"Another solution is to monitor the change of state of the lights while closing
the doors. A red light should be lit and then go out while closing the doors,
or a green light should be off and then come on while closing the doors. This
means you need to be aware of what you are doing while closing the doors and
monitor the light."
Exactly my point Frans.
I have a door warning light system that gets checked every time I fly using the
above method but I don't rely on it. I physically check that the doors are
closed.
Sadly, human beings are more failure prone than a modern LED!
Brian
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Frans Veldman
Sent: 03 October 2014 11:51
Subject: Re: Europa-List: Re: In flight noticed the rear door pin out -horror
--> <frans@privatepilots.nl>
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Hash: SHA1
On 10/03/2014 10:22 AM, Brian Davies wrote:
> Am I missing something here? If you have a door warning circuit that
> brings a red light on when the door is open why do you need a test
> circuit?
Whether you have a red light that comes on when the door is unlocked, or a green
light that goes out when the door is unlocked, both systems can fail easily.
A lit green light might be caused by the switch sticked in the on position, or
a red light might not lit because a wire is broken.
If we would rely on lights instead of a physical confirmation that the door is
locked, we would for sure have more door-incidents!
A solution is to have a test-switch, so you can confirm that the system is
working
properly.
This means you have to put "test the door lights" on your checklist.
Another solution is to monitor the change of state of the lights while closing
the doors. A red light should be lit and then go out while closing the doors,
or a green light should be off and then come on while closing the doors. This
means you need to be aware of what you are doing while closing the doors and
monitor
the light.
Bottom line is:
Instead of feeling that the door is closed we now have to push a button, or we
have to monitor the change of state of a light.
We don't gain anything by this.
I'm fond of gadgets in my airplane, but this one didn't make it for the reasons
above. It is completely useless. One potential for missing something on the
checklist
is then replaced by another potential to mis something on the checklist.
Frans
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