c5load
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Wing Strobes On The DC-9-30

Mon Jul 19, 2010 2:13 pm

I was spotting over at BWI about a week ago and saw a DC-9-30 from DTW come in. It looked cool in the old NWA colors, but that's beside the point. Unless I was crazy and saw things, it didn't have normal flashing wingtip strobes. Instead, they seem to rotate back and forth similar to the acl. Was this how the early strobes were?
"But this airplane has 4 engines, it's an entirely different kind of flying! Altogether"
 
LAXintl
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RE: Wing Strobes On The DC-9-30

Mon Jul 19, 2010 4:36 pm

Yes, LED technology is rather new.
Navigation beacon and strobes in the past were simply high intensity bulbs.
From the desert to the sea, to all of Southern California
 
KELPkid
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RE: Wing Strobes On The DC-9-30

Mon Jul 19, 2010 7:56 pm

Quoting LAXintl (Reply 1):
Navigation beacon and strobes in the past were simply high intensity bulbs.

  

Strobes are not bulbs. Strobes are (were?   ) tubes filled with Xenon gas that had two electrodes (one at either end of the tube). To make a strobe go "blink", you apply a high electrical voltage, which causes the Xenon gas therein to emit a bright light as the outer electrons in the gas go to a higher energy state and then release the light when they return to their previous state... Nowadays, though, new "strobes" are just really bright LED's. However, many genuine strobe installations remain in service, not only on older planes, but also on ambulances, fire engines, even fire alarms in buildings.
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LAXintl
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RE: Wing Strobes On The DC-9-30

Mon Jul 19, 2010 10:17 pm

No early strobes like lighting was very much bulbs.
On older aircraft, like props, 707, and even maybe early 747s as I recall, they were simply most often paired white bulbs that would cycle on off. No fancy xenon as stroboscopic lighting systems did not come into being till the early 1960s.

It was not until 1971 when FAA/CAA and later ICAO came up with standard that required stroboscopic lighting to flash about 60-times per minute at some minimum candela value and gave manufacturers till 1976 to be in compliance. As I recall the L-1011 was the first US aircraft certified that met that standard.
From the desert to the sea, to all of Southern California
 
stratosphere
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RE: Wing Strobes On The DC-9-30

Tue Jul 20, 2010 3:31 am

Actually the wing strobe you see today was invented by a former NWA pilot named Harold 'Bill" Atkins and this article says it was first used on the DC-10.
http://www.albertleatribune.com/news...-made-aviation-safer-for-everyone/
 
stratosphere
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RE: Wing Strobes On The DC-9-30

Tue Jul 20, 2010 3:39 am

Quoting c5load (Thread starter):
I was spotting over at BWI about a week ago and saw a DC-9-30 from DTW come in. It looked cool in the old NWA colors, but that's beside the point. Unless I was crazy and saw things, it didn't have normal flashing wingtip strobes. Instead, they seem to rotate back and forth similar to the acl. Was this how the early strobes were?

Yes early DC-9's and even early 727's have an oscillating light instead of a strobe. At NW it was only some of the -30 models that had them the 40-and 50's had strobes.
 
bohica
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RE: Wing Strobes On The DC-9-30

Tue Jul 20, 2010 3:46 am

Quoting stratosphere (Reply 5):
Yes early DC-9's and even early 727's have an oscillating light instead of a strobe.

IIRC some DC-8's also had the oscillating wingtip lights.
 
atpcliff
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RE: Wing Strobes On The DC-9-30

Sat Jul 24, 2010 5:39 pm

Hi!

I was recently flying a DC-9-34F that had wingtip white strobe lights. It was the only DC-9 I had flown with strobes. The others were older -3X models and DC-9-1X models.

cliff
LFW
TRY. It's all you have control over, and it's what God wants.
 
Western727
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RE: Wing Strobes On The DC-9-30

Sat Jul 24, 2010 9:25 pm

Quoting bohica (Reply 6):
some DC-8's also had the oscillating wingtip lights

Indeed. I saw them on a DC-8 freighter yesterday at DFW. Sparked a sense of nostalgia.
Jack @ AUS
 
Western727
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RE: Wing Strobes On The DC-9-30

Sun Jul 25, 2010 2:05 pm

Quoting western727 (Reply 8):
I saw them on a DC-8 freighter yesterday at DFW.

Thinking more about it, this same DC-8 also had its green forward starboard wingtip light lit by an oscillating light, like some of the DL Shuttle 727s I watched at DCA back in college. I was slightly bummed that the DC-8's red forward port wingtip light was stationary and that the red ACLs were both strobes. After all, those select DL Shuttle 727s had both the oscillating red/green wingtip lights and rotating ACLs...very cool to watch for it made the aircraft almost seem "alive". Then again, we all know it's perfectly natural for old aircraft to be a patchwork of different types of lights after going through "millions" of MRO cycles.

Anyway - question: why did some of those early aircraft have oscillating red/green forward wingtip lights while the norm has long been to have them stationary?
Jack @ AUS
 
AA737-823
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RE: Wing Strobes On The DC-9-30

Mon Aug 02, 2010 12:45 pm

Quoting LAXintl (Reply 3):
On older aircraft, like props, 707, and even maybe early 747s as I recall,

The old girls I've worked on all had a single, stationary bulb, and a rotating chrome reflector. Kind of a pain, because the motor to the rotating reflector went out almost as often as the bulb did. And on the upper deck of the 747, you must go through the cabin ceiling panels to replace it. Which always happens in January, which means that you're going to let snow and deice fluid into the cabin, or at least into your eye.
 
Western727
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RE: Wing Strobes On The DC-9-30

Mon Aug 02, 2010 3:56 pm

Quoting AA737-823 (Reply 10):
Which always happens in January, which means that you're going to let snow and deice fluid into the cabin, or at least into your eye.

Murphy really likes to become a burden in the aviation world, no?  
Jack @ AUS

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