Originally Posted by
noooby
First off, I'm just relaying what Leonardo is telling the operators when they ask about this SB. That the AAIB have not (as yet) given them any info about possible or probable causes of this accident.
Sycamore, the TR is duplex hydraulic. It is controlled with a single push-pull cable. Unlike previous Leo machines that have relied on control tubes. Hydraulics cannot be selected off as the aircraft cannot be flown without hydraulics.
I know as much as any 169 operator who asks the right questions
From the picture it seems improbable that both locking means were missing/misinstalled.
There is a more subtle issue of the effects of the washer (140) either missing or on the wrong side. This would not jump out on a visual inspection like missing locking means would.
Not discernible from the drawing but appears that the shoulder the washer sits on is probably just a bit larger than the hole in the hinge bracket (90). Lack of washer would allow the system to operate normally but might cause high stress on the hinge bracket leading to a fracture. Even without a fracture it could dig a hole in the hinge bracket resulting in play that could cause other issues such as the nut being loose which in turn could cause other damage.