The PFD shows flap maneuvering (Vman) speeds at both takeoff and landing modes. I'm confused as to what the 'UP' maneuvering speed is displayed for though. For instance, at takeoff flap setting of 5, the PFD displays Vman 5, Vman 1, and the 'UP' speeds. Do I retract from flaps 5 to flaps 1 at Vman 5, then go flaps 1 to flaps 0 at Vman 1? If so, what does the UP maneuvering speed indicate in terms of pilot information? Conversely, on approach, do I lower flaps at the correpsonding Vman speeds, i.e. 1, 5 , 10, 15, ect? Again, I can't figure out what exactly the UP speed reference signifies if I understand the flaps schedules display.Thank you.

Hi James,The UP speed is the minimum speed at which you should continuously fly without any flaps, also known as the "clean speed". It's mostly used in the initial stages of an approach.When taking off with flaps at 5, the PFD should not display Vman5; this is a known bug and I believe is fixed in SU2. Back to the takeoff, when you start to accelerate away from V2+20, set flaps 1. When you reach Vman1, set flaps up and accelerate to the UP speed or beyond.Before initial approach, slow to and maintain the UP speed. When ready to intercept the final approach course, set flaps 1, and decelerate. Set flaps 5 when reaching Vman1, and slow to and maintain the Vman5 speed. One dot above the glideslope, select gear down, set flaps 15 and slow to Vman15. When on the glideslope, set flaps 30 and slow to your Vref+x speed.Hopefully this makes sense!

Thank you. I am 'internalizing' your reply, I do believe I'm starting to understand though now, I appreciate the explanation.

Neil is correct about it being fixed in SU2. This also goes for landing flaps. Really neat stuff..[h4]Best Wishes,Randy J. Smithhttp://img.villagephotos.com/p/2003-5/196432/winglets_lg.jpg

Just to clarify this maneuvering speeds and ref speeds thing.To begin with, I have to tell you that I am not sure about HOW things are supposedly done in the NG, but what I do know that Boeing aircraft share commonality in terms. Here's how the 757 works. (And I strongly believe NG as well, someone correct me if I'm wrong)There's only ONE reference speed to be called Vref and that is Vref30 or Vref. This speed is the landing reference speed. One should be touching down at this speed with flap30 configuration. One should NEVER go below Vref, not ever. The reference speeds for different flap positions are always MINIMUM speeds (Maneuvering speeds) for the present configuration. For example, the maneuvering speed for FLAP1 is the speed you must never go below in FLAP1 configuration. Ok, now here's something interesting as well. IF you are to accelerate continuously, you can SELECT the next lower flap setting 20 KIAS BEFORE the maneuvering speed for the next setting. This is because, when you select it 20KIAS before, you will be AT the maneuvering speed, when the flap setting is actually active. Flap transit takes time. This is done to enhance the climb profile, saves gas to make it simple :).Similarly, when you deccelerate, you CAN (although you rarely will) select the next higher flap setting 20 KIAS before the maneuvering speed for the PRESENT setting. Again, the idea is to reach the actual maneuvering speed in the right config. Rarely ever are you able to maintain constant decceleration through the profile, so this method is not widely used.The speeds for the 757. This table uses the "20KIAS BEFORE" -rule in the acceleration part, because it is always used, BUT uses the actual maneuvering speeds in the decceleration part, because it is mostly used.passing ACCEL DECCEL man.spd:Vref (Vref30) FLAP30Vref+20 Select FLAP5 Select FLAP30 F15/20Vref+40 Select FLAP1 Select FLAP15/20 FLAP5Vref+60 Select FLAP UP Select FLAP5 FLAP1Vref+80 Select FLAP1 CleanSo here you can see, that we are selecting the LOWER flap position 20 KIAS before its actual maneuvering speed when accelerating after takeoff, and using the actual maneuvering speeds in decceleration. This is everyday practise.edit: sorry about the plain text format. Couldn't write the table with HTML.Tero

Landing VREF is either for 30 or 40 flaps on the NG and is selected from the APP REF page on the FMC which sets the correct BUGS. VREF for the NG is always VREF + 5 by default and is used unless there is more wind correction needed. The pilot has the option to input 0-20 knots manually on the APP REF page. [h4]Best Wishes,Randy J. Smithhttp://img.villagephotos.com/p/2003-5/196432/winglets_lg.jpg

Tero, thank you very much for taking the time to type out those flaps schedules! Your explanation perfectly clarifies everything I was confused about. I'm printing out your flap schedule table right this moment in fact. Thanks again!