OHLHD
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What`s That Thing On A B737-300 (winglets)

Thu Mar 20, 2008 10:21 pm

Hi, I just flew SN's B737-300 ( with Winglets) and I noticed that little thing below the wing for the first time on a B737. Can anyone please tell me what it is.

Many thanks!

What'that thing?
 
artsyman
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RE: What`s That Thing On A B737-300 (winglets)

Thu Mar 20, 2008 10:24 pm

They are headlights. They go up and down as needed
 
avioniker
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RE: What`s That Thing On A B737-300 (winglets)

Thu Mar 20, 2008 10:27 pm

That would be the retractable landing light.
They were relocated to the fuselage on the NG aircraft.
 

Geez Artsyman, you're quick for an ops type. . .  Silly

[Edited 2008-03-20 15:29:10]
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HAWK21M
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RE: What`s That Thing On A B737-300 (winglets)

Fri Mar 21, 2008 7:54 am

The Classic series [B737-100to500] had the Outboard landing lights located on the Outboard TE Flap fairings.The two Microswitches keep the Beam of light aligned to the Longitunational axis of the Aircraft irrespective of flap position.The Landing light is moved by an electric motor driving a Square threaded jackscrew.
These lights had three position...Off/Extend/On.

These were removed on the NGs and fitted ahead of the Pack doors.

regds
MEL
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OHLHD
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RE: What`s That Thing On A B737-300 (winglets)

Fri Mar 21, 2008 8:52 am

Thanks for the answer, it was very helpful!  Smile
 
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Starlionblue
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RE: What`s That Thing On A B737-300 (winglets)

Fri Mar 21, 2008 10:11 am

DC-9s (and MD-8x??) also have retractable lights at the wingtips. According to a pilot I spoke to you could feel a faint vibration when they were out. Don't know if he was pulling my leg.
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nema
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RE: What`s That Thing On A B737-300 (winglets)

Fri Mar 21, 2008 11:12 am



Quoting Starlionblue (Reply 5):
According to a pilot I spoke to you could feel a faint vibration when they were out. Don't know if he was pulling my leg.

They dont really look very aerodynamic do they...i always thought they were front of the landing gear.
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IAHFLYR
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RE: What`s That Thing On A B737-300 (winglets)

Fri Mar 21, 2008 12:49 pm



Quoting NEMA (Reply 6):
They dont really look very aerodynamic do they

They also act as speed brakes since the 737''s speed brakes are such an effective item already!  biggrin   crazy 
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AAR90
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RE: What`s That Thing On A B737-300 (winglets)

Fri Mar 21, 2008 3:00 pm



Quoting Starlionblue (Reply 5):
Don't know if he was pulling my leg.

No he was not. The vibrations are slight and most pax would probably not notice though.
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avioniker
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RE: What`s That Thing On A B737-300 (winglets)

Fri Mar 21, 2008 4:13 pm

Quoting Starlionblue (Reply 5):
According to a pilot I spoke to you could feel a faint vibration when they were out. Don't know if he was pulling my leg.

He wasn't pulling your leg. They provide enough drag that Douglas installed a system, should you lose an engine, that automatically retracts the lights.
 

[Edited 2008-03-21 09:14:07]
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
 
OHLHD
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RE: What`s That Thing On A B737-300 (winglets)

Fri Mar 21, 2008 9:48 pm

Another question: Is it standard or was it optional as I travelled 2 days later a SK 735 and I could not find it.
 
avioniker
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RE: What`s That Thing On A B737-300 (winglets)

Fri Mar 21, 2008 10:38 pm

http://www.b737.org.uk/aircraft_general.htm#Lights

http://www.b737.org.uk/flap_farings.jpg

They're there, Probably just not extended by the crew for whatever reason, unless you were actually on a 600. . .
 Smile
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HAWK21M
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RE: What`s That Thing On A B737-300 (winglets)

Sat Mar 22, 2008 8:45 am



Quoting OHLHD (Reply 10):
Another question: Is it standard or was it optional as I travelled 2 days later a SK 735 and I could not find it.

Probably retracted.

