It is still not clear to me why there are two Go Around buttons.I know from experience that, if I need to go around during finals, that pressing the G/A button will do the trick, but that pressing the TO/GA button will let me die.As the correct way to start a take off is to advance the thrust levers, then at reaching 70% N1 pressing the N1-EPR button, I do not understand why and what for there is a TO/GA button.Appreciate your advice...

Jaaky,There is no TO/GA button in the 767.There is the N1/EPR -button on the MCP, and the G/A (not TO/GA) button on the panel.The N1/EPR -button is used to command an FMC precalculated N1 (EPR) -value, like for example in takeoff, when it's pressed, it will make the engines deliver the precalculated takeoff thrust, as annunciated in the EICAS. Changing modes from TRP to CLB, CLB1 etc. will change the commanded N1 mode accordingly.The G/A button is ONLY used for Go Arounds, and it functions ONLY in the air! When it's pressed, the engines will give you max thrust for G/A without going over the limits (which is prevented by the EEC), and two "G/A"s will be annunciated in the EADI. Trying to use the G/A in the ground is a waste of time, as it's not meant to be used there, and will not engage for that matter... :).Hope this helps!Tero

>There is no TO/GA button in the 767.>>There is the N1/EPR -button on the MCP, and the G/A (not>TO/GA) button on the panel.Hi Tero,With all due respect.. but there is !!!See attached screenshot.

Jaaky,Well I overlooked the TRP TO/GA button :).TRP= Thrust Rating Panel = TMSP = Thrust Mode Select PanelThis issue has been discussed many times, and the reason I didn't even think about that one is because too many new PIC-pilots think that:1. the N1 EPR button is a "traditional TO/GA switch" that always activates T/O power, when it is not :)2. the G/A button below the 2ndary EICAS is a TO/GA switch.Now, let me clear this up for you.The G/A button below the EICAS is the "only" G/A switch you will use in the event of a go around. It not only commands G/A thrust, but also commands the flight directors to a go around attitude. This button only functions in the AIR. Note that the real aircraft does not have such a button below the EICAS, but separate buttons on the throttles, that function exactly as the button in PIC.The TO/GA button on the TRP is another thing. The TRP provides control over the Thrust Rating Computer modes of operation. The TRP selections are annunciated within the N1 data display. If the Autothrottle is in use, the thrust settings are limited according to the TRP mode selected.TO/GA: - selects TO mode on the ground - selects GA mode in flightQuote from a B763 operating manual, which reveals that pressing the TO/GA switch also cancels previously selected derates, which might be useful in some situations:"TO/GA

>again: G/A for go around> TO/GA on TRP is merely a thrust mode selector which is>usually never separately selected on the ground, it arms>automatically for takeoff, and the N1 mode will follow the FMC>commanded thrust setting (derated if desired)Thanks Tero, it is clear. :-walksmile Just wondering why Boeing bothered to place that button there...Mysteries of the industry I gues... :D

Jaaky, take a look at my previous message again, added something from the B763 AOM that further clears the issue of the TO/GA button... :)Tero

I'll try clarify a few points regarding the go-around functions:1. On the real aircraft the GA switches are on the thrust levers (one on each) not below the EICAS;2. GA thrust limiting is automatically set by the TMC with the flaps out of up on approach (for example whilst descending clean the thrust reference mode may still say CRZ until flap 1 is selected, then it will annunciate GA);3. If GA thrust is required whilst the aircraft is clean in flight then the TO/GA button on the TMSP will allow full GA thrust to be used;4. When the GA switch is activated the autothrottle will advance to provide thrust to achieve a 2000fpm climb up to the GA thrust limit.Just a few points of interest.

Anthony,Thanks for sharing.Especially the number 3 in your message gives even more clarification as to why the to/ga button exists in trp/tmsp. To go-around in a clean aircraft in full G/A thrust requires for the to/ga button to be pressed. These kinds of information tidbits are sometimes hard to find in the real AOMs as well!One little thing. It's odd that the TRP carries two names, Thrust Rating Panel, and Thrust Mode Select Panel, TMSP. I have 3 different sets of manuals for the 67 and each of them name it as TMSP. So far only PIC's own manuals use the TRP for it. Interesting :).rgdsTero

Hi Anthony,Makes sense. Thanks for the info!:-kewl

"3. If GA thrust is required whilst the aircraft is clean in flight then the TO/GA button on the TMSP will allow full GA thrust to be used;4. When the GA switch is activated the autothrottle will advance to provide thrust to achieve a 2000fpm climb up to the GA thrust limit."Can't say I've considered this before, but...On the 747-400, with the flaps extended, a double push of the TOGA switch(es) on the thrust levers gives full GA limit thrust (as opposed to "up to GA thrust limit" to produce 2000fpm). In this case, on the 747-400, any additional thrust is converted to extra climb speed (rather than airspeed). What would be the procedural equivalent on the 767? (say, if you didn't think a 2000fpm climb rate was good enough).Thanks.Cheers.Ian.

Ian, a fist full of thrust levers to the firewall!As the FD (or autpilot if engaged) is pitching for a speed in GA it will still give accurate commands, the rate of climb will therefore increase!

As the FD (or autopilot if engaged) is pitching for a speed in GA it will still give accurate commands, the rate of climb will therefore increase!"Makes sense.Much appreciated, Anthony.Cheers.Ian.P.S. Interestingly, I read, if the aircraft is below 100', the initial pitch command aims for a vertical speed (+240fpm), holding inertial groundspeed. Above 100', it switches to airspeed.

Tero, Actually you will see 3 GA'S on the EADI ie for the autothrottle mode, the pitch mode and roll mode, then youll have either command or fd annunciated.Plus the autothrottle commands a minimum climb rate of 2000 feet a min and not necessarily max thrust on GA.If this is not achieved then it will go to max.At least on the real aircraft it does so.Cya Sals