If Markieboy's current type given by his profile is correct (B744) then this FMC certainly does have a LEGS page. I would agree with the other posters that F390S has been entered against a waypoint on that page, and the FMC is being forced up at a position that is 68nm away.

I never flew this type on metric flight levels, and am willing to be corrected, but with FL348 (ie FL10600m) entered as the CRZ level and the step setting to ICAO (ie 4000') would the FMC not plan for the next level to be F388? If this assumption is correct, the explanation that FL390S has been entered manually has even more credence.

Markieboy, did you clear this step by re-entering the CRZ level after you had passed the waypoint that is 68nm away on this picture? I seem to remember that sometimes an unwanted manual step won't clear from the 'Step-to' field after the associated waypoint has been passed even by entering Step 0. The solution was to hold the present altitude, dial a lower one into the MCP, push the button, redial the current altitude and push the button again.

411A, the beloved Tristar was a mighty machine for sure.
Did you know; if you have the intellegence and the time to calculate the antipodean position and enter it as a waypoint, line select it to the top at L1, and as you get directly overhead the opposite point, execute 'direct to' the screen shows about 125 Zeros. Try it some time!
p.s. disconnect LNAV before you try it!

Mr Google has already thought of that :D:D

antipodr - Find the other side of the world!

Ha! It still is, make no mistake.:ok:

Now, as to inapproporiate FMS inputs, yes, quite correct, however....the FD crew really has to try to positively screw-up.
Other aircraft?
Yup, I fully expect so.

I fly the B717 with Bloggs, in fact he taught me some of what I know.

It is not at all uncommon to see the Honeywell FMS in the 717 show a step climb to a higher level is possible in a short distance, yet the MaxFL is thousands of feet below the same level.

On one occasion, I foolishly commenced a climb because OPT & Max were indicated to be achievable, and as soon as the climb was commenced, both Opt & Max indicated below the level on climb to! :eek:

Wow, a 5 day LAX and all this has been posted! Sorry, I should have checked in earlier.

Type is indeed 744. I will check next week wednesday as I am off to Shanghai again. I know many guys use the LEGS page to enter an expected step, I normally don't which is probably why I was confused by this.

FL348 is indeed 10600m, Russian airspace. And Mach .856 is ECON with CI150 which is our normal cruise CI, with delays being flown at CI400.

Many thanks everybody,

Mark