hotplane
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Q400 Anti-Collision Lights Question

Fri Jul 23, 2010 2:53 pm

Maybe a daft question that nobody knows the answer to, but thought I would ask anyway.

Why are the anti-collision lights on the top and bottom of the DHC8-Q400 fuselage/tail white and not red like all other civil airliners?
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oly720man
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RE: Q400 Anti-Collision Lights Question

Fri Jul 23, 2010 3:24 pm

I think that with FlyBe being a green airline the lights are low energy red LEDs under a clear cover rather than white bulbs under a red cover.


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hotplane
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RE: Q400 Anti-Collision Lights Question

Fri Jul 23, 2010 3:30 pm

Hmmm...the light in that shot is red, but all the Flybe machines I've seen definately have white ones.
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oly720man
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RE: Q400 Anti-Collision Lights Question

Fri Jul 23, 2010 5:55 pm

Digging a bit further, it looks like the fuselage top is red and the under fuselage and top of tail are high intensity white.


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dandaire
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RE: Q400 Anti-Collision Lights Question

Fri Jul 23, 2010 6:15 pm

I have seen certain Fokker aircraft also with white anti-collision beacons and wondered the same thing?
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hotplane
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RE: Q400 Anti-Collision Lights Question

Fri Jul 23, 2010 6:50 pm

Just realiszed something - I have only ever noticed the belly and tail light, not the roof one. Even stranger that they have two whites and one red!
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YYZatcboy
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RE: Q400 Anti-Collision Lights Question

Sat Jul 24, 2010 12:53 am

The one on the roof is the beacon, the ones on the tail and the belly are strobes. There are no strobes on the wings.
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stratosphere
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RE: Q400 Anti-Collision Lights Question

Sat Jul 24, 2010 6:52 am

Don't know about the Q but in the Saab 340 the strobes have 2 positions one is red and after t/o they go to high intensity and they turn white
 
T prop
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RE: Q400 Anti-Collision Lights Question

Sat Jul 24, 2010 6:59 am

The white anti collision lights are strobes, they're normally used when the aircraft is in flight or on a runway. The red beacon is a recognition light, they use this when taxiing around, no need to blind everyone with the strobes. There is one toggle switch that controls these lights, it has 3 positions: Red, off and white anti collision, it is not possible to have the anti collision and the red recognition light on at the same time.
 
Western727
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RE: Q400 Anti-Collision Lights Question

Sun Jul 25, 2010 2:39 pm

Quoting T prop (Reply 8):
it is not possible to have the anti collision and the red recognition light on at the same time.

Fascinating; thank you. Now, as others have wondered: why white to begin with? Why not "exclusively red" like everybody else? Even the 787 uses red.
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413X3
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RE: Q400 Anti-Collision Lights Question

Sun Jul 25, 2010 3:26 pm

Strange I could have sworn, in the US, it was a FAR that airplanes built after a certain year were required to have red anti-collision lights on at all times
 
shamrock137
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RE: Q400 Anti-Collision Lights Question

Sun Jul 25, 2010 3:46 pm

Quoting 413X3 (Reply 10):
Strange I could have sworn, in the US, it was a FAR that airplanes built after a certain year were required to have red anti-collision lights on at all times

I don't believe it specifies what color the lights must be. I know many new GA aircraft have ditched the red beacon in the tail altogether and just have the two white strobes on the wingtips. I'm personally not a big fan of this design as at night it can be very bright when they taxi on the ramp.
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AirframeAS
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RE: Q400 Anti-Collision Lights Question

Sun Jul 25, 2010 10:51 pm

Quoting hotplane (Thread starter):
Why are the anti-collision lights on the top and bottom of the DHC8-Q400 fuselage/tail white and not red like all other civil airliners?

The anti-collision light on all the Q's are one red "glow" light. They do actually have the red anti-collision light on top of the fuselage.

However, the Q100-300 have the strobe lights on the wing tips traditionally. The Q400's do not and were moved elsewhere on the airplane, above the tail and the undercarriage. Why they changed things on the Q400's is beyond me.

I have never seen a Q that had the red anti-collision "glow" light on and the strobe lights on at the same time ever.

I wonder why Bombardier decided to use the "glow" method for the red anti-collision light instead of the strobe flashing method.
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