Pmdg 737 Autobrake Disarm
Jan Dominquez
I had a problem with the autobrake disarm light remaining on after I mistakenly choose the 1 position first before the RTO. I thought it would still go off after few seconds but it remained on during the whole flight.So is that considered a failure that I need to clear up on the NGX FMC or is it normal? Also I have tried putting it back on disarm and RTO again, but same result.
Hello,On today's flight I noticed that once airborne, if you select AutoBrake to RTO the amber light won't illuminate. In a real life I use it to remind me fuel when I'm xfeeding. It 's just a bug? can it be fixed?Thank you
The amber AUTO BRAKE DISARM light will not illuminate once airborne, this is normal system behaviour. There is no need to inform the flight crew that the auto brake system is disarmed because it should be disarmed when the airplane is in the air.
Hi mark, thanks. What I ment was that once airborne, the autobrake disarm wont illuminate. but, if u put the switch in the off position and then back to RTO, in a real life the amber light illuminates, but not in the NGX. As I said, I use this method when I'm xfeeding fuel, and the amber light remindes me....
No, on the classic the disarm light comes on for TOSC and will not extinguish because of the missing aircraft on ground signal.Maybe it is the same for the NG.I think you could send a ticket about it to let PMDG check this and eventually fix for sp2 (maybe too late for sp1c)
I have a problem: I noticed that my almost every single time I try to perform a RTO the autobrakes disarm almost immediately when closing throttles. This is the sequence: A/T armed, everything set up, RTO selected. I push TO/GA switch, start rolling, after 90 kts I disarm A/T and close throttles ti idle, sometimes autobrakes disarm immediately, sometimes I get a maybe 1 sec of braking action and the the autobrakes disarm. About 2/10 of my attempts end in a succesful braking an rejected takeoff though. My first thought was of course that it is a controller conflict because if I have understood correctly the autobrakes should disarm if throttles are advanced or speedbrake lever is moved. So I tried playing around with the controller setting but nothing helps. Then I even tried the following: I used the FS "disable joystick" button and disabled my controllers completely, used mouse and keyboard to start the takeoff roll, the above 90 kts or so cliked off the A/T and hit F1 to close the throttles and STILL the autobrakes disarm???
I am using CH throttle quadrant, CH pro pedals and flightsim yoke. Before starting FS I start the CH manager and download the controllers in a "direct mode". Excluding this problem everything works fine with the controllers.
TOGA activated> rolling> HOLD mode activated> 100kts> announcing "REJECT"> slam the throttle levers to idle and speedbrake UP> autobrake active> switching AT to OFF> at 0kts autobrake disarm light illuminated.
I don't think you can accidentally disengage autobrakes in rto with brake pedals because, to disengage them, you would have to apply more manual braking then the autobrake is already applying. If you have a spoiler lever asigned, maybe the conflict is there because autobrakes will disarm when you retract the speedbrakes...
Its really not clear does pilot need to out-force autobrake to disarm it, or its enough to just apply any amount of force on pedals. I think it could be very hard to out force autbrake system in RTO mode.
I have the same problem here and it only happens when performing a RTO, First time when FSX is started making a RTO all works fine but after that I can not make a RTO again the AUTOBRAKE disarm light illuminates But when landing and the autobrake is selected to 1, 2, 3 or MAX the system operates correctly. I can not figure out what is causing the RTO to fail. Same one have any idea ???!!!.
This is annoying as hell. I even experimented yesterday by unplugging all my controllers (flightsim yoke, ch thr quadrant and pro pedals) from my computer. Still, after 90kts, A/T off --> F1 for IDLE thrust, I get a swcond or two of braking action then autobrakes disarm. Any ideas anyone??
I think I FINALLY (after total 15h+ axperimenting) solved the problem. I can do RTO:s how many times I want as long as I do NOT engage reverse thrust during the deceleration. Immediately after I engage reverse, the next time I roll down the runway and execute RTO the autobreak disarm problems begins. Every time. And after that only solution is to restart FS. I can reproduce the problem every times like this.
If anyone would have the time tot try this out to see if it is a general bug or only a problem on my rig I would appreciate it very very much! So: First a few rejected takeoffs in one session with no engagement of reversers and then one with the engagement of reverser. On the next rejected takeoff after that I would expext the autobrakes to disarm immediately on idling the throttles. Please report here if you find similar results!
I was advancing the thrust levers manually to 40% then enadling TOGA mode but was leaving the throttle quadrent alone (still cracked open). At RTO, I was using the F1 key but with the throttle quadrent still cracked open, the autobrakes were disabiling (like they should).
At first I had the "bouncing issue" that is described in the manual in mind, because - maybe - it would let the aircraft shortly being airborne again for a split second so that the autobrake would disarm. But no, I changed the mesh as recommended and it happens anyway.
With the NGX (and the 777) it's almost always 'noisy' pedel hardware. You can test this by disconnecting your pedels during a landing and see if this still happens. Also, if you have the parking brake kicking off at the gate a lot; even with the lightest touch to the pedels, it's probably your hardware.
I think the problem is, that one condition for the autobrake activation is -> throttles idle. My throttles are only in complete idle when on the ground, regardless of A/T armed or not. On the ground they work fine.. in the air if I retard them, they go back to the idle detend and then move i little forward again - as I said, on the gorund that does not happen!
I have an issue with autobrake that do not disarm automatically after landing ans after applying brakes for landing.
Is it an issue? If I remember, it seems that they did that before but I am not so sure.
I have no problem with the Zibo 737 or FF320, JD 330 & 320.
thanks for help.
You may also need to make sure you turn off the autopilot AND the autothrottle just before touchdown to get things working to stop the plane. They are two separate things to accomplish. Just turning off the AP won't turn off the autothrottles.
The autobrake system ( at least on the A-300-600R and the 757/767 that I flew) modulates the brake pressures to provide a certain deceleration force. It is engaged by making a selection on the knob on the panel.
As far as pilots had to know, you set the knob and that was that. The settings on the 767 were RTO (rejected takeoff, used on takeoff, obviously!) and disarm (just what the name suggests - when some other setting is engaged and you brake manually to a level of deceleration higher than the selected autobrake setting it disarms the system and the knob snaps to "disarm"). and then 1-4 and finally max auto.
If I recall from my perspective of 8 years of retirement, the setting that produced the greatest brake effort was RTO, which was full balls-to-the-wall brake pressure, resulting the the shortest possible stopping distance, an effort you could not really exceed by manual braking. Of the landing settings, 1 was so mild that reverse thrust would usually provide at least that decelerative force, and the autobrakes would not really engage until reverse was stowed. Level 2 or three was what I usually selected ( I used them all the time, wet or dry) and would provide a perceivable level of deceleration but not an uncomfortable one (throwing one into the shoulder harnesses). Those levels were 4 and max auto, and they might be used on a short runway or one that was known to be slippery (the antiskid system still worked with the autobrakes - they were independent and would work together). Max auto was said to be similar to a manual max effort stop, where you literally stood on the brake pedals and let the antiskid modulate you to a stop.