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Landing Lights On B737 Flashing  
User currently offlineMdobeck From United States of America, joined Jun 2002, 1 posts, RR: 0
Posted (12 years 1 month 2 weeks 4 days 3 hours ago) and read 6214 times:

I have noticed that on sometimes the landing lights on B737 flash back and forth. Does anyone know why? I have not noticed this on any other aircraft.

Thanks.

29 replies: All unread, showing first 25:
 
User currently offline777236ER From , joined Dec 1969, posts, RR:
Reply 1, posted (12 years 1 month 2 weeks 4 days 3 hours ago) and read 6192 times:

Yup on newer 737s it's an option (and is on some older ones too. Westjet's 732s??) and it a company preference. Makes the a/c more conspicuous apparently. *shrugs* Upto you.

User currently offline744rules From Belgium, joined Mar 2002, 407 posts, RR: 0
Reply 2, posted (12 years 1 month 2 weeks 4 days 3 hours ago) and read 6189 times:

I think this is just an illusion. On a 737 you have landinglights that are lowered from the wing when in use. So I can imagine you get the idea of flashing lights as the wings are going up and down due to turbulence

User currently offlineFallingeese From Canada, joined Apr 2001, 2097 posts, RR: 18
Reply 3, posted (12 years 1 month 2 weeks 4 days 2 hours ago) and read 6158 times:

744rules, no the lights actually do alternate.


Mark McWhirter...Contrails Photography
User currently offlineSccutler From United States of America, joined Jan 2000, 5499 posts, RR: 28
Reply 4, posted (12 years 1 month 2 weeks 4 days 1 hour ago) and read 6175 times:

WN is refitting all of its fleet of 73s with the alternating landing lights; they both improve visibility, and extend bulb life.

Such a deal!



...three miles from BRONS, clear for the ILS one five approach...
User currently offlineDuncan From United States of America, joined Apr 2002, 131 posts, RR: 0
Reply 5, posted (12 years 1 month 2 weeks 4 days ago) and read 6144 times:

The landing lights you are talking about extend from the flap track fairings upon flap deployment.

Duncan


User currently offlineJetguy From , joined Dec 1969, posts, RR:
Reply 6, posted (12 years 1 month 2 weeks 3 days 23 hours ago) and read 6136 times:

What you saw was an airplane with "Pulse Lights" installed. It's a very common option on bizjets that pulses or flashes the landing and recognition lights to enhance visibility and to also save on bulb replacement costs. A number of aircarriers are starting to install the systems on their aircraft also. I'm guessing that the 737 you was either Southwest or America West. Right?

User currently offlineTT737FO From United States of America, joined Jun 2001, 472 posts, RR: 9
Reply 7, posted (12 years 1 month 2 weeks 3 days 22 hours ago) and read 6115 times:

This topic appears over and over and over again.

User currently offlineJetdoctor From United Kingdom, joined Aug 2001, 257 posts, RR: 0
Reply 8, posted (12 years 1 month 2 weeks 3 days 20 hours ago) and read 6108 times:

I would think a flashing light would decrease hours, as "cycles" kill a bulb quicker.

RT



Break ground, and head into the wind. Don't break wind and head into the ground.
User currently offlineJetguy From , joined Dec 1969, posts, RR:
Reply 9, posted (12 years 1 month 2 weeks 3 days 20 hours ago) and read 6108 times:

Jetdoc...
The pulsing isn't on and off, rather the lights are dimmed continuously in a range from about 30% to 100%. (The system is simply an automatic rheostat for the landing light circuit.) The net effect is that the average filament temperature of the bulb is lowered by about 40% and the bulb life is increased significantly. (We used to go through landing lights by the case, now maybe one or two bulbs per year per airplane.) As they say, "Works good, saves a lot of money, lasts a long time."
Jetguy


User currently offlinePPGMD From United States of America, joined Sep 2001, 2453 posts, RR: 0
Reply 10, posted (12 years 1 month 2 weeks 3 days 19 hours ago) and read 6092 times:

Also I guess a side effect is I hear that there are studies that found that pulsing lights have an effect on birds during the day. Just a rumor, but one of you guys might have heard something like that.


