Quick question. Is there any sort of "Auto Go-Around" mode with the 777 A/T? I looked in the FCOM at the Automatic Flight section but couldn't find anything.

 

Here's why I ask:

 

I was doing some circuits at KATL the other day and I had the route set up to take off from 26L, fly ~3 NM past the departure end, make a 90 degree right turn, fly an 8NM base, make a right, fly a 12 NM downwind, make a right, fly base, make a right and then make a 12 NM final starting at the IF for 26R. While I was on final for 26R (about 5-6 NM out), I realized I had been given 26L for the approach so I sidestepped to 26L without changing the approach in the FMC/CDU from 26R. Well, my approach was relatively stable but landing was only OK. The A/T controlled thrust as desired...went to idle at ~25 ft., etc. I touched down once and bounced up to <1 foot (I don't think the MLG ever fully left the ground really) and the spoilers hadn't deployed yet. Before I could settle it in though, the A/T commanded TOGA and I was more or less forced to go around at that point. So, is this normal behavior? Is there ever any condition where the A/T would automatically command TOGA?

 

I did have my controller throttle at idle from the FAF onward.

It got buried quickly...

 

Does anyone know the answer to my question?

Have you tried it again?

 

Did you set the Autobraking before landing? What was it set to?

The A/T won't command TOGA in this situation. Try it again and see if you can replicate. If you are able to replicate, let us know what modes are displayed on the FMA (top of PFD), and also let us know what your A/T override setting is under the PMDG options in the CDU.

 

EDIT: I don't think this would be the cause, but you weren't just about to stall were you? Pretty sure the envelope protection is inhibited below 100ft RA on approach but I don't have the FCOM in front of me right now.

I had the aircraft configured properly for landing...spoilers armed, autobrake 1 (I was light), gear down, flaps 25, VREF was about 138 I think. I did float a bit so it's remotely possible the protection kicked in, but I didn't get any sort of annunciation that was the case so I don't think that's what happened.

 

The same thing happened after I went around. Did another circuit and shortly after I touched down, GA was commanded. At that point the baby started crying so I had to pull eject handle (airline option). I've tried this twice since then and haven't had it happen again. One thing to note is I did perform an entire preflight with initialization, speeds, etc. I simply set my route to KATL to KATL with custom waypoints set up for a circuit and then do the rest of the preflight. The only possible thing I can think happen was a controller spike. At the time, I had "IN HOLD ONLY" set for my controller A/T override. I've since switched it to "NEVER." But I did have my throttle at idle. I have the NGX set the same way and have never had issues with spikes causing strange AT behavior. In fact, I think I have the only CH Yoke which literally never has spikes. Plus, I have a small null zone set at idle.

 

I'm going to probably just have to go with this being a one-off occurrence. I haven't seen it since and now that I know the 777 doesn't have any "auto go-around" I'll have to assume it's something I did wrong or was a controller issue.

Haven't experienced that yet during manual landings. Thrust range goes to GA on the EICAS, but there's no TOGA mode on the PFD/FMA I could confirm.