In Nick's (AoA) informative video on YouTube, after takeoff, the pitch model changes from TOGA to ALT at 1,300 ft, with the MCP altitude set at 3,000 ft.  the ALT annunciation has a green box around it, as it should (1:04:05 in the video).  Then, when the aircraft actually captures the 3,000 ft altitude, the ALT annunciation gets another green box around it, even though there is no change in the displayed mode (1:05:04 in video).

 

My understanding is that the green box only appears when there is a change in the mode.  Since the box appeared without a change in the mode, I was wondering if this was perhaps a minor bug.

 

Rushad E.

Accidental double post.  Sorry.

 

Rushad E.

wow very helpful Rigoberto Aranda

I am curious now as well. if the above named could cite his info that would help.

In Nick's (AoA) informative video on YouTube, after takeoff, the pitch model changes from TOGA to ALT at 1,300 ft, with the MCP altitude set at 3,000 ft.  the ALT annunciation has a green box around it, as it should (1:04:05 in the video).  Then, when the aircraft actually captures the 3,000 ft altitude, the ALT annunciation gets another green box around it, even though there is no change in the displayed mode (1:05:04 in video).

 

My understanding is that the green box only appears when there is a change in the mode.  Since the box appeared without a change in the mode, I was wondering if this was perhaps a minor bug.

 

Rushad E.

Accidental double post.  Sorry.

 

Rushad E.

Uh oh. Here we go with the bug contest.

 

I don't recall, but I believe Alt cap to alt hold may be the "change" that triggers the box. Smartcockpit is a great resource if you're curious:

 

http://www.smartcockpit.com/aircraft-ressources/B777-Automatic_Flight.html

ah that's right the mode did change to alt hold, thanks. As for the bug thing, no was just curious

Trevor, not starting a contest here.  Just stating a possible discrepancy so that if real, PMDG can make an outstanding product even more accurate (in a FUTURE release).

 

FYI, the 777 does not have an annunciated ALT ACQ mode, with a transition to ALT HLD, like the 737NG does.  The 777 has only one ALT mode (not counting VNAV ALT, which is not relevant in this case).

 

Rushad

No more 777 Beta videos! Please!!! I want this thing launched this week, no more bug hunting until we all get our hands on it!! :lol: :lol:

Are you suggesting the aircraft left TOGA (Reducing to Climb Thrust etc) at 1,300 ft and went straight into ALT and that it shouldn't change mode between 1300ft to 3000ft to go from a few thousand ft/min climb to 0ft/min?

 

Shouldn't there be some kind of change of mode to differentiate "Climbing really fast" to "Maintaining altitude"?

 

(Don't know, 777 is new to me, I know 767 and 737 well enough... but 777 might be different, but I can't imagine it deciding to quietly not tell the pilots that it's going to stop climbing now, hoping they don't notice.)

There's no ALT ACQ or ALT* pitch mode in the B777 or B744. The ALT mode is a level-off and altitude hold function in one.