Brian,
Short answer: If the light is a normally closed switch and opens with
the with the door latch engaged, in the event the switch failed or bulb
burned out during taxi or door openned and closed again for some reason
just prior to takeoff while awaiting traffic, a warning light check is
done in many comercial/military aircraft to assure circuit, and warning
light are functioning (along with a visiual check). This checks the
circuit is good and not a "warning / malfunction system" failure giving
a false safety check. It seems if the lights are normally out for
takeoff, but go unnoticed in the on position during taxi, pilots are
creatures of habbit, if they didn't notice the lights during taxi, they
sure as heck wouldn=99t be looking at the light while they are
closing the door. They are busy getting ready for takeoff. And so many
times, pop went the canopy.
"Canopys closed and locked, stripes aligned (push checked secure for
us), warning lights out, test good. Ready for takeoff sir."
It was and still is part of the redundant redundancy check we have gone
through to assure canopys/doors are not lost on takeoff.
Push on the door still works. No lights, bells, whistles, just plain
checklist adherence.
"Doors checked secure."
Regards,
Bud Yerly
----- Original Message -----
From: Brian Davies<mailto:brian.davies@clara.co.uk>
To: europa-list@matronics.com<mailto:europa-list@matronics.com>
Sent: Friday, October 03, 2014 4:22 AM
Subject: RE: Europa-List: Re: In flight noticed the rear door pin out
-horror
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?
Standard check on ground-
Door open, red light on
Door closed, red light out
Surely you have just done a light test ?
Regards
Brian Davies
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Bud Yerly
Sent: 02 October 2014 23:10
To: europa-list@matronics.com
Subject: Re: Europa-List: Re: In flight noticed the rear door pin out
-horror
Tony,
Just make sure you have a push to test as "no light" doesn't tell the
whole story. It's just test cirucuit and extra wire. I can build a
door in the time it would take to lead you through how to do it fail
safe with proper door plunger switches that are adjustable.
I just saw something the other day. A strap of line attached to the
door handle so his wife could pull the door down. It was a lovely
decorative line, worthy of any draperies. Too bad it catches your hand
anytime you reach your hand forward or aft. I guess his wife does not
touch the controls or move when she is in the plane. He had no door
guards either.
I'll just push on the door in the center after closing. If you push
firmly, you will assure a latched door or see it move.
Regards,
Bud
----- Original Message -----
From: Tony Renshaw<mailto:tonyrenshaw268@gmail.com>
To: europa-list@matronics.com<mailto:europa-list@matronics.com>
Sent: Thursday, October 02, 2014 5:40 PM
Subject: Re: Europa-List: Re: In flight noticed the rear door pin
out -horror
Hi Max,
Rather than 2 green door lights continually on, my intention is to
have a single circuit through both shoot bolt switches, and if either
isn't closed, the door and the circuit, a red light stays on, or
inflight comes on. That way, my panel has no lights unless something is
wrong.
Tony R.
Sent from my iPad
On 3 Oct 2014, at 2:31 am, Fred Klein
<fklein@orcasonline.com<mailto:fklein@orcasonline.com>> wrote:
On Oct 2, 2014, at 6:44 AM, Max Cointe (Free)
<mcointe@free.fr<mailto:mcointe@free.fr>> wrote:
but if you want some cheap insurance too put a switch on each of
the rear
shoot bolts that puts a ground on a bright red LED directly in
front of you
on the panel...
And then install a test button to verify that the leds are still
alive.
Complicate cabling AND checklist.
With thanks to Raimo Toivio for the design and components, I have
mounted two robust pressure switches which will give me two lit green
LEDs on the panel when the rear shoot bolts for the two doors are
engagedno need for test button to ensure system is
operationalreally quite simpleI=99ve also fabbed
tabs on both doors which are located so that pilot can reach to ensure
firm closure w/o relying on passengernonetheless: Checklists
Rule !!
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