AVSIG: Strobing Runway Lights wwswsigarch.jpg (7236 bytes)

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AVSIG Discussion Sections >> Training & Proficiency

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Scott Dyer [HPN/NY]
Top Gun


Reged: 01/11/03
Posts: 20065
Re: Strobing Runway Lights [Re: Ward Miller POU-NY]
      #446053 - 12/20/17 09:17 PM

Quote:

Scott, along this line is programming product "undocumented features". Many
times customers would find some neat way to accomplish a task using something
not listed as a feature in the programming product. Then we would come out
with an update, featuring new functions and correcting bugs. Sometimes this
would kill some of the "undocumented features" some customers were using.

Out first reaction might be, Tough bananas! But they were paying customers,
so, with very few exceptions, we soon (!) came out with an update that
allowed those features to again be performed (and documented them).




Ward -- Indeed, and I'm surprised that nearly 10 years after the problem was identified that those paying customers haven't been sufficient impetus to work a fix.

--------------------
www.scottdyercfi.com


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Bob Dubner
Super Imperial Member


Reged: 08/31/01
Posts: 4759
Loc: Extreme Upper West Side
Strobing Runway Lights [Re: Russell Holton]
      #446061 - 12/21/17 01:36 AM

Russell, Scott has the right of it.

LEDs are being used instead of incandescents because they are cheaper.

But they *are* being sold as *replacements* for incandescents. There is a
built in assumption that a replacement should function the same way as the
thing being replaced.

If they don't function the same way, then they aren't replacements.

In other words, if they are sold as replacements, the functional spec is that
they have a similar radiation profile to the bulbs being replaced.

It's not enough that they are cheaper. They have to work the same way.
<shrug> The need for radiation in the IR spectrum could easily have been
anticipated. I feel sure there are phosphors that re-radiate in that band.
It could have been done. It should have been done.

I suspect that when an accident results from the changed performance of
something marketed as an improved replacement bulb, the plaintiffs in the
resulting lawsuit will prevail.


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Terry Carraway
Top Gun


Reged: 06/02/04
Posts: 7098
Loc: Maryland
Re: Strobing Runway Lights [Re: Bob Dubner]
      #446161 - 12/23/17 10:27 PM

There are also IR emitting LEDs. Used as illuminators in many NVGs.

So adding one IR LED to the array would also solve the "problem."

--------------------
Terry
Mostly 0W3


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Russell Holton
AVSIG Member


Reged: 07/07/05
Posts: 14136
Re: Strobing Runway Lights [Re: Terry Carraway]
      #446183 - 12/24/17 06:54 PM

Quote:

There are also IR emitting LEDs. Used as illuminators in many NVGs.

So adding one IR LED to the array would also solve the "problem."



If that's the desired solution, yes, it wouldn't be that hard. IIRC, IR LEDs were one of the first and may have even been before red LEDs. So, it's not a technology problem.

But it remains to be seen what the motivation for change will be. Clearly two different regulatory agencies are aware of the problem, and even at their slow pace you would have thought something would have been done by now.


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Terry Carraway
Top Gun


Reged: 06/02/04
Posts: 7098
Loc: Maryland
Re: Strobing Runway Lights [Re: Russell Holton]
      #446197 - 12/25/17 07:20 AM

The first high profile mishap.

And everyone will be yelling and screaming, and finger pointing.

And then, with will start working on a solution.

--------------------
Terry
Mostly 0W3


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John O'Shaughnessy [FCM]
Top Gun


Reged: 09/13/01
Posts: 5059
Loc: Minnesota
Re: Strobing Runway Lights [Re: Russell Holton]
      #446207 - 12/25/17 10:02 AM

Quote:

But it remains to be seen what the motivation for change will be. Clearly two different regulatory agencies are aware of the problem, and even at their slow pace you would have thought something would have been done by now.




I expect it'll only be addressed when it looks to be a profitable venture.


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Tom Charlton
Top Gun


Reged: 04/28/04
Posts: 2221
Loc: The west coast of Florida
Re: Strobing Runway Lights [Re: John O'Shaughnessy [FCM]]
      #446211 - 12/25/17 12:35 PM

Quote:

Quote:

But it remains to be seen what the motivation for change will be. Clearly two different regulatory agencies are aware of the problem, and even at their slow pace you would have thought something would have been done by now.




I expect it'll only be addressed when it looks to be a profitable venture.


Hi John,

Hear tell rules are typically written in blood?<ng>

Regards,
Tom Charlton

--------------------
The airplane has unveiled for us the true face of the earth. Antoine de Saint-Exupéry, 1939.


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Russell Holton
AVSIG Member


Reged: 07/07/05
Posts: 14136
Re: Strobing Runway Lights [Re: John O'Shaughnessy [FCM]]
      #446213 - 12/25/17 02:06 PM

Quote:

I expect it'll only be addressed when it looks to be a profitable venture.



Cost-wise, it's cheap enough. The question is one of marketing and demand.

I think the heliports might be interested, but the rest may not.


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