Simviation Forum - Autobrakes

Jun 16^th, 2006 at 11:14am

flyboy 28 Offline
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Jacksonville, FL

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Not sure if this goes here or Flight School, but I just had a question about autobrakes. I was flying the 747 around in FS and I noticed them.. What are they and what do they do?

Thanks,
James

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Reply #1 - Jun 16^th, 2006 at 11:28am

Craig. Offline
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Birmingham

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its the automatic wheel brakes.
RTO is for a rejected take off and is set before TO.
The other numbers are for landing and each number is a differant level of braking depending on runway length and conditions.

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Reply #2 - Jun 16^th, 2006 at 2:51pm

Theis Offline
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And i guess RTO is the most powerful, right?

Bar by Mees

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Reply #3 - Jun 16^th, 2006 at 7:52pm

SkyNoz Offline
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And i guess RTO is the most powerful, right?

Rejected, Takeoff etc.

The auto-brake is used for landing but can be used for a emergency takeoff to stop. On takeoff you would set for RTO.

Then for landing you can set on any level you want 1 being the lowest braking amount, all the way to "MAX AUTO"! These setting are set before landing. This alows you to not need to press . or whatever you have set for braking, they automatically come on when you touchdown! Grin

Project Kfir!&&&&My Gmax page&&Aircraft modeler/Aircarft painter&&&&Aye the key!&&[GeneralEngineData]&&//0=Piston, 1=Jet, 2=None, 3=Helo-Turbine, 4=Rocket, 5=Turboprop

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Reply #4 - Jun 17^th, 2006 at 10:32am

expat Offline
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Rejected, Takeoff etc.

The auto-brake is used for landing but can be used for a emergency takeoff to stop. On takeoff you would set for RTO.

Then for landing you can set on any level you want 1 being the lowest braking amount, all the way to "MAX AUTO"! These setting are set before landing. This alows you to not need to press . or whatever you have set for braking, they automatically come on when you touchdown! Grin

Bearing in mind this is the "real aviation" forum, could anyone show me where the "." button in any aircraft that operates the breaks? Grin

Matt

PETA People Eating Tasty Animals.

B1 Boeing 737-800 and Dash8 Q-400

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Reply #5 - Jun 17^th, 2006 at 12:00pm

SkyNoz Offline
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Bearing in mind this is the "real aviation" forum, could anyone show me where the "." button in any aircraft that operates the breaks? Grin

Matt

.. Rudder pedals operate the brakes (push on both and you stop), along with auto brakes for before takeoff and before landing procedures.

Project Kfir!&&&&My Gmax page&&Aircraft modeler/Aircarft painter&&&&Aye the key!&&[GeneralEngineData]&&//0=Piston, 1=Jet, 2=None, 3=Helo-Turbine, 4=Rocket, 5=Turboprop

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Reply #6 - Jun 18^th, 2006 at 5:35pm

Nexus Offline
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.. Rudder pedals operate the brakes (push on both and you stop), along with auto brakes for before takeoff and before landing procedures.

I think SkyNoz isn't aware of the issue that "the-ex-pat" is infact a real 737 mechanic and probably knows more about autobraking than anyone else on this forum Grin

Manual braking is always stronger than autobraking and it will override the autobrake during the landing roll.
RTO will kick in when you retard the throttles during the TO roll and you are above 90 knots

Autobrakes are wheelbrakes that are monitored by a system that maintains a specific brake pressure.
It senses deceleration rate and applies brake pressure according to selected rate on the panel. (1,2.3, MAX etc)

The system should be used for all landings if it's available. As the main gear touches down, the autobrakes are activated causing the nose of the aircraft to pitch down. The front wheels can be eased onto the runway by small elevator input. Someting FS2004 does not depict well at all. Manual braking is usually used after 80kts.

Boeing 737 autobrakes:
Autobrake 1 = 4ft/sec decel rate
2= 5ft/second decel rate
3= 7.2 ft/second decel rate
Max= 14ft/ sec above 80kts
12ft/sec below 80kts
RTO= decel rate not controlled.

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Reply #7 - Jun 18^th, 2006 at 5:48pm

C Offline
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Earth

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Bearing in mind this is the "real aviation" forum, could anyone show me where the "." button in any aircraft that operates the breaks? Grin

Matt

I've always thought a "p" for pause would be most useful in real cockpits... Grin

Needed it on more than one occasion... "Shift Z" would be useful too... Wink

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Reply #8 - Jun 18^th, 2006 at 5:55pm

Ecko Offline
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I've always thought a "p" for pause would be most useful in real cockpits... Grin

Needed it on more than one occasion... "Shift Z" would be useful too... Wink

Yeah, it sucks not knowing what kinda framerates you're flying at.. Tongue

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Reply #9 - Jun 18^th, 2006 at 6:06pm

C Offline
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Yeah, it sucks not knowing what kinda framerates you're flying at.. Tongue

Its nicer for actually knowing your G and Speed and Altitude without having to look at 3 different gauges!
Grin

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Reply #10 - Jun 18^th, 2006 at 6:21pm

Ecko Offline
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Its nicer for actually knowing your G and Speed and Altitude without having to look at 3 different gauges!
Grin

Well some of us don't have that problem of knowing how many G's we're pulling!! Roll Eyes

It would be very nice to able to press "B" to set the altimeter, though. Grin

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Reply #11 - Jun 18^th, 2006 at 7:57pm

expat Offline
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Boeing 737 autobrakes:
Autobrake 1 = 4ft/sec decel rate
2= 5ft/second decel rate
3= 7.2 ft/second decel rate
Max= 14ft/ sec above 80kts
12ft/sec below 80kts
RTO= decel rate not controlled.

You beat me to it. 02:00 in the am and time for a cup of coffee. I had just opened Bill Bulfers Cockpit Companion to that very page......and closed it again.

Matt

PETA People Eating Tasty Animals.

B1 Boeing 737-800 and Dash8 Q-400

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Reply #12 - Jun 18^th, 2006 at 8:18pm

Nexus Offline
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You beat me to it. 02:00 in the am and time for a cup of coffee. I had just opened Bill Bulfers Cockpit Companion to that very page......and closed it again.

Matt

Actually I had a pretty nice headstart since I just copied an older post of mine regarding autobrakes usage. Grin

I feel like the Roadrunner. Beep Beep Vroooom!
Grin

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Reply #13 - Jun 18^th, 2006 at 8:46pm