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737- Can You Expain "mini" Flap?  
User currently offlineZionstrat From United States of America, joined Apr 2001, 226 posts, RR: 0
Posted (12 years 11 months 3 weeks 1 day 6 hours ago) and read 2497 times:

I'm sure this will be an easy one for anyone with familiar with 737 technology, however I noticed a 'mini' flap for lack of better words on a recent flight and would like to understand it's purpose and operation-

If you look at the "main" outboard flap, there is a smaller extension on the trailing edge that seems to extend before the main flap extends. At take off, it appears that it is primarily this 'mini' flap that is extended, while the "main" flap also extends at higher settings-

Here's a picture in case I'm not explaining well- It is the final "segment" of this flap that is extended in this picture.


Click for large version
Click here for full size photo!

Photo © Martin Bauer



I'm interested in the name, and the purpose- Why not a single flap that simply extends farther down? It doesn't appear to act as a split flap.

Thanks in advance!


17 replies: All unread, jump to last
 
User currently offlineA/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 4
Reply 1, posted (12 years 11 months 3 weeks 1 day 4 hours ago) and read 2373 times:

This I believe is just a triple slotted flap, this increases camber and adds lift for takeoff and also acts to slow the a/c down on approach, clever bit of kit!!
regards
a/c


User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 2, posted (12 years 11 months 3 weeks 1 day 3 hours ago) and read 2367 times:

A/C nailed it, just Boeings choice of design versus the "barn door" type that are found on DC-9s/MD-80s etc. The three sections are known as the fore flap, the mid flap, and the the aft flap.

FYI, Only the -100 thru -500 have triple-slotted trailing edge flaps like these, and all the NG variants (-600 thru -900) have a double-slotted design that was an improvement over the old.


User currently offlineDavid B. From United States of America, joined Jun 2001, 3148 posts, RR: 5
Reply 3, posted (12 years 11 months 3 weeks 1 day 3 hours ago) and read 2357 times:

What is that little thing at the end with what looks like a little hole in it?
Its pointing towards the plane.



Teenage-know-it-alls should be shot on sight
User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 4, posted (12 years 11 months 3 weeks 1 day 3 hours ago) and read 2348 times:

Hi David B.

I believe what you're asking about is the exit port for the fuel jettison valve.

If the pilots have to dump fuel for an emergency landing, etc, this is where it flys out! I should be able to find a photo.

Chris  Smile




"Just a minute while I re-invent myself"
User currently offline310_engineer From Belgium, joined Dec 2000, 165 posts, RR: 0
Reply 5, posted (12 years 11 months 3 weeks 1 day 3 hours ago) and read 2340 times:

Hi Chris
It's the logolight!
Never heard about a 737 with fuel jettison.

Cheers
Mike


User currently offlineSabenapilot From Belgium, joined Feb 2000, 2714 posts, RR: 46
Reply 6, posted (12 years 11 months 3 weeks 1 day 2 hours ago) and read 2344 times:

Mr Spaceman,
From an ex-B737 pilot, the B737 can not dump fuel!!!

David B.,
The little thing at the end of the wing pointing towards the plane is nothing more then the logo light.
It points at the tail and is switched on during night to make some publicity...



User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 7, posted (12 years 11 months 3 weeks 1 day 2 hours ago) and read 2337 times:

>>>If the pilots have to dump fuel for an emergency landing, etc, this is where it flys out! I should be able to find a photo.

I wish you luck, since the 737 doesn't have a fuel dump system...  Big grin

The item that Davod B is curious about is called a "logo" light, and it is indeed pointed towards the aircraft. In fact, it's specifically aimed to illuminate the entire vertical stabilizer of the aircraft, so better night ID of aircraft, as well as showing the airline's logo for promotional purposes. There's also one on the opposite wingtip. Some larger aircraft (the 747 is one that comes to mind) have theirs imbedded on the top side of the horizontal stabilizers on each side, shining up from there.

Not all aircraft have logo lights, and on Boeing's at least, they are an option....


User currently offlineSabenapilot From Belgium, joined Feb 2000, 2714 posts, RR: 46
Reply 8, posted (12 years 11 months 3 weeks 1 day 2 hours ago) and read 2326 times:

Seems we all replied at the same moment guys, resulting in 3 posts saying more or less the same....



