Can anyone enlighten me on the difference, please(that is, when would I consult one speed table, when the other?)?Flap Retraction Speeds:My flight manual has a table called Flap Retraction Speed Schedule, which is fairly familiar to me. At least, I understand the instruction to set Flap 1 @ V2 + 15, although I am unsure about how to set Flaps Up @ Vm Flaps 1?After Takeoff Maneuver Speeds(Vm):May be that is where the second table, After Takeoff Maneuver Speeds (Vm) comes in?It instructs Flap 1 @ Vm Flaps 1 Speed Bug, for example. This is a reference to the flap speeds set on the speed tape, I take it (although the table calls them fixed speeds)?Both schedules refer to Vm. How do I determine this? It is available on the speed tape, so I guess it

Pretty straight forward, for the 600-700 flaps 1 or 5. If 5 then you can retract to 1 at V2 +15 (which happens rather quickly) then at flap retraction altitude retract full. Depending on how you handled your TO -If you selected a pitch mode but not VNAV in TOGA, LVL CH kicks in and will advance 20 extra knots than V2 upon engagement, at retraction altitude set speed to flaps up

Thanks for the useful information, Randy.I wasn't clear in what I was asking. I'm not(for the moment) concerned with when or what flaps to set, but, to put it crudely, the question why we need a Flaps Maneuvring Speeds Table, at all? Haven't I got all the information I need from the Flap Speed Retraction Table? And how do you define 'maneuvring'?Best wishes,Frank

Hi Frank,"maneuvring" is normally meaning that at "that" speed you have enough control authority to maneuver the aircraft (that is: you have enough rudder/ailerons/elevator authority to control yaw/roll/pitch). If I remember well, the VM should be 1.2 or 1.3 the V stall with that configuration/weight.You set Flaps Up when passing (accelerating through) VM Flaps 1, because of the 737NG wing design (read the note just under the 700/800/900 table).I assume that while flaps are retracting, your airplane will be accelerating through the next VM (Flaps zero) speed.The VM Flap xx degrees speed are variable and calculated by the FMC. The manual calls them "fixed" because they are not as in the other 737 series (see the previous table in the same page) "variable" with gross weight (indeed, they DO vary with gross weight, but this is calculated by the FMC).Hope this was not too confusing !PS: check you yahoo e-mail, I sent you a checklist I prepared and I would like to have your opinion, if you have some spare time...thanks.Best regards.Enrico.

>Hi Frank,>"maneuvring" is normally meaning that at "that" speed you have>enough control authority to maneuver the aircraft (that is:>you have enough rudder/ailerons/elevator authority to control>yaw/roll/pitch). If I remember well, the VM should be 1.2 or>1.3 the V stall with that configuration/weight.>You set Flaps Up when passing (accelerating through) VM Flaps>1, because of the 737NG wing design (read the note just under>the 700/800/900 table).I assume that while flaps are>retracting, your airplane will be accelerating through the>next VM (Flaps zero) speed.>The VM Flap xx degrees speed are variable and calculated by>the FMC. The manual calls them "fixed" because they are not as>in the other 737 series (see the previous table in the same>page) "variable" with gross weight (indeed, they DO vary with>gross weight, but this is calculated by the FMC).>Hope this was not too confusing !>PS: check you yahoo e-mail, I sent you a checklist I prepared>and I would like to have your opinion, if you have some spare>time...thanks.>Best regards.>Enrico. I thought "manuevering Speed" was the speed that would allow you to fly in very turbulent air conditions without overstressing the aircraft.

Hi,the speed you are referring to is the "turbulent air penetration speed" that for the 737NG (700 to 900) is Mach 0.76 or 280 KIAS.Greetings.

Thanks, Enrico.Have replied on checklists. Will reply further on this by email.BR,Frank