The overall aim of this task is to assess both IGB & Main Gearboxes reliability by analysing them individually with FTA & FMECA before then combining them into one spreadsheet diagram using RBD’s tailored towards their own individual characteristics in order to identify any possible lost items or areas where further maintenance/repair may be required due their lacklustre performances during normal operations/flight time periods etc.? This aside from providing additional insight into causes of specific faults also helps in determining whether any new design changes would have a positive impact on reliability ratings respectively whilst also taking into consideration potential safety issues that may arise due an unexpected fault occurring during flight periods etc.?

Using FTA we can start off by looking at various root causes behind IGB related faults found within our chosen aircraft type – e.g., insufficient oil pressure leading towards bearing wear out over time; faulty sensor readings throughout different stages leading towards inaccurate airspeed indications; loose mounting bolts producing vibrations during higher speed operations causing further structural damage etc.? These amongst other similar scenarios should all be mapped out accordingly without overlooking any minor details since they too might turn out being useful later down the line especially after performing our following FMECA analysis which would look something like: analyzing detailed technical drawings; calculating MTTF’s (Mean Time To Failures); conducting BDPP’s (Break Down Probability Plots); formulating SODA’S tables etc.? All these efforts combined should theoretically provide us with enough information needed in order create a well-rounded view concerning both IGB & Main Gearboxes respective safety levels not just from standalone point of views but rather from one involving whole aircraft itself – thus providing engineers with valuable feedback pertaining design improvements/changes so as ensure same isn’t replicated going forward anytime soon?

Continuing on now let us discuss about RBD’s use within our current context here – basically speaking this tool works by combining aforementioned analyses’ results together so as produce logical diagrams visualizing how certain subsystems interact between themselves under different conditions alongside helping us track “failure flow paths” thereby allowing us determine input vs output values better enabling cross referencing various related entries facilitating more accurate predictions overall? Furthermore if we were able analyze System Safety Levels through said diagrams then ultimately it would help expedite process significantly since no longer do people need manually go through every single entry separately but rather just examine larger picture first making sure all necessary measures satisfied before moving onto finer details? As always doing thorough research beforehand remains critical though even while relying heavily upon these tools since there still some cases where discrepancies might occur between actual findings expected ones although thankfully majority those tend get resolved fairly quickly given sufficient knowledge base available regarding given topic matter concerned!