User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 9, posted (12 years 11 months 3 weeks 1 day 2 hours ago) and read 2317 times:

Hey, great minds work alike...  Smile

(Don't ya just love this global village stuff?)


User currently offlineSabenapilot From Belgium, joined Feb 2000, 2714 posts, RR: 46
Reply 10, posted (12 years 11 months 3 weeks 1 day 1 hour ago) and read 2314 times:

Global village?
I'd say open university!
Over the last few months I have replied to numerous technical questions related to the B737. In most (but not all) cases they came from HAWK21. It seems to me some guys are doing their type rating course on this forum.... or at least they let others answer their test questions.  Wink/being sarcastic
Anyway, I'm glad I could help you all out guys...
Keep the questions comming!


User currently offline310_engineer From Belgium, joined Dec 2000, 165 posts, RR: 0
Reply 11, posted (12 years 11 months 3 weeks 1 day 1 hour ago) and read 2305 times:

I think he will never make that mistake twice.

Sabenapilot:
What do you think what happens with us (SN) tomorrow?

Cheers
Mike


User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 12, posted (12 years 11 months 3 weeks 1 day 1 hour ago) and read 2308 times:

Hi guys,

Well, now that I've pulled my head out of my ass, I can say to David B. --- I'm sorry about that!

I'm sure glad I stated that I "Believed" it was for dumping fuel, instead of "I'm sure it's for dumping fuel". It's been made very clear to me that I believed WRONG! Thanks guys for straightening that out.

That logo light (in the photo) sure looks like a hole in the wingtip fairing (where fuel would be dumped) and not a light, because it's so dark.

Also, thanks for wishing me luck in finding pics of a 737 dumping fuel, but as I'm sure you know, I didn't find any. In fact, I couldn't find any photos of any type of airliner jettisoning fuel. I've seen many photo's of this on Airliners.net. I wonder what the keywords are?

Not to go way off topic about the 737's flaps, but, can someone tell me why a 737 doesn't have the ability to dump fuel? Could it be that the jet's Maximum Gross T/O and Landing weight's are almost identical?

Chris  Smile/happy/getting dizzy




"Just a minute while I re-invent myself"
User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 13, posted (12 years 11 months 3 weeks 1 day 1 hour ago) and read 2304 times:

A couple of pix, plus a link to my answer on a previous message thread from April...


Click for large version
Click here for full size photo!

Photo © Peter D. Baumgartner



Click for large version
Click here for full size photo!

Photo © Richard Zeman


http://www.airliners.net/discussions/general_aviation/read.main/446390/6/



User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 27
Reply 14, posted (12 years 11 months 3 weeks 1 day ago) and read 2297 times:

UR correct (Max TO weight and Landing weights are very close to one another - therefore no need for fuel jettison).

User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 15, posted (12 years 11 months 3 weeks 9 hours ago) and read 2267 times:

Logo light all right.
 Smile

80% of my questions are on the B737.But I'm from maintenance.Just want to clear any doubt I could think of on this aircraft.

Experience is what this forum has Which no book can replace. Smile
regds
HAWK.



Think of the brighter side!
User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 16, posted (12 years 11 months 2 weeks 5 days 2 hours ago) and read 2206 times:

Hi guys.

Thanks for letting me know that the nearly identical Maximum Gross T/O and Landing weights of the 737 is the reason why it doesn't have a fuel dumping system. The Boeing 777 sure isn't in the same boat. According to an article I'm reading, it can takeoff at Maximum Gross Weight and fly for 11 hrs before it reaches it's certified Maximum Landing Weight of 460,000 pounds. The 777 definetly needs the ability to dump fuel.

Question: In the photo of the Fokker F-28 below, is the red circle on the aft edge of the farthest wing fairing, a Logo Light?

Click for large version
Click here for full size photo!

Photo © Chris Coduto


Chris  Smile






"Just a minute while I re-invent myself"
User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 17, posted (12 years 11 months 2 weeks 4 days 19 hours ago) and read 2195 times:

Yes, it's a logo light on that Fokker.

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