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Departure airport and runway given, thrust limits set, perf init set, flaps value 10, CG 21% set - still FMC do not calculate V speeds and trim value.

What am i doing wrong ?

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Hi.  Check the options.  There is an option for FMC calculated V speeds

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Departure airport and runway given, thrust limits set, perf init set, flaps value 10, CG 21% set - still FMC do not calculate V speeds and trim value.

What am i doing wrong ?

 

Are your ADIRUs (inertial navigation) aligned?

 

Mike

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1) Check perf init... make sure data is inserted, complete and correct.

 

2) insert cg on takeoff ref... assuming CDU preflight is done correctly, you will get v speeds like everyone else

 

3) if all else fails, fly the tutorial.

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You also need a departure runway defined.

 

I assume you have not seen V-SPEEDS UNAVAILABLE which means you are outside the envelope of the aircraft.

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I assume you have not seen V-SPEEDS UNAVAILABLE which means you are outside the envelope of the aircraft.

 

^^If you select a derate and is too heavliy loaded v-speeds will be unavailable

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Also, make sure you hit the LSK 1L next to Gross Weight in the Performance page. This happened to me last night. Since I'm used to flying the NGX, I tried to go and enter a ZFW. On the queen however, the ZFW is already pre-populated. Instead you have to verify the Gross Weight indication by pressing LSK 1L. After doing this, the V-speeds appeared.

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Also, make sure you hit the LSK 1L next to Gross Weight in the Performance page. This happened to me last night. Since I'm used to flying the NGX, I tried to go and enter a ZFW. On the queen however, the ZFW is already pre-populated. Instead you have to verify the Gross Weight indication by pressing LSK 1L. After doing this, the V-speeds appeared.

I had the OP's problem and this fixed it for me. Recommend check this

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And I think that varies by aircraft/operator configuration? Tonight I flew the United -400 and I had to confirm the GW value, I'm pretty sure I didn't have to do that in the Cathay Cargo -400F last night.

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Had the same problem, KORDATC was spot on, thanks mate.

Paul Findlayson

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Yeah, this is one that catches people out on a number of occasions.

Don't pencil-whip your pre-flight. Go through your normal procedure, but make sure you're paying enough attention to the info being shown to you. The GW will have a < next to it, meaning that it needs to be confirmed. Slow down, don't rush. Be one with the airplane.

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On ‎2‎/‎1‎/‎2017 at 5:28 PM, KORDATC said:

Also, make sure you hit the LSK 1L next to Gross Weight in the Performance page. This happened to me last night. Since I'm used to flying the NGX, I tried to go and enter a ZFW. On the queen however, the ZFW is already pre-populated. Instead you have to verify the Gross Weight indication by pressing LSK 1L. After doing this, the V-speeds appeared.

For a long time I configured PMDG 747 v3 FMC entering ZFW by hand and now I found after loaded the bird the fuel is already populated. Thanks to your post I hit the LSK 1L once and the number looks larger font telling me is loaded and then the V-speeds appear as expected. I don't remember if because I installed later the 737NGX? It doesn't happen with PMDG 777

Is there a way to leave Performance Page not populated? Or is this the way how 747 looks like?

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Posted (edited)
53 minutes ago, trisho0 said:

Is there a way to leave Performance Page not populated?

Yes and no...because:

53 minutes ago, trisho0 said:

Or is this the way how 747 looks like?

Depends on the equipment option that the aircraft has. Some planes are equipped with weight sensors that detect the weight. The pilot simply confirms it by clicking on the GW (or over-writing it). Please be sure to read the Intro Manual (hint: page 84, right in the middle).

Edited by scandinavian13

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Posted (edited)
1 hour ago, scandinavian13 said:

Yes and no...because:

Depends on the equipment option that the aircraft has. Some planes are equipped with weight sensors that detect the weight. The pilot simply confirms it by clicking on the GW (or over-writing it). Please be sure to read the Intro Manual (hint: page 84, right in the middle).

Hello Kyle, thanks for giving me a great help. I think am going to confirm the GW which is quicker. Now I am learning about Flight Plan tool, new for me. Also, I will take a look at PMDG 747 v3 page 84 from Operation Center.

Just taken a look at the manual page 84 and realized there is a list of 22 pages with options. I found the Weight Balance System very interesting to learn about. So, to confirm GW and the V-speeds will be updated. Cool!

Edited by trisho0
completing sentence

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On ‎2‎/‎1‎/‎2017 at 10:28 PM, KORDATC said:

Also, make sure you hit the LSK 1L next to Gross Weight in the Performance page. This happened to me last night. Since I'm used to flying the NGX, I tried to go and enter a ZFW. On the queen however, the ZFW is already pre-populated. Instead you have to verify the Gross Weight indication by pressing LSK 1L. After doing this, the V-speeds appeared.

Cheers. Spent an hour on this !

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