Posted for randy snarr
<randylsnarr@yahoo.com>:
There was talk about flap motor over run years ago. If the system is built
per plan, there are relays
that momentarily reverse power to the flap motor
stopping it immediately when you let off the switch so the motor does not
drift with no
power.
It sounds as though your flap motor is powered without the relay system in
place..
There was a diagram out several years
ago that used Bosch relays. I used this
updated drawing and have never had an issue with the flap system...
FWIW
Randy
Snarr
N694RS
[If memory serves, the standard wiring for the flaps on a 360 uses the NC contacts on the relay to short the flap motor
leads together when the relay de-energizes, essentially using the spin-down rotational energy in the motor as a brake. I thought the updated
drawing was out on the website but apparently it's not. I'll see if I can dig it up from the archives and get it posted... the biggest
difference between the updated factory drawing and that one was the addition of flyback diodes to the relay coils and the replacement of the
automotive-style relays with the small Bosch cubes which were designed to power an inductive load. <Marv>
]
"Flight by machines heavier than air is unpractical and insignificant, if not
utterly impossible"
-Simon
Newcomb, 1902
--- On Mon, 11/8/10, Jeremy Fisher <jffisher@gmail.com> wrote:
From: Jeremy Fisher
<jffisher@gmail.com>
Subject: [LML] 360 Flap Failure
To: lml@lancaironline.net
Date: Monday, November 8, 2010, 11:35
AM
I went through the DAR inspection on my 360 last week. It sailed through
with just a couple of minor comments until we
got to the flaps. They worked
when the DAR arrived, but when I tried to raise them, the fuse blew and
nothing happened, even with a new
fuse. In retrospect, I am almost certain
that it was a problem that I saw once before, in that the flap actuator
probably overran the
limit stop. I can move the stop in the actuator a small
amount, but I am not sure that it will be enough. Does anyone have a
solution? Looking through previous List entries, I see a reference to
installing a jumper across the limit switch. Is this the
answer, and if so,
how does it work?
Jerry Fisher
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