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how to get more realistic approach speeds

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Hi all I am having problems with my PIC/POSKY 767 to fly the correct approach speeds. i am using Lee's merge so it has the PIC airfile but when testing it at differrnt weights the approach speeds on final are far too high when compared to the performance tables supplied by Warren from POSKY. for instance at a weight of 254,000lbs the approach speed,according to the tables I have indicate a speed of roughly 130 knots. I am seeing about 155 knots in my aircrft which seems much to high. I am not using any weather so as not to factor in winds. can someone tell me do I have to increase the flpas lift, parasitic drag, wwhatever- appreciate any help with this one as I am not that famliar with editing aircraft.cfg files and don't want to screw things up.

Do you mean that the tables state 130 knots when the FMC says 155?Martin767 fetishistIt's a lot like life and that's what's appealing

What do you mean by "seeing about 155"? Airplanes do not settle onto any speed on approach on their own, you as the one manipulating the controls, direct them to whatever speed you want. Is your question actually perhaps you think the aircraft feels like stalling at 130kts?

At a weight of 254k ,the FMC should give you roughly 130kts VREF for flaps 30, where are you coming up with 155kts?

*SIGH*Never mind.

well guys do i feel like a bonehead- i let the darn plane do an autoland to test the numbers at it flew in at an approach speed over the treshold at 133knts at a weight of 256,000 about right where my tables say it should- obviously the problem was with the $%$#@pilot flying the thing. the only thing i noticed was that the plane was pitched up at an attitude of about 4-5 degrees which is proabably a little high but i think if i increase the lift on the flaps a bit this should fix that- well back to more practice landings!!

  • Commercial Member

At the risk of sounding of nosey, I feel that you are using an incorrect landing procedure.The speeds (Vref etc) aren't speeds you see when performing an action, they are speeds you aim for. On a normal approach, you would have flaps full at an approach speed of Vref + 5 knots (let's keep gusting winds out of this one). Your tables should show the same numbers as the FMC computes, provided you enter the correct Zero fuel weight or gross weight into it.To see how everything adds up, try setting up an automatic landing. Use the autothrottle to maintain speed, and note, while performing an autoland, Vref + 5 is not required. Vref will do just fine. Your pitch should be around 3 degrees nose up. Learn from the autopilot! After a few manual landings you'll beat the darn computer ;-)Good luck!Mark

Mark Foti

Author of aviaworx - https://www.aviaworx.com

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