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Delta Virtual Airlines Water Cooler | Airline Operations | VNAV question
DVA7752
First Officer, B747-400
OLP

Joined on August 21 2009
50 State Club
DVA Five-Year Anniversary
Online Double Century Club
Toulouse Century Club
Quatercentenary Club

"Turbulence just makes you have to go worse..."
Parker, CO USA

411 legs, 942.0 hours
246 legs, 564.4 hours online
389 legs, 904.0 hours ACARS
17 legs, 27.3 hours event
 Posted onPost created on January 03 2014 17:29 ET by Greg Stark
When I try using VNAV, I engage autopilot then select VNAV, but the vertical speed always seems to sky rocket far too steep for a typical climb. How can I fix it so that VNAV climbs a little more gradually?

Thanks in advance for the help!


DVA3665
Senior Captain, B777-200
OLP

Joined on October 27 2006
Online Triple Century Club
DVA Five-Year Anniversary
50 State Club
Everett 250 Club
Quatercentenary Club

Plantation, FL

415 legs, 1,407.3 hours
389 legs, 1,330.8 hours online
414 legs, 1,406.3 hours ACARS
5 legs, 20.8 hours event
5 legs dispatched, 10.8 hours
 Posted onPost created on January 03 2014 17:39 ET by Benton Wilmes
What aircraft? What vertical speed? What altitude?

Benton Wilmes

Senior Captain, B777-200
DVA7752
First Officer, B747-400
OLP

Joined on August 21 2009
50 State Club
DVA Five-Year Anniversary
Online Double Century Club
Toulouse Century Club
Quatercentenary Club

"Turbulence just makes you have to go worse..."
Parker, CO USA

411 legs, 942.0 hours
246 legs, 564.4 hours online
389 legs, 904.0 hours ACARS
17 legs, 27.3 hours event
 Posted onPost created on January 03 2014 17:43 ET by Greg Stark
747. Im talking about climbout after takeoff. the vertical speed goes up to like 5000fpm, unless I'm doing it wrong...


DVA3665
Senior Captain, B777-200
OLP

Joined on October 27 2006
Online Triple Century Club
DVA Five-Year Anniversary
50 State Club
Everett 250 Club
Quatercentenary Club

Plantation, FL

415 legs, 1,407.3 hours
389 legs, 1,330.8 hours online
414 legs, 1,406.3 hours ACARS
5 legs, 20.8 hours event
5 legs dispatched, 10.8 hours
 Posted onPost created on January 03 2014 17:48 ET by Benton Wilmes
That's nothing too crazy. People tend to think aircraft climb out at like 2000 fpm max but thats just not true. Now if you are fully loaded, that won't happen but a lightly loaded "heavy" aircraft (747, 777, etc...) climb amazingly well with all that power they have with those engines.

Most airliners won't ever exceed 20 degree pitch just to keep the passengers comfortable so as long as you are staying below that, everything is normal.

Benton Wilmes

Senior Captain, B777-200
DVA2701
Senior Captain, B777-200
OLP

Joined on November 21 2005
50 State Club
Everett 500 Club
Million Mile Club
Globetrotter
Online Nine Century
Millennium Club
DVA Fifteen-Year Anniversary

Denver, CO

1,041 legs, 3,309.1 hours
997 legs, 3,153.7 hours online
1,020 legs, 3,263.5 hours ACARS
21 legs, 38.4 hours event
 Posted onPost created on January 03 2014 18:35 ET by Dean Shultz
We just had a FedEx B77L climbing like a rocket at work. The controller asked him his climb rate. 5950/min.


DVA7752
First Officer, B747-400
OLP

Joined on August 21 2009
50 State Club
DVA Five-Year Anniversary
Online Double Century Club
Toulouse Century Club
Quatercentenary Club

"Turbulence just makes you have to go worse..."
Parker, CO USA

411 legs, 942.0 hours
246 legs, 564.4 hours online
389 legs, 904.0 hours ACARS
17 legs, 27.3 hours event
 Posted onPost created on January 03 2014 23:10 ET by Greg Stark
Ok, but I lose speed when I start climbing like that, so what should I change in that case?


DVA3665
Senior Captain, B777-200
OLP

Joined on October 27 2006
Online Triple Century Club
DVA Five-Year Anniversary
50 State Club
Everett 250 Club
Quatercentenary Club

Plantation, FL

415 legs, 1,407.3 hours
389 legs, 1,330.8 hours online
414 legs, 1,406.3 hours ACARS
5 legs, 20.8 hours event
5 legs dispatched, 10.8 hours
 Posted onPost created on January 03 2014 23:35 ET by Benton Wilmes
Are you flying the PMDG or what model? The whole point of VNAV is to climb via a calculated path from the FMC with a set thrust and adjusting the vertical speed to maintain the determined climb speed. It's very similar to LVL CHG mode but not exactly the same.

Benton Wilmes

Senior Captain, B777-200
DVA7752
First Officer, B747-400
OLP

Joined on August 21 2009
50 State Club
DVA Five-Year Anniversary
Online Double Century Club
Toulouse Century Club
Quatercentenary Club

"Turbulence just makes you have to go worse..."
Parker, CO USA

411 legs, 942.0 hours
246 legs, 564.4 hours online
389 legs, 904.0 hours ACARS
17 legs, 27.3 hours event
 Posted onPost created on January 04 2014 00:21 ET by Greg Stark
it's the fleet 747


DVA7752
First Officer, B747-400
OLP

Joined on August 21 2009
50 State Club
DVA Five-Year Anniversary
Online Double Century Club
Toulouse Century Club
Quatercentenary Club

"Turbulence just makes you have to go worse..."
Parker, CO USA

411 legs, 942.0 hours
246 legs, 564.4 hours online
389 legs, 904.0 hours ACARS
17 legs, 27.3 hours event
 Posted onPost created on January 04 2014 14:42 ET by Greg Stark
Actually the VNAV doesn't even seem like it is engaged. I can push up and down on the yoke at change the pitch freely.


DVA2784
Senior Captain, B777-200
OLP, COMM, 737-ATP

Joined on January 01 2006
50 State Club
Globetrotter
Online Double Century Club
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US Mountaineer Club
Everett 1500 Club
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Four Million Mile Club

"The PAST...learn from it or repeat it."
Highland Home, AL USA

2,309 legs, 9,795.2 hours
243 legs, 873.7 hours online
2,036 legs, 8,583.4 hours ACARS
22 legs, 51.7 hours event
0 legs dispatched, 0.5 hours
 Posted onPost created on January 05 2014 21:27 ET by Rob Morgan
It's a known limitation. Appendix 6 of the 747 AOM discusses a work around.

Rob Morgan

Senior Captain, B777-200
DVA7752
First Officer, B747-400
OLP

Joined on August 21 2009
50 State Club
DVA Five-Year Anniversary
Online Double Century Club
Toulouse Century Club
Quatercentenary Club

"Turbulence just makes you have to go worse..."
Parker, CO USA

411 legs, 942.0 hours
246 legs, 564.4 hours online
389 legs, 904.0 hours ACARS
17 legs, 27.3 hours event
 Posted onPost created on January 05 2014 23:25 ET by Greg Stark
Thanks Rob! I'll take a look at that.



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