OHLHD From Finland, joined Dec 2004, 3962 posts, RR: 27 Posted (5 years 3 months 1 day 14 hours ago) and read 3451 times:
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.
Avioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11 Reply 2, posted (5 years 3 months 1 day 14 hours ago) and read 3445 times:
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. . .
[Edited 2008-03-20 15:29:10]
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
HAWK21M From India, joined Jan 2001, 31228 posts, RR: 58 Reply 3, posted (5 years 3 months 1 day 5 hours ago) and read 3321 times:
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.
Starlionblue From Hong Kong, joined Feb 2004, 15904 posts, RR: 66 Reply 5, posted (5 years 3 months 1 day 3 hours ago) and read 3284 times:
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.
"There are no stupid questions, but there are a lot of inquisitive idiots." - from Citadel by John Ringo
NEMA From United Kingdom, joined Feb 2006, 682 posts, RR: 0 Reply 6, posted (5 years 3 months 1 day 2 hours ago) and read 3265 times:
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.
There isnt really a dark side to the moon, as a matter of fact its all dark!
Avioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11 Reply 9, posted (5 years 3 months 21 hours ago) and read 3155 times:
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
Panserbjorne From Malaysia, joined Mar 2008, 7 posts, RR: 0 Reply 14, posted (5 years 2 months 3 weeks 2 days 22 hours ago) and read 2574 times:
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 From United States of America, joined Oct 2004, 8950 posts, RR: 62 Reply 15, posted (5 years 2 months 3 weeks 2 days 22 hours ago) and read 2561 times:
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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.
Tdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80 Reply 16, posted (5 years 2 months 3 weeks 2 days 10 hours ago) and read 2456 times:
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.
Mir From United States of America, joined Jan 2004, 19813 posts, RR: 56 Reply 17, posted (5 years 2 months 3 weeks 2 days 10 hours ago) and read 2452 times:
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
7 billion, one nation, imagination...it's a beautiful day
Panserbjorne From Malaysia, joined Mar 2008, 7 posts, RR: 0 Reply 18, posted (5 years 2 months 3 weeks 2 days 4 hours ago) and read 2415 times:
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..
HAWK21M From India, joined Jan 2001, 31228 posts, RR: 58 Reply 19, posted (5 years 2 months 3 weeks 2 days 3 hours ago) and read 2409 times:
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%.
AirframeAS From United States of America, joined Feb 2004, 14150 posts, RR: 26 Reply 20, posted (5 years 2 months 3 weeks 1 day 14 hours ago) and read 2341 times:
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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