There are a lot of things that are not redundant.

The lesson to learn is to know the systems of your plane very, very, well.
This is not an easy task, nor is it common between planes.

You should know all the systems, and the what-if scenarios that go with
them. This includes the mechanical systems. Like how the cables and
pushrods are run through the plane.

For example: What if you pump down the gear but do not get a green
light? Do you cycle the gear? Answer - it depends. You need to give
thought to the possibility that cycling the gear may lose what little
hydraulic fluid you have left. When the hydraulic system runs more
than one thing, you need to worry about what else you might lose.
There is no one pat answer that fits all planes. Reading the emergency
procedures is great - except the emergency procedures have difficulty
determining which combination of failures has happened. You really
need to understand the systems.




In article ne.com, Andrew
Gideon wrote:
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I've been reading the POH for my club's 182RG, and I find myself surprised.
The manual gear extension replies upon the same hydrolic pressure system as
the powered mechanism.

Isn't that insufficiently redundant?

I'm not sure what I expected - perhaps something purely mechanical. But I
didn't expect a lone pressure system to be a single point of failure.

Is this normal?

- Andrew

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