Woodward 5453-279 12-slot Chassis Rack

5453-279 mentioned some inspections. Are all signal lines of the logic solver channel individually routed at all positions? Is the logic subsystem channel located on a separate printed circuit board? Are the logical subsystem channels located in separate cabinets? Does the channel use different electrical technologies, such as one electronic technology or programmable electronic technology, and another relay? Do these channels use different electronic technologies, such as one electronic technology and another programmable electronic technology? Do you use media diversity, such as hardware diagnostic testing using different technologies? Is the channel designed by different designers without communication during the design activities? Are separate testing methods and personnel used for each channel during debugging? Is the maintenance of each channel carried out by different people at different times? Will cross connections between channels hinder the exchange of any information other than for diagnostic testing or voting purposes? Is this design based on the technology used by devices that have been successfully used in the field for over 5 years? Do you have more than 5 years of experience using the same hardware in similar environments? Is the system simple, such as no more than 10 inputs or outputs per channel? Are the inputs and outputs protected by potential levels of overvoltage and overcurrent?

Have you checked the results of fault mode and effect analysis or fault tree analysis for 5453-279 to determine the source of CCF, and have you eliminated the predetermined common cause fault source through design? Has CC failure been considered in the design review and the results have been fed back into the design? Has all on-site faults been thoroughly analyzed and fed back into the design? Is there a written working system in place to ensure that all component failures (or degradation) are detected, the root cause is determined, and other similar projects are checked for potential causes of similar failures? Is the program in place to ensure that maintenance (including adjustment or calibration) of any part of the independent channel is carried out in a staggered manner, and that diagnostic testing can run satisfactorily during maintenance, in addition to manual checks conducted after maintenance. Perform maintenance on one channel and start maintenance on another channel? Does the recorded maintenance procedure stipulate that all components of the redundant system (such as cables) are independent of each other and cannot be reinstalled? Are all repairs to printed circuit boards carried out at qualified repair centers, and have all repair items undergone comprehensive pre installation testing? Is the diagnostic coverage rate of the system low (60% to 90%) and reporting faults to the level of replaceable modules on site? Does the system have a moderate diagnostic coverage rate (90% to 99%) and report faults to the level of replaceable modules on site? Does the system have a high diagnostic coverage rate (>99%) and report faults to the level of replaceable modules on site? X