At worst, you screw up and die.
User currently offlineJetguy From , joined Dec 1969, posts, RR:
Reply 11, posted (12 years 1 month 2 weeks 3 days 18 hours ago) and read 6101 times:

I haven't heard that one. Actually, I kind of doubt it based on the number of bird strikes that we've had recently. We operate the pulse lights continously below FL180. On second thought, maybe there is an effect - the old "deer in the headlights" thing.  Innocent

Actually, we live on a migratory bird flyway and we typically get a few "Shreaded Tweets".

Jetguy


User currently offlineShaun3000 From United States of America, joined Mar 2002, 445 posts, RR: 0
Reply 12, posted (12 years 1 month 2 weeks 3 days 16 hours ago) and read 6063 times:

I've seen them on most Southwest 737s flying over my house (I live in Dallas) for years. I was surprised, though, to see them on most of the business jets coming into Addison when I started my flight training.

User currently offline744rules From Belgium, joined Mar 2002, 407 posts, RR: 0
Reply 13, posted (12 years 1 month 2 weeks 3 days 16 hours ago) and read 6062 times:

Is this standard on all 737, as I never noticed it so far (I am there for working, not for spotting) . What lights are flashing ?? Are it the ones lowered from the wing, or also the ones on the leading edge .

User currently offlineAvioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11
Reply 14, posted (12 years 1 month 2 weeks 3 days 8 hours ago) and read 6027 times:

The pulsing lights are optional but more companies are going to them as they do significantly increase the visibility of the aircraft to others and to the controllers trying to see them on approach.
The attenuation system which reduces the power to cause the pulse has been shown to increase the life of the bulb but the cutoff pulse system doesn't and some think it shortens the life.
The single best way to increase the life of the lamp is to clean the oxide or plastic coating off the terminals before you install the bulb. A little scotchbrite on the lugs and bulb terminals can double the life of the lamp.



One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
User currently offlineDragogoalie From Australia, joined Oct 2001, 1220 posts, RR: 6
Reply 15, posted (12 years 1 month 2 weeks 3 days 6 hours ago) and read 6012 times:

I think you're all wrong...they're just doing it to get other pilots to turn off their high beams  Wink/being sarcastic. Anyone got a video of this or something? I'd like to see it.

--dragogoalie-#88--



Formerly known as Jap. Srsly. AUSTRALIA: 2 days!
User currently offlineB747skipper From , joined Dec 1969, posts, RR:
Reply 16, posted (12 years 1 month 2 weeks 1 day 5 hours ago) and read 5941 times:

Gentlemen -
Yes, there is a new option available on aircraft to get alternating landing lights or flashing lights, and it now becomes available for all other planes, not only for 737, although the 737 was the "prototype" of that new feature...
A note here to "some of you"...
The sentence "this does not exists"... blantantly advertises ignorance...
xxx
I am the 747 flight manager with my airline, and since 6 months I have received tons of documents and offers on my desk from various vendors to fit our airplanes with this new option. It is shown that the life of the landing lights will be increased somewhat - Jetguy properly explains that fact...
xxx
Each airlines (or countries) have various standards and procedures as to when they select "landing lights ON" for collison avoidance, in the USA you do it below 18,000 feet as an example, for various valid reasons... since it is the transition altitude and transition level among others...
In many other areas of the world, landing lights are ON below 10,000 feet or within 30 NM of the airport at which you land, whichever happens first, since we consider that below 10,000 feet, is the airspace used by VFR traffic...
Happy landings to all of you...
(s) Skipper


User currently offlineDragogoalie From Australia, joined Oct 2001, 1220 posts, RR: 6
Reply 17, posted (12 years 1 month 2 weeks 1 day 5 hours ago) and read 5924 times:

I still think I'm right...what does a 747 pilot know that a c152 pilot doesn't, right? just kidding of course. This is one thing that I love about this board. You can ask questions, and while you do get a lot of people who claim to know the answers..and wise asses like me who make some lame joke about it. In most cases, eventually someone who knows thier stuff will come along and tell us what we asked, and most of the time more than that. Thanks to all you vets out there and keep it coming. Hopefully when I'm in your position, I'll be able to do the same. Till then i gotta keep learning from you.

