream passenger plane is not going to be the case, except for the serious damage caused by other causes. The most serious of the hydraulic failures of the 737 is the failure of the AB system to restore manual control. And the control side of the 737 is all mechanical and steel. Hehe, every time, the subject that the training will fly, it is the tired point, it is not difficult. When AB fails, pitch and roll are not fully mechanical, and the rudder has spare hydraulic. And the whole process of controlling the aircraft's basic safety flight is not a rudder, but an auxiliary, including a landing on the side wind.
