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I understand that for most commercial aircraft, the source of the logo lights originates from the horizontal stabilizer which is projected onto the vertical stabilizer. However, I don't see how this could work for the CRJ 900 or other aircraft with a T-tail configuration. Can these aircraft also have logo lights, and if so where would the light originate from?

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    $\begingroup$ Surely a light can shine down from the horizontal stabilizer to the vertical stabilizer? $\endgroup$
    – Sanchises
    Commented Apr 18, 2023 at 6:51

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The Bombardier CRJ series has the logo lights installed on the engine pylons:

CRJ lights

E. Logo Lighting

A white logo light is installed on the upper surface of each engine pylon to illuminate the airline logo on each side of the vertical stabilizer. The lights are controlled by a LOGO switch on the EXTERNAL LTS panel.

CRJ lights panel

(Bobmardier CRJ-700/-900 FCOM - Lighting)

Some other aircraft with a T-tail have the logo lights installed on the lower surface of the horizontal stabilizer, e.g. the Dash-8 Q400:

Q400 Tail lights

12.14.5.8 Logo Lights

White logo lights are installed flush with the bottom left and right horizontal stabilizers. The logo lights supply lighting for the logo on the vertical stabilizer.

(Bombardier Dash-8 Q400 FCOM - Lighting System)

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  • $\begingroup$ on 737s (at least the older ones) the logo light is out on the wingtip. $\endgroup$
    – Anilv
    Commented Apr 18, 2023 at 8:16
  • $\begingroup$ @Anilv That's weird, never heard of that before. Newer ones have them on the horizontal stabilizer. But the 737 is not a T-tail of course. $\endgroup$
    – Bianfable
    Commented Apr 18, 2023 at 8:39
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    $\begingroup$ This link shows how some 737 classics had logo lights installed on the wingtips, although it was an option & plenty of classics didn't have them. All NG & Max 737s, AFAIK, have logo lights, which are on the horizontal stab. $\endgroup$
    – Ralph J
    Commented Apr 18, 2023 at 16:14
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    $\begingroup$ And this photo shows what the light on the wintip itself looked like on those Classics which had them. $\endgroup$
    – Ralph J
    Commented Apr 18, 2023 at 16:23

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