--dragogoalie-#88--



Formerly known as Jap. Srsly. AUSTRALIA: 2 days!
User currently offlineAndroid From Japan, joined Jun 2002, 80 posts, RR: 0
Reply 18, posted (12 years 1 month 2 weeks 23 hours ago) and read 5896 times:

The company Pulse lite that markets this sytem has an interesting video from the US gov't that actually shows the flashing lights scare birds away .

User currently offlineB747skipper From , joined Dec 1969, posts, RR:
Reply 19, posted (12 years 1 month 2 weeks 22 hours ago) and read 5901 times:

Gentlemen -
Yes indeed, pulsating lights or... operating the aircraft weather radar are supposed to scare birds away... many individuals know that... but...
A fact is that birds know more about flying that we do as humans, who dare to fly airplanes and claim safety... as an example, due to their knowledge about physics and aerodynamics, birds almost always takeoff upwind...
So the airplane goes on the runway for line-up and hold... lights/radar on...
Slight crosswind, birds on the side of the runway having lunch...
Crosswind from the left... birds are on the right hand side...
They get scared by lights and weather radar of the aircraft...
They takeoff upwind... (they can see the windsock, dont they???)...
We roll down the runway and birdies (scared) call V1, VR and V2 as well...
Problem is - their control tower and ours is different...
This above the runway, feathers against fan blades of a roaring jet engine...
Feathers in the pressurization bleed lines, fried chicken through tailpipe...
There are 2 theories, scare the birds, or do not scare them...
Who knows the answer, I dont... please educate me...
Personally, I prefer to scare C-150s away rather than seagulls...
Happy landings to all...
(s) Skipper


User currently offlineDragogoalie From Australia, joined Oct 2001, 1220 posts, RR: 6
Reply 20, posted (12 years 1 month 1 week 6 days 5 hours ago) and read 5800 times:

Personally, I prefer to scare C-150s away rather than seagulls...

trust me, you don't need flashing lights to do that. If the pilot has half a brain (which not all of them do) and sees something that size coming at them, they'll probably move  Wink/being sarcastic

--dragogoalie-#88--



Formerly known as Jap. Srsly. AUSTRALIA: 2 days!
User currently offlineBR715-A1-30 From , joined Dec 1969, posts, RR:
Reply 21, posted (12 years 1 month 1 week 2 days 7 hours ago) and read 5733 times:

Southwest has these on all 737-2H4/3H4, and 5H4. But those are the only ones. The Ex-AIR CAL ones do not have them. The 737-7H4 does not have them as far as I know, but I could be wrong. The -H4 series aircraft for 2/3/5 have them

User currently offlineWilax From United States of America, joined Jun 2002, 465 posts, RR: 3
Reply 22, posted (12 years 1 month 1 week 2 days 4 hours ago) and read 5717 times:

Question, why is it that no major aircraft use HID or xenon lights for landing or taxiing. In cars they are the standard in the high end market. There is no filament only an arc that creates light and it is many times more intense than incandescent bulbs, and they last for the life of the car. I just knew that they would pop up on planes but not yet...

User currently offline737doctor From United States of America, joined Mar 2001, 1332 posts, RR: 39
Reply 23, posted (12 years 1 month 1 week 2 days 3 hours ago) and read 5716 times:

The system is called ALLS - Advanced Landing Light System. Some of our aircraft have had this feature disabled due to excessive radio interference.


Patrick Bateman is my hero.
User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 24, posted (12 years 1 month 1 week 2 days 3 hours ago) and read 5707 times:

>>>The system is called ALLS - Advanced Landing Light System...

Believe that's "Alternating", not "Advanced"....


25 737doctor : Believe that's "Alternating", not "Advanced".... Nope, sorry. Not according to my training documents.
26 OPNLguy : Email me if ya can...
27 ArcticTern : Hi, Just a query, flashing of landing lights is it different from switchin on and off the landing lights. The repeated switching off and switchin on l
28 JRadier : switching it on/off makes them go on/off on boths sides simultaniously, the 'flashing'has them alternating, so left-right-left-right etc.
29 HAWK21M : Its only the Intensity thats being varied.It seems like flashing though. regds MEL
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