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What causes AutoBrakes to snap back from RTO to off

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So on the ramp before taxi (or even during taxi) when I try to select autobrakes RTO it just snaps back to off.

Havent been able to discern a pattern as to why as yet.

Thoughts?

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  • Commercial Member
15 minutes ago, Boomer said:

So on the ramp before taxi (or even during taxi) when I try to select autobrakes RTO it just snaps back to off.

Havent been able to discern a pattern as to why as yet.

Thoughts?

Garbage data/calibration on your hardware. Recalibrate and set a proper null zone.

Kyle Rodgers

  • Author
2 hours ago, scandinavian13 said:

Garbage data/calibration on your hardware. Recalibrate and set a proper null zone.

So then an issue with my HOTAS x65 throttle null zone ya think?

I will check that option out and advise back, brother Kyle.

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  • Commercial Member
19 minutes ago, Boomer said:

So then an issue with my HOTAS x65 throttle null zone ya think?

Probably. There's something causing it to kick off, and it's likely hardware.

Kyle Rodgers

The only thing which can cause the RTO to trip to OFF is liftoff, power failure, normal antiskid or autobrake failure. Unless your joystick is simulating the aircraft lifting off the ground, then it shouldn't be the joystick.

RTO will arm even with the IRUs off and the park brake set.

John H Watson (retired 744/767 Avionics engineer)

10 minutes ago, Qavion2 said:

The only thing which can cause the RTO to trip to OFF is liftoff, power failure, normal antiskid or autobrake failure. Unless your joystick is simulating the aircraft lifting off the ground, then it shouldn't be the joystick.

On the real thing maybe so, but in the sim there's all kinds of stuff going on and hoops the developers have to jump through to get FS to depict a 747, so in the sim it certainly could be the joystick spiking or sending spurious signals.

Alan Bradbury

Check out my youtube flight sim videos: Here

14 minutes ago, Chock said:

On the real thing maybe so, but in the sim there's all kinds of stuff going on and hoops the developers have to jump through to get FS to depict a 747, so in the sim it certainly could be the joystick spiking or sending spurious signals.

Indeed. There's an easy way to test. Disconnect the joystick and see if the behavior continues... 

Best regards,
--Anders Bermann--
____________________
Scandinavian VA

Pilot-ID: SAS2471

9 hours ago, Qavion2 said:

The only thing which can cause the RTO to trip to OFF is liftoff, power failure, normal antiskid or autobrake failure. Unless your joystick is simulating the aircraft lifting off the ground, then it shouldn't be the joystick.

RTO will arm even with the IRUs off and the park brake set.

In the "real world" also hitting the brake pedals.

Regards
Jo va Bra

3 minutes ago, Jovabra said:

In the "real world" also hitting the brake pedals.

Regards
Jo va Bra

Hitting the brakes after landing with auto brakes set to 1 through 4 will disarm them, but manual braking will not disarm RTO. Many crews arm RTO mode as part of standard checklists post-engine start, before beginning their taxi to the runway, and manual braking will certainly be employed during the taxi.

 

Jim Barrett

Licensed Airframe & Powerplant Mechanic, Avionics, Electrical & Air Data Systems Specialist. Qualified on: Falcon 900, CRJ-200, Dornier 328-100, Hawker 850XP and 1000, Lear 35, 45, 55 and 60, Gulfstream IV and 550, Embraer 135, Beech Premiere and 400A, MD-80.

According MM 32-42 Autobrake deactivated.
1.. Brake pedal press>750psi
2.  Throttles are advanced
3.  Speed brake lever is moved to down detent

Regards
Jo va Bra

7 minutes ago, Jovabra said:

According MM 32-42 Autobrake deactivated.
1.. Brake pedal press>750psi
2.  Throttles are advanced
3.  Speed brake lever is moved to down detent

Regards
Jo va Bra

But not in RTO mode. Think about it: if those conditions also applies to RTO it would disarm immediately the thrust levers were advanced for takeoff, which would be somewhat counterproductive!

Simon Kelsey

sig_FSLBetaTester.jpg

 

My mistake. It is not in the RTO mode but in the Auto Brake mode.

regards

Jo va Bra 

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