Spoiler arm auto-deployment

[dnoize]

i promised last week i would check this in the aircraft and the results can be found here:

http://www.mycockpit.org/forums/show...0422#post80422



Stef


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[Mr. Midnight]

im glad this subject was brought up, i however have not not gotten that far as to why , what and when they deploy.

i fly the level d and there is a lot to this plane and i have just now gotten to the point of understanding what the spoilers do beside slow the plane down.

first of all is the spoilers just flaps on the wing that go up too give more resistance to the plane helping slowing it down.

and when armed does that mean when the plane touchs down that deploys the spoilers.

and here is a dumb question do i hit the breaks as the spoilers ingage.

im not for sure even where to set the auto breaks.

is there a website where i can get this information on how and why and when to this or perhaps you good folks can help me in that area.

Thanks........Robert

[vidarf]

The spoilers are the thingies on the top of the wing that is raised. They serve three purposes:
1. Aiding the ailerons to bank the aircraft
2. Slightly raised for in-air speed reducing (increases drag)
3. Breaks the lift and add drag when landing

Here's a great source of information on this subject:
http://www.b737.org.uk/flightcontrol..._/_Speedbrakes

When the spoilers are armed, they will auto-deploy under given conditions. For example if the wheels has spun up and the right main gear strut is compressed (at least for 737).

If I'm not mistaken, the autobrakes is just that - AUTOmatic brakes. When the ground speed sinks below a certain value, the autobrakes is deactivated ("manual brakes"), or the plane will come to a complete standstill. No need to touch the brakes before you've switched off autobrakes.

As a curiosity: on the real 737, it is adviced that one keeps a light pressure on the brakes when autobrakes is disengaged, to make the transition smooth for the passengers. Not fun standing in the entry area greeting people with baggy trousers farewell...

At least this is what happens in a 737, as far as I know.

The settings for autobrakes depends on the runway length, the runway condition, weight of the plane and so on. Just use the middle value until you get the feel of it - there are no brake disks that needs replacement in a sim!

PS: The website I'm linking to is a GREAT source. It is 737 specific, but much of the info is transferrable to other birds too.