Hey T7 pilots, now that I am also an proud owner I have a question about the top of descent. It was calculated way too early.

 

I made a flight from KJFK to EHAM. I trie to explain the waypoint sequence with altitudes calculated by the T7:

 

On my cruise I had two stepclimbs from FL370 to FL 380 and than to FL390.

 

After the T/D symbol on the ND there where 4 waypoints I think before the STAR:

 

T/D

WPT 1 - FL390

WPT 2 - FL390

WPT 3 - FL390 and the next wpt had the first lower alt

WPT 4 - FL380 ...all other wpt had normal descent altitudes.

 

I ignored the calculated T/D and started my own descent with FLCH before WPT4. The VNAV deviation at the end where 14000 ft or so ^^

 

Now I search for the reason of it. I understand VNAV well I think, but I dont know what I have maybe done wrong... maybe you? :-)

 

Thank you!

Winds maybe?

 

 

After the T/D symbol on the ND there where 4 waypoints I think before the STAR:

T/D
WPT 1 - FL390
WPT 2 - FL390
WPT 3 - FL390 and the next wpt had the first lower alt
WPT 4 - FL380 ...all other wpt had normal descent altitudes.

 

I've never seen that... you should have descending crossing altitudes at all waypoints after the TOD symbol.

 

Try this:  Set up another flight at KJFK and enter the same route and preflight the FMS.  Now look at the LEGS pages and find the TOD and see if the same thing happens. Please provide a copy of your flight plan if you can reproduce this with it.

First I also thinked about winds but they where done by ASN and requested before. I dont think it can cause it.

 

@downscc: Will trie this asap!

 

Thank you guys

 

 

WPT 4 - FL380 ...all other wpt had normal descent altitudes.

 

What color was this FL380? White or magenta?

What color was this FL380? White or magenta?

Unfortunately I cant remember... maybe he was white.

What do you think about?

Unfortunately I cant remember... maybe he was white.

What do you think about?

 

I'm guessing something in the nav data called for it (which would be displayed in magenta). Here at IAD, we had a STAR that had people descend pretty early on, level out a bit, and then descend again. I think that part of it has since been revised, but it was definitely one where it pulled you below your cruise alt pretty far out.

At EHAM, there isn't such a restriction. For arrivals from the USA, these are the first altitude restrictions of the STARs:

TOPPA @ FL250B

MOLIX @ FL230B

LAMSO @ FL230B

REDFA @ FL230B

I just flew the LAMS1A into EHAM last night... no problems. Descent started right off the UK coast as expected.

 

Again, please try to reproduce then share the specifics. We're just guess now.