flap deployment

I'd like to get some general information on flap deployment if someone
would be kind enough to provide it.

Is the flap angle normally held constant throughout climb? Ditto for
descent.

If not, what are the typical rules or schedule for changing the flap
angle for a large commercial aircraft? Thanks.

wrote in message
Is the flap angle normally held constant throughout climb? Ditto for
descent.
If not, what are the typical rules or schedule for changing the flap
angle for a large commercial aircraft? Thanks.

The topic can be fairly complicated. Generally speaking, the flaps are
retracted one notch after climbing through somewhere between 800' to 1500'.
The flaps and slats are further retracted as the airplane accelerates.
Climbing with the wing in the 'clean' configuration is most economical.

D.

On a B727, flap retraction is done according to a schedule which correlates
flap settings with airspeed.

For example, with a TOGW of 160,000, temp of 59F, and 15 degrees flaps, V2
is 146 knots. Takeoff is done at Flaps 15. Flaps are then retracted to 5
degrees when reaching "V2 + 10" (156 knots), then retracted to 2 degrees
when reaching "V2 + 40" (186 knots), and fully retracted at "V2 + 60" (206
knots).
Note: When 2 degrees of flaps are used, half of the slats get retracted ,
with the remaining slats (and the Krueger flaps) retracted with a 0 Flap
setting
wrote in message
oups.com...
I'd like to get some general information on flap deployment if someone
would be kind enough to provide it.

Is the flap angle normally held constant throughout climb? Ditto for
descent.

If not, what are the typical rules or schedule for changing the flap
angle for a large commercial aircraft? Thanks.

In article 8hJvg.161350$k%3.95311@dukeread12,
says...
On a B727, flap retraction is done according to a schedule which correlates
flap settings with airspeed.

For example, with a TOGW of 160,000, temp of 59F, and 15 degrees flaps, V2
is 146 knots. Takeoff is done at Flaps 15. Flaps are then retracted to 5
degrees when reaching "V2 + 10" (156 knots), then retracted to 2 degrees
when reaching "V2 + 40" (186 knots), and fully retracted at "V2 + 60" (206
knots).
Note: When 2 degrees of flaps are used, half of the slats get retracted ,
with the remaining slats (and the Krueger flaps) retracted with a 0 Flap
setting

Surely you also calculate your speeds based on a/c weight? (unlike small
aircraft).

--
Duncan

"Dave Doe" wrote in message

For example, with a TOGW of 160,000, temp of 59F, and 15 degrees flaps,
V2
is 146 knots. Takeoff is done at Flaps 15. Flaps are then retracted to 5
degrees when reaching "V2 + 10" (156 knots), then retracted to 2 degrees
when reaching "V2 + 40" (186 knots), and fully retracted at "V2 + 60"
(206
knots).
Note: When 2 degrees of flaps are used, half of the slats get retracted ,
with the remaining slats (and the Krueger flaps) retracted with a 0 Flap
setting

Surely you also calculate your speeds based on a/c weight? (unlike small
aircraft).

Note above, he did mention "...TOGW of 160000..."

Yes, we do (Take Off Gross Weight = TOGW)

And stop calling me Shirley!
"Dave Doe" wrote in message
. nz...
In article 8hJvg.161350$k%3.95311@dukeread12,
says...
On a B727, flap retraction is done according to a schedule which
correlates
flap settings with airspeed.

For example, with a TOGW of 160,000, temp of 59F, and 15 degrees flaps,
V2
is 146 knots. Takeoff is done at Flaps 15. Flaps are then retracted to 5
degrees when reaching "V2 + 10" (156 knots), then retracted to 2 degrees
when reaching "V2 + 40" (186 knots), and fully retracted at "V2 + 60"
(206
knots).
Note: When 2 degrees of flaps are used, half of the slats get retracted
,
with the remaining slats (and the Krueger flaps) retracted with a 0 Flap
setting

Surely you also calculate your speeds based on a/c weight? (unlike small
aircraft).

--
Duncan

"tom418" wrote in message
Note: When 2 degrees of flaps are used, half of the slats get retracted ,
with the remaining slats (and the Krueger flaps) retracted with a 0 Flap
setting

You sure about the Krueger flaps? My library is packed away for remodeling
preventing me from looking it up, but I'm sure only slats 3 &4 are extended
at flaps2, not the Kruegers.

D.

"Capt.Doug" wrote

You sure about the Krueger flaps? My library is packed away for remodeling
preventing me from looking it up, but I'm sure only slats 3 &4 are
extended
at flaps2, not the Kruegers.

Durn it, I was going to let the Krueger flaps go, when he explained it, as
something I really didn't need to know. Now you bring it up again, and now
I want to know! g

What the heck are Krueger flaps?
--
Jim in NC

Flaps the hinge at the bottom from of the leading edge and
swing down to make a more curved section. Slats are
sections of the leading edge that move forward making a
slot.


--
James H. Macklin
ATP,CFI,A&P

"Morgans" wrote in message
...
|
| "Capt.Doug" wrote
|
| You sure about the Krueger flaps? My library is packed
away for remodeling
| preventing me from looking it up, but I'm sure only
slats 3 &4 are
| extended
| at flaps2, not the Kruegers.
|
| Durn it, I was going to let the Krueger flaps go, when he
explained it, as
| something I really didn't need to know. Now you bring it
up again, and now
| I want to know! g
|
| What the heck are Krueger flaps?
| --
| Jim in NC
|

Capt.Doug wrote:
"tom418" wrote in message
Note: When 2 degrees of flaps are used, half of the slats get retracted ,
with the remaining slats (and the Krueger flaps) retracted with a 0 Flap
setting


You sure about the Krueger flaps? My library is packed away for remodeling
preventing me from looking it up, but I'm sure only slats 3 &4 are extended
at flaps2, not the Kruegers.

D.


Doug,

Re-read his statement. With flaps 2 selected, leading edge slats 2&3,
and 6&7 are deployed. The remaining slats, as well as *all* krueger
flaps, are retracted.

Happy Flying!
Scott Skylane