william
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737s And MD80s Have 2 Pairs Of Landing Lights,why?

Sat Apr 26, 2003 10:53 am

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.
 
Guest

RE: 737s And MD80s Have 2 Pairs Of Landing Lights,why?

Sat Apr 26, 2003 11:11 am

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
 
cdfmxtech
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RE: 737s And MD80s Have 2 Pairs Of Landing Lights,why?

Sat Apr 26, 2003 1:22 pm

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.
 
wilax
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RE: 737s And MD80s Have 2 Pairs Of Landing Lights,why?

Sat Apr 26, 2003 2:02 pm

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.
 
william
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RE: 737s And MD80s Have 2 Pairs Of Landing Lights,

Sun Apr 27, 2003 11:21 am

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.
 
wilax
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RE: 737s And MD80s Have 2 Pairs Of Landing Lights,why?

Mon Apr 28, 2003 4:31 am

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...
 
ANA777Master
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RE: 737s And MD80s Have 2 Pairs Of Landing Lights,why?

Mon Apr 28, 2003 5:38 am

Doesn't matter where the front lights are on the wing or fuselage, as long as there's anterior illumination.
 
william
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RE: 737s And MD80s Have 2 Pairs Of Landing Lights,

Tue Apr 29, 2003 8:58 am

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.
 
shaun3000
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RE: 737s And MD80s Have 2 Pairs Of Landing Lights,why?

Tue Apr 29, 2003 10:50 am

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.
 
wilax
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RE: 737s And MD80s Have 2 Pairs Of Landing Lights,why?

Tue Apr 29, 2003 12:52 pm

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...

 
william
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Joined: Thu Jun 10, 1999 1:31 pm

Wilax

Tue Apr 29, 2003 1:18 pm

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.
 
BR715-A1-30
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RE: 737s And MD80s Have 2 Pairs Of Landing Lights,why?

Tue May 06, 2003 11:28 am

All DC9s (10,20,30,40,50,80), MD90, and 717 have inboard, and outboard landing lights.
Puhdiddle
 
bio15
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RE: 737s And MD80s Have 2 Pairs Of Landing Lights,why?

Wed May 07, 2003 4:34 am

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