Hi guys.I always put my headwind component into the WIND CORR. line on APPROACH PAGE, then I go to the LEGS page, pick up the speed on the RNW10 line, add by 5 and put on my MCP SPD.But I just found there's a disagreement between the calculated speed on LEGS page and the manual calculation.So, let's suppose I have a 8kts headwind and my Vref (no wind correction yet) is 145. So I divide 8 by 2 and add 145. That would be 149. But my LEGS page usually show a higher value.Which of them (manual or automatic calculation) should I use?And another little question: My speed over the treshold is VREF+5 or VREF? The manual says VREF is runway treshold speedThanks,

Sorry. I was handing out misleading information.

I've been wondering about this too. When I select the approach ref page in the FMC it gives me a certain Vref speed based on my flaps setting. Is this the speed which should be entered into the MCP?-Mikkel

Yep, added by wind correction + 5 KTS

Yes it says wind corr. 5kts. down under it, but I'm not supposed to add 5kts. to the number given to me up above right?-Mikkel

Mikkel,You always add 5kts to Vref even if there's no wind. If you got more wind just keep on adding the wind correction (max. being 20kts), as per Manual section 3 page 7.Regards,Markus

Okay, so if the number on the APPROACH page for a flaps 30 landing says 148, I should enter 153 in the MCP? This is a target speed - correct? What about the Threshold speed then, I have never really understood this. Maybe I should mention I'm doing an autoland.-Mikkel

If you're doing an autoland, just put Vref+5: no wind correction at all. I think there's no treshold speed, so use Vref+5+wind correction if you're landing manual.

If you are doing a manual landing, you should bleed off the speed additive so that you are at Vref at the threshold (at a height of 50 feet above it). Landing distances are based on being at Vref at the threshold.Don S.

I heard that you put your throtlle to idle (50AGL) with Vref+5 and a perfect landing would lead to touchdown at Vref.So the correct procedure is to slow the speed to Vref before passing the treshold (and land with a speed > Vref), or to put you thrust to idle and land with Vref (bleeding the additional off on the flare)?

From the standpoint of how the airplanes are certified for landing distance, the "correct" procedure would be to cross the threshold at Vref and conduct a normal flare and thrust reduction (thrust levers to idle around 50 feet, rotate to about 5 degree nose up pitch at around 30 feet). This will bleed off additional speed, putting you below Vref at touchdown.Some operators' procedures may differ from this. For example, one major operator says to maintain the gust additive (up to a maximum of 20 knots) at the threshold, then conduct a normal flare.Don S.

Oooops, you mean I have to bleed off the wind correction also? That would be safe if you have a strong headwind (that would reduce your speed pretty fast)?

Yes, you should gradually bleed off the wind correction during the final approach to be at Vref at the 50 foot height over the threshold in order to achieve the certified landing distance.Don S.

So if I was making a full autoland the speed on my MCP should be the same as the number shown in the FMC without the added 5 kts.-Mikkel

LANDING BRIEFINGWIND CORRECTIONS FINAL APPROACH