Speed limit, LE flaps and slats
Thread Starter
Joined: Jul 2006
Posts: 123
Likes: 0
From: Norway
Speed limit, LE flaps and slats
Hey guys
We have a speed restriction on the 737-800 on departure of 230 kts. with the LE flaps and slats extended.
On approach you may extend the LE flaps and slats if you're below 250 kts.
Why is there different speeds here?
Is it because the LE flaps and slats can only handle 230 kts. during retraction?
We have a speed restriction on the 737-800 on departure of 230 kts. with the LE flaps and slats extended.
On approach you may extend the LE flaps and slats if you're below 250 kts.
Why is there different speeds here?
Is it because the LE flaps and slats can only handle 230 kts. during retraction?
Joined: Feb 2006
Posts: 112
Likes: 0
From: UK
Who are "we" ?
- mainly as i havnt heard of that one before, on a normal departure...
- normally wouldnt go there anyway, but guess what the "approx" min clean speed is for NG max T/O mass.
- is it "only" a company recommendation / SOP, or is it listed in the limitations chapter.
- what does your speed tape say, (the red bar)
- what does Vnav command on flap retraction...( if you use it)
- mainly as i havnt heard of that one before, on a normal departure...
- normally wouldnt go there anyway, but guess what the "approx" min clean speed is for NG max T/O mass.
- is it "only" a company recommendation / SOP, or is it listed in the limitations chapter.
- what does your speed tape say, (the red bar)
- what does Vnav command on flap retraction...( if you use it)
Joined: Mar 2001
Posts: 4,562
Likes: 33
From: I wouldn't know.
The 230kts until retracted is a boeing recommendation and VNAV schedules 230 until all leading edge devices are retracted. It is done to cover a possible stuck flap situation and keep within the speed limitation for that case. During approach one is usually decelerating and therefore the airspeed is decreasing anyway. However even in that case boeing recommends to select the next flap setting only 10kts above the current flap limit speed, which for example means flaps 1 at speed up plus 10kts.