If the Landing lights gets stuck in the Extended position there is a CDL release item but with some penalty,because of the drag induced.

regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
OHLHD
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RE: What`s That Thing On A B737-300 (winglets)

Sun Mar 23, 2008 5:58 pm



Quoting Avioniker (Reply 11):

I travelled a DY B733 from OSL to TRD and a SK B735 TRD-BOO-TOS and on both flights I did not see them.

Quoting HAWK21M (Reply 12):

Many thanks for the ansmwers.  Smile

If interested here is the trip report.
Back To The North SN,DY And SK Pics/Vids (by OHLHD Mar 21 2008 in Trip Reports)
 
panserbjorne
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RE: What`s That Thing On A B737-300 (winglets)

Fri Mar 28, 2008 2:34 pm



Quoting HAWK21M (Reply 12):
If the Landing lights gets stuck in the Extended position there is a CDL release item but with some penalty,because of the drag induced.

Correction,it is as per MEL,not CDL,we use CDL to despatch aircraft with missing items,whereas MEL is to despatch with unserviceable item. And the fuel penalty for flying with landing light stucked in extended position is 1%.
 
2H4
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RE: What`s That Thing On A B737-300 (winglets)

Fri Mar 28, 2008 2:55 pm



Quoting Panserbjorne (Reply 14):
And the fuel penalty for flying with landing light stucked in extended position is 1%.

Is that 1% indicative of the actual increase in fuel burn, or is it more of a broad figure that makes up for the increase and then some?

Also, can a 737 with a stuck landing light be operated in known icing conditions? I would imagine there's a potential for quite the ice chunk to build up.

2H4
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tdscanuck
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RE: What`s That Thing On A B737-300 (winglets)

Sat Mar 29, 2008 2:37 am



Quoting 2H4 (Reply 15):
Also, can a 737 with a stuck landing light be operated in known icing conditions? I would imagine there's a potential for quite the ice chunk to build up.

As far as I know, yes. Even if you did get a big chunk of ice on the landing light, it's not going to harm anything when it comes loose because there's nothing to hit. It's behind the engine and below the tail.

Tom.
 
Mir
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RE: What`s That Thing On A B737-300 (winglets)

Sat Mar 29, 2008 3:01 am



Quoting Tdscanuck (Reply 16):
As far as I know, yes. Even if you did get a big chunk of ice on the landing light, it's not going to harm anything when it comes loose because there's nothing to hit. It's behind the engine and below the tail.

Plus, I would think that turning the light on would generate enough heat to melt it off.

-Mir
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panserbjorne
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RE: What`s That Thing On A B737-300 (winglets)

Sat Mar 29, 2008 9:07 am



Quoting 2H4 (Reply 15):
s that 1% indicative of the actual increase in fuel burn, or is it more of a broad figure that makes up for the increase and then some?

Also, can a 737 with a stuck landing light be operated in known icing conditions? I would imagine there's a potential for quite the ice chunk to build up.

No the 1% is not the actual increase,it's somehow rather calculated by Boeing,1% for each extended light.
And about the icing condition,there is no other operational limitation other than this 1% of fuel burn,don't ask me how I know,Boeing says this,that flying a B737 with an extended landing lights to a known icing condition is allowed. And trust me,I have deferred this defect so many times,as per the MEL..  Wink
 
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HAWK21M
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RE: What`s That Thing On A B737-300 (winglets)

Sat Mar 29, 2008 9:40 am



Quoting Panserbjorne (Reply 14):
Correction,it is as per MEL,not CDL,we use CDL to despatch aircraft with missing items,whereas MEL is to despatch with unserviceable item. And the fuel penalty for flying with landing light stucked in extended position is 1%.

The CDL also indicates the Penalty faced.

regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
AirframeAS
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RE: What`s That Thing On A B737-300 (winglets)

Sat Mar 29, 2008 10:49 pm



Quoting Mir (Reply 17):
Plus, I would think that turning the light on would generate enough heat to melt it off.

You are correct. Those lamps are pretty hot. You can get a nasty burn if you touch them on the ground.
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