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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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