Shamrock1Heavy
Topic Author
Posts: 242
Joined: Sat Nov 09, 2002 8:46 am

Landing Gear Questions

Thu Feb 06, 2003 10:47 am

Hi - My instructor was only limited to knowlage of small twin engine prop gears....so here it goes

On a large transport jet (i.e - 747, 777, A330,A340 etc..) When is the gear extended? When the hit that V speed (is it Vle?) ? On final? or trying to bleed speed off trying to slow down before landing? I am talking like genrally, Like a normal flight, at a large airport...

Thanks!

-D
when in hell, we'll do shots at the bar
 
AAR90
Posts: 3140
Joined: Fri Jan 21, 2000 11:51 am

RE: Landing Gear Questions

Thu Feb 06, 2003 11:46 am

Whenever I need it.  Laugh out loud
Seriously, I try to hold lowering the gear as long as possible --saves fuel-- but have found the 738 needs the gear's drag a lot more often than I'd like. If possible, my goal is to lower the gear such that the landing checklist is completed exactly as we pass 1000' AGL (a checklist required callout of "checklist complete"). Anything earlier than that costs fuel ($$$).
*NO CARRIER* -- A Naval Aviator's worst nightmare!
 
CX Flyboy
Posts: 6030
Joined: Sun Dec 26, 1999 6:10 pm

RE: Landing Gear Questions

Thu Feb 06, 2003 12:03 pm

The landing gear can be useful in helping to slow down when you don't want to use the spoilers. However, usually I lower the gear in the 777 at around 2300ft AGL on finals. We cannot lower flap 30 until the gear is down otherwise we get a warning. In order to have Flaps 30 and landing checkilst complete at around 1500 (1000 latest) I lower the gear at around 2300. On some days however, in a heavy -300, without the gear the speed increases as we go down the glideslope, even with thrust at nearly idle. Putting Flaps 20 out early may not be enough to slow the speed so the gear goes out earlier than I would normally do it.

In some places like Tokyo Narita's Runway 34 approach, you are required to put the gear out very early (Over the sea), to prevent blocks of ice from falling down on houses. Not sure how much of a problem this really is, but the approach plate says to do it, so we do.
 
ScooterTrash
Posts: 553
Joined: Thu Aug 02, 2001 10:39 am

RE: Landing Gear Questions

Sat Feb 08, 2003 12:32 pm

In my lowly Dash 8, the gear is a major slow down tool, since Vlo is higher than Vfe at any flap setting. With that said, I try to hold the gear up until 1500' AGL on a instrument approach and 1000' on a visual, just to keep things smooth and quiet for the folks.
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: Landing Gear Questions

Sat Feb 08, 2003 2:32 pm

Cx_flyboy
U said...
We cannot lower flap 30 until the gear is down otherwise we get a warning.

Shouldn't u get that Ldg Config horn at flaps 25 as well, or is it different in the B777-300s?

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