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A3204eva
Topic Author
Posts: 1041
Joined: Wed Feb 18, 2004 4:25 am

747 - Gear Up....

Wed Aug 24, 2005 11:30 pm

Ok, Most aircraft put their gear up once they have a positive climb, but the 747 even when it has a positive climb seems to wait a little longer to retract the gear... why is this?

any 747 pilots out there I would love to hear from U!

cheers,
Scott
"They have lady pilots......... they're not that good, but they have 'em"
 
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HAWK21M
Posts: 30120
Joined: Fri Jan 05, 2001 10:05 pm

RE: 747 - Gear Up....

Thu Aug 25, 2005 9:10 pm

Quoting A3204eva (Thread starter):
but the 747 even when it has a positive climb seems to wait a little longer to retract the gear.

Never noticed this really.If its a rare occasion I would attribute it to brake cooling.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
air2gxs
Posts: 1443
Joined: Mon Jun 18, 2001 1:29 pm

RE: 747 - Gear Up....

Thu Aug 25, 2005 9:25 pm

I've jumpseated on many B747's and the gear always goes up at the same time; when the PF says "gear up".
 
A3204eva
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RE: 747 - Gear Up....

Thu Aug 25, 2005 11:12 pm

They always seem to take longer tho.. here's a vid from FL350 http://www.flightlevel350.com/viewer.php?id=3706 . If you look at any 747 takeoff vid they always take a while to retract the gear...

Thx for the replies  Smile
"They have lady pilots......... they're not that good, but they have 'em"
 
PhilSquares
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RE: 747 - Gear Up....

Thu Aug 25, 2005 11:44 pm

I can assure you as soon as there is a "positive rate" there is a call for the gear up! However is you look closely at the clip, you'll see the first thing that happens is the gear doors open and then retraction begins. The gear door opening doesn't happen very quickly and that is why you get the impression there is some sort of delay.
Fly fast, live slow
 
highflyer9790
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RE: 747 - Gear Up....

Fri Aug 26, 2005 4:29 am

The 747's gear system is not old, but on the other hand, it isn't new. take a look at these takeoffs in the clip. gear is retracted at the same time, but the doors& wheels mover quicker on different aircraft.

http://www.flightlevel350.com/viewer.php?id=4139
121
 
DH106
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RE: 747 - Gear Up....

Fri Aug 26, 2005 4:24 pm

Slightly off topic - but has anyone else noticed that the DC-10's retraction sequence differs from most others (certainly all Boeing I've seen) in that the gears begin to pivot inwards BEFORE the door is established fully open. The door however does seem to open faster than most. It seems that the gear and the door start moving together - the gear slower so that it doesn't foul the opening door.

This presumably is done to minimise the total retraction time ?

Are there any protection mechanisms to stop the gear retracting if the door fails to open ? On other airliners I believe that the retraction hydraulics are sequenced so that the gears only move when the doors reach their 'open' limit switches.

Any comments ?
...I watched c-beams glitter in the dark by the Tanhauser Gate....
 
Mr.BA
Posts: 3310
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RE: 747 - Gear Up....

Fri Aug 26, 2005 4:38 pm

I suppose "Gear-Up" is called after the "Positive Rate of Climb"? I noticed B747s near MTOW retract their gears as soon as after lift-off... does the calls come much earlier thatn those that are lighter or pilots retract the gears earlier to minimise drag?

Thanks!
Boeing747 万岁!
 
jeffry747
Posts: 909
Joined: Thu Jun 30, 2005 6:26 pm

RE: 747 - Gear Up....

Sat Aug 27, 2005 4:59 pm

Quoting DH106 (Reply 7):
gears begin to pivot inwards BEFORE the door is established fully open.

I have noticed this not only on the DC-10, but EVERY McDonnell-Douglas commercial jet aircraft. Yup, the DC-8s, DC-9s, MD-11s, and MD-80s all do that.
C'mon Big B, FLY!
 
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HAWK21M
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RE: 747 - Gear Up....

Sat Aug 27, 2005 5:44 pm

Observed many B747s on T/O last night at work.Found them to be retracting at almost the same speed.Although the mvmt seemed slower than smaller jets retraction speed.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
DH106
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Joined: Wed Jun 15, 2005 5:32 pm

RE: 747 - Gear Up....

Sat Aug 27, 2005 5:45 pm

Quoting Jeffry747 (Reply 9):
I have noticed this not only on the DC-10, but EVERY McDonnell-Douglas commercial jet aircraft. Yup, the DC-8s, DC-9s, MD-11s, and MD-80s all do that.

Yes - you're quite right Jeffry747  Smile
Here a good shot of a DC-8 showing this:-

https://www.airliners.net/open.file/893404/L/
...I watched c-beams glitter in the dark by the Tanhauser Gate....
 
A3204eva
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Posts: 1041
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RE: 747 - Gear Up....

Sun Sep 04, 2005 12:36 am

Thx for the info guys  Smile

Scott
"They have lady pilots......... they're not that good, but they have 'em"
 
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HAWK21M
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Joined: Fri Jan 05, 2001 10:05 pm

RE: 747 - Gear Up....

Sun Sep 04, 2005 1:16 am

Quoting DH106 (Reply 10):


View Large View Medium
Click here for bigger photo!

Photo © Michael Van Bosch


Why the red border on the RH Side Window.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
XFSUgimpLB41X
Posts: 3961
Joined: Fri Aug 25, 2000 1:18 am

RE: 747 - Gear Up....

Sun Sep 04, 2005 3:33 am

Thats an emergency exit....
Chicks dig winglets.
 
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HAWK21M
Posts: 30120
Joined: Fri Jan 05, 2001 10:05 pm

RE: 747 - Gear Up....

Sun Sep 04, 2005 6:14 pm

Quoting XFSUgimpLB41X (Reply 13):
Thats an emergency exit....

Agreed.But why is it painted Red.All Airlines dont do it.
Even the B737s out here dont.
regds
MEL
I may not win often, but I damn well never lose!!! ;)

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