737 and VNAV Takeoff

[ImbracableCrunk]

How about a non-political, info-seeking thread?

737 operators, how does your airline use VNAV during takeoff?

Do you wait until 3,000AGL? Do you arm VNAV on the ground? What is your SOP?

Thanks,
IC

 

[GuppyWN]

WN is flaps up. LNAV is/can be armed on the ground.

Gotta watch that autoland though. It's a rough mo fo!

Gup

 

["TheBigPicture"]

CAL:

NADP2 (ICAO B)- 1000' agl

NADP1 (ICAO A)- 1500' agl

 

[dicko]

AirTran:

LNAV is generally armed on the ground and becomes active at 50 feet. VNAV is selected at 1000 feet prior to the "flaps up" call.

CAT3B fully coupled Autoland works like a charm, and usually produces a smoother touchdown than I'm capable of ..... Although that's not really saying much.

 

[redflyer65]

Refusing to answer until we hear Airtran's position on VNAV...and SLI.

Just kidding!

What Gup said.

 

[ImbracableCrunk]

So do you accelerate to 250 after flaps up, or do you wait until 3000AGL (NADP2)?

 

["TheBigPicture"]

If you're referencing the CAL procedure, when in VNAV the speed cursor will drive to the flap limit for the current flap setting minus 5kts. When flaps are selected up it will accelerate to clean maneuver, and at 3000' AFL it will drive to 250...at 10,000 it drives to whatever econ climb is. Procedure is the same for NADP 1, except we don't make any flap retractions until 3000' AFL.

 

[ImbracableCrunk]

When flaps are selected up it will accelerate to clean maneuver, and at 3000' AFL it will drive to 250...at 10,000 it drives to whatever econ climb is.

Are you programming the FMC for that, or is that a default from Boeing for CAL? That would require a SPD REST of some sort, right?

Thanks for the replies, BTW.

 

["TheBigPicture"]

Are you programming the FMC for that, or is that a default from Boeing for CAL? That would require a SPD REST of some sort, right?

Thanks for the replies, BTW.

Set up that way, no programming req'd...that's what the computer nerds are for

actually there is one exception, on the NADP 1 we have to manually change the Acceleration Ht on the Takeoff Ref page 2/2 to 3000'

 

[ImbracableCrunk]

What prevents the plane from going to 250 after the flaps are up and below 3,000AGL?

 

[densoo]

How about a non-political, info-seeking thread?

737 operators, how does your airline use VNAV during takeoff?

Do you wait until 3,000AGL? Do you arm VNAV on the ground? What is your SOP?

Thanks,
IC

VNAV is a maneuver that is part of a global socialist agenda attempting to control so-called "noise." If the people under the t/o flight path don't like noise they can move somewhere else. That's the free market.

 

[Rough67]

What's VNAV?

 

[GuppyWN]

What's VNAV?

It's a function of automation that when coupled with the autopilot and poor technique that will pull 3g's in transition as the pilot flying shakes his head and curses "the jet."

Gup

 

[EatinRamen]

At my airline...

Prior to takeoff, go to CLIMB page and set speed to 210kts or 220kts (depending on weight), as well as changeover altitude (Field elev + 3,000). Then reset your climb speed to 250KTS. (You can only input speeds in the climb page after you've entered a ZFW on the INIT REF page.)

After t/o, at 1,000AGL, we call "VNAV, Flaps 1"

Out of 10,000' the PF asks the PM to select ECON CLIMB on the CLIMB page to accelerate.

 

[CA1900]

It's a function of automation that when coupled with the autopilot and poor technique that will pull 3g's in transition as the pilot flying shakes his head and curses "the jet."

:laugh:

Perfect!