Hi,I have found that when setting teh autobrakes to say 2 in preparation for landing they are set OK, but after touchdown if I want to increase the autobraking to say 3 or 4, when I click on the autobrake switch to increase it disconnects and returns to the off positionSurely this is not correct??????Jonathan

HiWithout being a Boeing expert, this is the way it's supposed to work.BrgdsFlemming

I'm not so sure about that. Below some quotes from a previous post of mine, mostly based on information out of official B737 documentation. I am 100 % positive that, in a video, I have seen a pilot switch the auto brake to a higher setting during auto braking in a Boeing aircraft, although I don't remember what type. I really think the autobrake isn't modelled right."In the PMDG AOM on page 88 it specifically states that theAutobrake disarm light should come on after manual braking.And that is how it works in the real thing, so I think thisissue should be adressed in the upcoming patch.Also, even by using the above-mentioned work-around the factthat the switch jumps back to off is incorrect. Ondisconnecting the autobrake in the real thing, the switchstays just where it is. Only the disarm light will tell youit is off.BTW, another work-around I discovered is oddly enough to usethe mouse when it shows the + sign. Rather than increase thesetting it will also switch back to off. Needless to say thisis not how it works in the real thing :-) In fact, I thinkyou could actually increase the setting during autobraking."Leo Bakker

>Hi>>Without being a Boeing expert, this is the way it's supposed>to work.>>Brgds>>FlemmingSorry, I don't think it is supposed to work this way. Without exception, this does not happen on any other Boeing aircraft I have in my hangar. I can increase the autobrake setting during rollout.jonathan

HiWell as i said i'm not a Boeing expert, only DC/MD expert due to my job as aircraft technician.Ehh are we talking real life hangar with Boeing or FS hangar ;-), i've seen other "buggy" Boeing ins FS world, but let me check manuals at work and i'll return hopefully with the rigth answer.BrgdsFlemming JansenPS Customer option from aircraft manufactor is wide open with alot of customer option, just to clear things a bit

Jonathan,As a self proclaimed Boeing Expert *:-* I can only tell you that the 757,767, 777 and 747 all have Auto Brake selectors that snap to the 'OFF' postion when disarmed (either manually or via pedal input). Unfortunately I don't have real world experience on the 737 so I can't say that it is the same but I thought it would be for commonality. I am sure there is an NG driver in the mix that answer this for certain but that is the way it was modeled the way it is. RegardsPaul GollnickTechnical Operations/Customer Operational SupportPrecision Manuals Development Group[www.precisionmanuals.com]

"I can only tell you that the 757,767, 777 and 747 all have Auto Brake selectors that snap to the 'OFF' postion when disarmed (either manually or via pedal input)."Actually, Paul, on the 767, 747 and 747-400, they snap to the 'DISARM' position ;-) They only go to "OFF" if you had RTO selected and you took off. These aircraft allow higher selections during rollout.On these two aircraft, if the autobrakes trip off, say as a result of manual braking, if you want to reselect them, certain re-arming and application logic must be satisfied. The switch rearming logic may be satisfied, but the application of brake pressure logic (which is different) may not be. E.g. on the 767, the A/B computer needs to see the average wheelspeed above 60kts momentarily (and current speed greater than 30kts) for brake pressure to be applied. If the wheels don't spin up to 60kts, the autobrakes will release at 30kts, not bringing you to a full stop.No doubt the 737 has some similarly horrendous logic....but looking forward to reading about it :-)Cheers.Ian.

"No doubt the 737 has some similarly horrendous logic....but looking forward to reading about it :-)"The smartcockpit.com website has some interesting data on 737 Autobrakes....E.g. RTO does not go to OFF on liftoff. If you leave it in RTO for landing, it has no effect on the brakes.Definitely not your typical Boeing ;-)Cheers.Ian.

Hi Paul,I had two hours in a KLM 737-800 sim on Wednesday and this was one of the things I specifically noticed and in fact discussed with the KLM pilot who acted as my "co-pilot" : it does NOT go to OFF on disarming! It stays right where it is, both for RTO and for the other settings. This also exlains why in the official Boeing check-list for Shutdown you have to check the setting, if it tripped to off automatically there would be no need.Leo Bakker

So.. another one for the patch.Tero

Thanks for the info Leo, The AOM wasn't real clear on this. Did you get a chance to use the autobrakes? I know most of the other Boeings have a spring loaded switch and it appears the 737 does not. Just want to confirm. Will let Lefteris know to add it to the stack. RegardsPaul Gollnick :-coolTechnical Operations/Customer Operational SupportPrecision Manuals Development Groupwww.precisionmanuals.com

Your absoulutely Right, I knew it spring loaded back but forgot about the 'disarm" position on the Bigger Boeings. One click away from Off. :-) And I did check our AOM and yes you can select a highter setting during rollout, just in case you don't want your feet touching those dirty rudder pedals :-lolThanks for your input IanRegardsPaul Gollnick :-coolTechnical Operations/Customer Operational SupportPrecision Manuals Development Group[www.precisionmanuals.com]

HiJust want to add some info about the autobrakes, to confirm some previous posts in the thread.Setting autobrake after touchdown:The landing autobrake settings may be selected after touchdown prior to decelerating through 60 kts of ground speed. Braking initiates immediately if both forward thrust levers are at idle, and the main wheels spin-up.Taking off with RTO mode:The autobrake RTO mode is automatically disarmed when the airplane is airborne. However the AUTO BRAKE DISARM light does not illuminate, and the switch remains in the RTO position. It is necessary to manually set the switch to the OFF position. Landing with the RTO setting will not initiate any autobraking, and will cause the announciator light to light up 2 seconds after touchdown.Hope it helps.Regards,Zoltan HegedusBudapest, Hungary

And to add to that, yes, I did use the autobrakes in the KLM 737-800 and for the landing I can absolutely confirm that after manual braking the switch stayed in the position it was in, say, setting number 1, but the disarm light would come on.Leo Bakker

I dug up these pieces of trivia in my Lufthansa manual today:- if you set the autobrake to RTO it will self-test, as indicated by the DISARM light illuminating for 2 seconds (as modeled in the DF737, BTW)- if you LAND with the selector still in RTO it won't function, the DISARM light will go on after 2 minutes, not seconds as previously mentioned- the autobrake is actually armed for take-off when anti-skid switch on, autobrake RTO, airplane on ground, wheel speed less than 60 kts and both throttles in idle- if throttles are retarded between 60 and 90 kts the system will disarm and the DISARM light will come on- autobraking on take-off will only occur with wheel speed greater than 90 kts and both throttles in idle- they may be deactivated by moving the speedbrake handle from position beyond armed to down, by depressing brake pedal after 2 seconds of RTO mode activation or 3 seconds after autobrake activation, by advancing throttles after touchdown for GAThe manual is for the 3/4/5, but I don't think much has been changed for the NG. Enjoy :-)Leo Bakker