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737s And MD80s Have 2 Pairs Of Landing Lights,why?  
User currently offlineWilliam From United States of America, joined Jun 1999, 1268 posts, RR: 0
Posted (11 years 4 months 1 week 5 days 19 hours ago) and read 3405 times:

Why is it on a MD80 or 737 there two pairs of landing lights,one inboard and the other outboard on the wing (MD80s further out near the wingtip)?

Widebodies do not have 2 pairs of landing lights,777s and the like have their landing lights inboard of the wing.

12 replies: All unread, jump to last
 
User currently offlineB747skipper From , joined Dec 1969, posts, RR:
Reply 1, posted (11 years 4 months 1 week 5 days 19 hours ago) and read 3370 times:

In the 747 - we have 2 pairs of regular landing lights, one pair of "turnoff" lights... had the same in the 707s...
xxx
(s) Skipper


User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 27
Reply 2, posted (11 years 4 months 1 week 5 days 17 hours ago) and read 3282 times:

The B767 and B777 have 2 pairs of landing lights.
The have the landing lights located at the wing roots and landing lights on the nose gear as well.


User currently offlineWilax From United States of America, joined Jun 2002, 465 posts, RR: 3
Reply 3, posted (11 years 4 months 1 week 5 days 16 hours ago) and read 3285 times:

md80's actually do not have two sets of landing lights. They have taxi lights on the nosegear, like most aircraft and landing lights on the wingtips, none inboard. 737 classics have "armpit" lights and another set under the wings on the outermost flap guides whereas NG737's have "armpit" lights and a set under the belly between the wings; all in addition to the nosegear taxi lights.

User currently offlineWilliam From United States of America, joined Jun 1999, 1268 posts, RR: 0
Reply 4, posted (11 years 4 months 1 week 4 days 19 hours ago) and read 3105 times:

According to the MD80 schematic,you are correct. The inboard light is a taxying light,yet it is turned on at the same time as the landing light. Thus giving the appearance of two outboard and two inboard lights.

As regards to the armpit lights on the 737,aren't they also landing lights? A 737 according to schematics do have landing/taxying light inboard of the wing.

Why do not other Boeings have "armpit" lights.


User currently offlineWilax From United States of America, joined Jun 2002, 465 posts, RR: 3
Reply 5, posted (11 years 4 months 1 week 4 days 1 hour ago) and read 3040 times:

Lots of Boeings have armpit lights, 747's, 757's 767's 727's, and 777's; I guess all Boeings have armpit lights. Airbuses, on the other hand never do. A300's and A310's have body lights on the sides near the front and lights under the wings like classic 737's. A320 family aircraft have only two lights on the underside where the wing meets the fuselage.
I am really into lights...


User currently offlineANA777master From United States of America, joined Mar 2004, 126 posts, RR: 0
Reply 6, posted (11 years 4 months 1 week 4 days ago) and read 3007 times:

Doesn't matter where the front lights are on the wing or fuselage, as long as there's anterior illumination.

User currently offlineWilliam From United States of America, joined Jun 1999, 1268 posts, RR: 0
Reply 7, posted (11 years 4 months 1 week 2 days 21 hours ago) and read 2940 times:

The taxi light answer does not make sense. In the DAYTIME,its not unusual seeing a MD80 or 737 with two pairs of lights on. Now if one of those pairs is for taxying,why have them on in the middle of the day?

And I have never,NEVER seen the armpit lights on Boeing widebodies.

Thank you for replying to this thread.


User currently offlineShaun3000 From United States of America, joined Mar 2002, 445 posts, RR: 0
Reply 8, posted (11 years 4 months 1 week 2 days 19 hours ago) and read 2911 times:

The more lights you have on the easier it is to see you, even in the middle of the day. There have been many times that I've seen another airplane only because its landing and/or taxi light was on.

User currently offlineWilax From United States of America, joined Jun 2002, 465 posts, RR: 3
Reply 9, posted (11 years 4 months 1 week 2 days 17 hours ago) and read 2903 times:

By "armpit" lights, I mean the landing lights located where the leading edge of the wing meets the fuselage, and yes, all current Boeings have them, although the ones on the 747 are located a little further out on the wing.

I also believe that it is common knowledge that taxi lights are those located on the nosegear. They are usually illuminated during taxi at night or in low visibility conditions. Once the aircraft is positioned on the runway for takeoff, usually, all the landing lights are illuminated just before beginning the takeoff roll. I have however noticed aircraft on takeoff and landing with only taxi lights on, but that is not the norm.

In the case of 757's, there are two sets of lights on the nosegear-one for taxi, one for landing-. On Fokker 28's, 70's, and 100's there are no lights located on the nosegear, but there are two retractable spotlamps on the underside of the nose. In most pictures one lamp is on during taxi and two during to/L. On Canadair RJ's there are no lights on the actual nosegear either but a set of double lights recessed into the underside of the nose.

I hope this clears things up...



User currently offlineWilliam From United States of America, joined Jun 1999, 1268 posts, RR: 0
Reply 10, posted (11 years 4 months 1 week 2 days 17 hours ago) and read 2907 times:

The pair of lights on a 737 classic and 300 series that are outboard under the wing,thats in the faring (by the flap guides as you stated) . Those lights too are considered landing lights then? So the older 737s( do not know about NGs,I have not seen them on my schematics) had two pairs of landing lights?

Just as the old 727 did with its armpit landing light and second one in the kruger flap half way down the wing.

And the MD80s has landing lights on the outer edges,and the lights next to the fuselage are just taxying lights though........Thanks Shaun for why they would be on during the day.

Thank you for answering my questions. I am a frequent flyer,and have spent countless hours waiting in the "conga" lines for departure at various airports. With that much time on your hands,you notice quirks like landing lights and the such.


User currently offlineBR715-A1-30 From , joined Dec 1969, posts, RR:
Reply 11, posted (11 years 4 months 2 days 18 hours ago) and read 2750 times:

All DC9s (10,20,30,40,50,80), MD90, and 717 have inboard, and outboard landing lights.

User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 12, posted (11 years 4 months 2 days 1 hour ago) and read 2757 times:

It's a dull post without the pics. People are getting lazy!

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-Alfredo


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