View Full Version : 737 Tech Question on Ext Lighting
ptwaugh
4th May 2002, 01:44
In designing the lighting system of a 3D scale 737 I am wondering about the exact number and positions of external lights on the 737-400.
My understanding is there are:
2 Anticollision Beacons (one top, one bottom)
1 Fixed white lights, 1 white strobe, each trailing wingtip
(are these white lights called anticollision or markers?)
1 red position light port wing tip, 1 green position starboard
1 white position strobe aft fuselage
3 taxiway lights (nose, and each wing faring)
2 vertical stabalizer logo lights.
3 wheel well lights
Questions:
Are there also strobes on the red/green position lights?
Are the white wingtip position lights steady, strobe or both?
Is the aft position light strobe, steady or both?
Any lights I missed?
Thanks for any insight or links to tech drawings. Anyone tell me why SWA disabled their tail light? Also, I understand their landing lights "flash". Do they go completely off or just flash?
Thanks again,
Patrick
Slasher
4th May 2002, 05:12
* each nav-light port is comprised of 2 lights, one fwd one aft (redundancy)
* the stab logo lights are located at each main wing-tip aft
* 4 wheel-well lights total: 2 flood lights and 2 gear inspection lights
* white aft stab-tip nav lights (if fitted) are fixed and dont flash
* some 737s have a single rudder-strobe fitted
* yes strobes are located on the red/green position lights forward of the respective forward nav-light
* wing-ilumination lights located on the fuselage just forward of the leading-edges
* inboard landing lights located in the same housing as the runway-turnoff (taxi) lights
* outboard landing lights located on the 3rd (furthest outboard) flap-fairing. They extend out of and retract into this fairing.
* 1 nosewheel-bay flood light located on the bays forward wall, and one inspection-light located above the nose-gear assembley
And if your pedantic:
2 emergency exterior flood-lights located on both sides of the fuselage just aft of the main wing trailing edge, abeam the first closest inboard flap fairing (these lights are through the emergency-lighting system).
ptwaugh
4th May 2002, 05:28
So, if I understand you correctly:
The Nav-lights consist of:
1 fwd, 1 aft wing tip in fixed white (for redundancy)
(or did you mean that each "light" has two bulbs?)
So say the port wing tip to down view:
W---------------
R-
-
w
-
-
w
s--------------------
W = A White Strobe, R = Red Position Light
w = A white fixed nav light
s = stab logo light illuminating the stab
Are the strobes co-located with the red/green pos lights red & green? or just white strobes too?
Thanks for your input.
Patrick
Slasher
4th May 2002, 05:52
Down view left wing:
common 1 unit housing. Yes each nav-light has 2 bulbs, with a single strobe-light in between them. If say you want to replace any of these lights you remove the same single common glass-housing that covers all 3 of them -
(fwd Red)--------------------------------Engine
(white-flashing strobe)---------------
(aft red)----------------------------------
------------------------leading edge of wing------------------
(navlight\
strobe <--------------- 1 unit housing
housing)
------------------------trailing edge of wing-------------------
[] <------ logo light mounting attached to aft wingtip
[] <------ location of logo light itself (shines sideways, backwards, and up onto fin)
eng1170
6th May 2002, 08:02
some other lights which may only be specific to our aircraft but i wouldnt have thoght so include - small circular escape slide illumination lights just aft of all 4 main deck doors approx half way up height of door, between the 2 overwing hatches on the -400 there is an escape light which is just above the lower edge of the hatch sills. I am not 100% sure but am fairly postive there is alos a leading edge/engine insp light fwd and above the wing root at the leading edge - i will check this this afternoon and get back to you.
Hope this is of some help
eng1170
6th May 2002, 08:07
Sorry Slasher, i've just re-read your post and yup - those l/e illum lights are there!!:)
captainmacuk
10th May 2002, 15:05
hi
when i was flying ezy i was sitting parrallel with the trailing edge of the wing, when takeoff and landing i noticed small circular lights coming down for t/off and landing at the far end of the wing attached in a hanging position, what are they, are they extra landing lights, is this on all a/c, or just ezy policy
cheers
Slasher
10th May 2002, 20:08
captainmacuk read the 9th item on my first post.
ptwaugh
18th May 2002, 04:50
I'd really love a close up of the wingtip lights including the logo light if possible.
Anyone having one, can email <
[email protected]>
Thanks
CaptainSandL
18th May 2002, 11:37
Several wingtip photos are available at www.b737.org.uk/wingtips.htm and description of lights at http://www.b737.org.uk/aircraft_general.htm
S & L