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Flaps 30 or Flaps 40?

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Till View Drop Down
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    Posted: Dec-21-2010 at 10:53am
When flying the 737NG, what determines if I should land with the Flaps 30, or the Flaps 40 setting ?  In other words, what factors should be considered when choosing the proper flap setting on approach and landing?
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Jens0953 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jens0953 Quote  Post ReplyReply Direct Link To This Post Posted: Dec-21-2010 at 11:02am
Hi Till, my first thought would be: Runway length available.
You get faster on the ground and passengers quicker to the destination.
Happy landings from
J.P.Frost

Win 7 64/ASUS P5N-D/Intel Q9650/4GB RAM/GTX 480 1,5 GB/Dual Monitor 22"
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brianmeyers View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote brianmeyers Quote  Post ReplyReply Direct Link To This Post Posted: Dec-21-2010 at 11:10am
ILS Landing = Flaps 40
Short Runway landing = Flaps 40
Normal Runway landing = Flaps 30
Non-ILS landing = Flaps 30

If you are landing on a short runway doing Non-ILS than do flaps 40.

If you are doing a normal runway with ILS do flaps 40.
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billywhu View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote billywhu Quote  Post ReplyReply Direct Link To This Post Posted: Dec-21-2010 at 11:27am
Originally posted by brianmeyers brianmeyers wrote:

ILS Landing = Flaps 40
Short Runway landing = Flaps 40
Normal Runway landing = Flaps 30
Non-ILS landing = Flaps 30

If you are landing on a short runway doing Non-ILS than do flaps 40.

If you are doing a normal runway with ILS do flaps 40.

Not quite. Most NG operators use flap 30 when ever they can (including ILS approaches) and some use flap 40 for autolands
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pilotczj View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pilotczj Quote  Post ReplyReply Direct Link To This Post Posted: Dec-21-2010 at 11:28am
Usually Flaps 40 for LVP and short runways :)
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FLIGHTSIMFANATIC View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FLIGHTSIMFANATIC Quote  Post ReplyReply Direct Link To This Post Posted: Dec-21-2010 at 12:40pm
woulden't that also depend on weight and winds as well?
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klk232 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote klk232 Quote  Post ReplyReply Direct Link To This Post Posted: Dec-21-2010 at 12:50pm
and company SOP's
i73930K GTX580 x 1.5gig 12gb ram
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atcox View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote atcox Quote  Post ReplyReply Direct Link To This Post Posted: Dec-21-2010 at 2:11pm

Flaps 30:

- higher speed,
- less approach thrust
- less fuel burn
- less noise

Flaps 40:
- better view for low visibility approaches
- slower speed
- shorter landing distance
- lower brakes temperature after landing
- more noise during approach
- higher fuel burn
- higher approach thrust

So, you (or your SOP) decide...

Cheers,
Dominic

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brianmeyers View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote brianmeyers Quote  Post ReplyReply Direct Link To This Post Posted: Dec-21-2010 at 2:17pm
what do you mean better View?
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atcox View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote atcox Quote  Post ReplyReply Direct Link To This Post Posted: Dec-21-2010 at 2:19pm
Lower pitch level.
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brianmeyers View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote brianmeyers Quote  Post ReplyReply Direct Link To This Post Posted: Dec-21-2010 at 2:23pm
I land flaps 30 with the nose on the horizon all the time =/

actually, i learned partly how to land like that thanks to this video :D


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atcox View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote atcox Quote  Post ReplyReply Direct Link To This Post Posted: Dec-21-2010 at 2:43pm

Don't judge what is true too qucikly. 

Flaps 40 provides lower nose pitch which is official statement that can be found in FCTM for 737NG. This is the reason why some operators (like Ryanair) always use flaps 40 for autolands while 30 for most of another landings.

Recommended reading (apart from FCTM)

http://www.pprune.org/tech-log/157082-cat3a-b737-flaps-30-40-a.html

Cheers
Dominic

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brianmeyers View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote brianmeyers Quote  Post ReplyReply Direct Link To This Post Posted: Dec-21-2010 at 2:47pm
lol. i forgot you said "for low vis approaches" when you said that. XD

sorry i missed that :P

Yeah i have noticed more view when landing in flaps 40.  like the above posted.  I just read his post the wrong way.
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Till View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Till Quote  Post ReplyReply Direct Link To This Post Posted: Dec-21-2010 at 3:28pm
Thanks for all the info. As usual, very helpful people on this forum! After reading the posting from the link that atcox provided, it seems that there is a bit of controversy among pilots about it.
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Omaniac View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Omaniac Quote  Post ReplyReply Direct Link To This Post Posted: Dec-23-2010 at 10:47am

No controversy. The aircraft is certified for FL 30 and FL 40 normal landings, manual or automatic. FL 30 is the usual landing flap due less drag, noise and fuel burn.

Short runways use FL 40 due shorter landing distance.

Low visibility autoland use FL 40. It lowers the nose and will give you a better view towards the approach/runway lights.


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Till View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Till Quote  Post ReplyReply Direct Link To This Post Posted: Dec-23-2010 at 10:58am
Pretty clear explanation, thanks Omaniac
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flyinpilot212121 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyinpilot212121 Quote  Post ReplyReply Direct Link To This Post Posted: Dec-23-2010 at 1:14pm
Judgung by the video that the probe heat goes off right after lnading, Is  this correct???
EDIT: Obviously its correct, but did anyone know that??   I didnt!!
Hooorrraaayyyyy for IFLY,Flight1 and FS2crew

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atcox View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote atcox Quote  Post ReplyReply Direct Link To This Post Posted: Dec-23-2010 at 1:26pm
It's a part of standard procedure after landing.
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flyinpilot212121 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyinpilot212121 Quote  Post ReplyReply Direct Link To This Post Posted: Dec-23-2010 at 1:30pm
Originally posted by atcox atcox wrote:

It's a part of standard procedure after landing.
I must have missed that in my reading, Maybe Im due for another ground school course on the 737LOL
Hooorrraaayyyyy for IFLY,Flight1 and FS2crew

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Mark Richards View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark Richards Quote  Post ReplyReply Direct Link To This Post Posted: Dec-23-2010 at 4:18pm
Originally posted by flyinpilot212121 flyinpilot212121 wrote:

Judgung by the video that the probe heat goes off right after lnading, Is  this correct???

It goes after landing to begin the cooling process so that the ground crew don't get injured while turning the aircraft around.
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flyinpilot212121 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyinpilot212121 Quote  Post ReplyReply Direct Link To This Post Posted: Dec-23-2010 at 4:28pm
Originally posted by Mark Richards Mark Richards wrote:

Originally posted by flyinpilot212121 flyinpilot212121 wrote:

Judgung by the video that the probe heat goes off right after lnading, Is  this correct???

It goes after landing to begin the cooling process so that the ground crew don't get injured while turning the aircraft around.
aaaaahhhhhhhhhhhh   that makes a lot of sense, thanks for the reason behind it.
Hooorrraaayyyyy for IFLY,Flight1 and FS2crew

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brianmeyers View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote brianmeyers Quote  Post ReplyReply Direct Link To This Post Posted: Dec-23-2010 at 4:34pm
exactly. My father burned his arm on the nose gear light.  Also, sometimes pilots fail to turn the nose gear light off before pulling into the terminal area and its is so bright it can blind you.
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