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Airbus Strobes: R Wing Blinks Twice, L Wing Once?  
User currently offlineJogales From United States of America, joined Aug 2005, 437 posts, RR: 0
Posted (6 years 7 months 3 weeks 5 days 21 hours ago) and read 6870 times:

This has been covered in one or two posts before, but I haven't seen any real details on it.

I live under the approach path to TPA. Recently, a US A319 came over and the right wing strobed twice like is normal on an airbus, but the left wing only strobed once. I'm absolutely positive of this...I looked at the aircraft for a good long while and saw it from several angles as it passed overhead.

A few nights later, I saw the same thing happen again, but this time it was a US A321. The left wing strobe bulb was obviously still working as it blinked once in both cases, but what would cause it to only blink one time while the right strobe blinked twice? Are there actually two strobes that strobe one right after the other on each wing? If it matters, both wings and the tail strobed at the same time, then the right wing strobed again. If the strobe is still technically working, is there any requirement to fix it?

Another strobe related question...I saw a CO 752 come over tonight with only one strobe blinking. Does that mean that it burned out in flight, or are planes allowed to take off with one inop strobe? What about with all wing/tail strobes inop?


Inquiring minds want to know


Josh

[Edited 2008-01-30 21:19:42]


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17 replies: All unread, jump to last
 
User currently offlineLASOctoberB6 From Japan, joined Nov 2006, 2380 posts, RR: 1
Reply 1, posted (6 years 7 months 3 weeks 5 days 20 hours ago) and read 6845 times:



Quoting Jogales (Thread starter):
US A319



Quoting Jogales (Thread starter):
US A321.

I've also noticed that the wing strobes are pulsing differently on US' A32x series..

Quoting Jogales (Thread starter):
752

I don't know if it's me or the plane, but 757's and 767's strobe lights seem to pulse at different intervals and I've never been able to tell if they pulse, then a min or so later, it pulses again and the one after that seems to pulse at a different rate than the previous synced ones.. IDK...



[NOT IN SERVICE] {WEStJet}
User currently offlineRendezvous From New Zealand, joined May 2001, 516 posts, RR: 0
Reply 2, posted (6 years 7 months 3 weeks 5 days 19 hours ago) and read 6837 times:

The Airbus planes have two strobe bulbs in each wingtip. They flash in sequence, and therefor it looks like a double flash. It sounds like one of the bulbs needed to be replaced on the plane(s) your saw.

User currently offlineWILCO737 From Greenland, joined Jun 2004, 9039 posts, RR: 76
Reply 3, posted (6 years 7 months 3 weeks 5 days 17 hours ago) and read 6800 times:
AIRLINERS.NET CREW
HEAD MODERATOR

And the airbus has something like a strobe light syncronisation computer (or something like that)...

A computer you cannot live without: beacon once, strobes twice, all the time! So you can tell from a greater distance if its an Airbus or not Big grin

WILCO737 (MD11F)
 airplane 



It it's not Boeing, I am not going.
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 4, posted (6 years 7 months 3 weeks 5 days 15 hours ago) and read 6785 times:

Most Boeings strobe one flash at the time while most Airbus strobe has two continious flashes.
By the look of things....In the A320 one Bulb is Inop hence the single flash.


regds
MEL



Think of the brighter side!
User currently offlineWirelock From Spain, joined Sep 2007, 126 posts, RR: 0
Reply 5, posted (6 years 7 months 3 weeks 4 days 17 hours ago) and read 6576 times:

If the test confirms the fault in the LH WING TIP STROBE:

- replace the LIGHT-STROBE, L WING TIP 17LV
AMM TASK 33-48-14-000-001 and AMM TASK 33-48-14-400-001 .

(1) If the fault continues:

- replace the PWR SPLY UNIT-L WING TIP STROBE LIGHT 631 (15LV)
AMM TASK 33-48-38-000-001 and AMM TASK 33-48-38-400-001 .

(2) If the fault continues:

- do a check of the PWR SPLY-RELAY 12LV and replace it if necessary
if its not any of these then it the wiring....

regards,

wirelock


User currently online747fan From United States of America, joined Jun 2007, 1187 posts, RR: 1
Reply 6, posted (6 years 7 months 3 weeks 4 days 10 hours ago) and read 6536 times:



Quoting HAWK21M (Reply 4):
Most Boeings strobe one flash at the time while most Airbus strobe has two continious flashes.
By the look of things....In the A320 one Bulb is Inop hence the single flash.

The MD-11 and (I think) the DC-10 also have double strobes on the leading edges that flash quickly in sequence like Airbuses. I see UPS MD-11's on downwind for SDF fly over my house all the time, and occasionally I'll notice MD-11's with one or both of the strobes not working that are visible from behind the wings (after the plane has passed over). I've also noticed this with the 767/757, I'm also wondering about planes taking off with inop strobes.
Some UPS aircraft, namely the 747 classics and DC-8's, don't even have strobe lights on the wings. The 747's just have red rotating beacons on the top and bottom of the fuselage that flash/rotate in sequence (and of course nav light, landing lights, etc.). Maybe strobe lights weren't required until the 1980's?


User currently offlineIrish251 From Ireland, joined Nov 2004, 974 posts, RR: 4
Reply 7, posted (6 years 7 months 3 weeks 4 days 4 hours ago) and read 6496 times:



Quoting 747fan (Reply 6):
Maybe strobe lights weren't required until the 1980's?

Strobes only became a standard feature from about the mid-1970s and as a rule they were not retrofitted to aircraft built without them.


User currently offlineKELPkid From United States of America, joined Nov 2005, 6392 posts, RR: 3
Reply 8, posted (6 years 7 months 3 weeks 4 days 4 hours ago) and read 6489 times:

Quoting Jogales (Thread starter):
Another strobe related question...I saw a CO 752 come over tonight with only one strobe blinking. Does that mean that it burned out in flight, or are planes allowed to take off with one inop strobe? What about with all wing/tail strobes inop?

I can't speak for airliners and airlines, but over in the GA realm, strobes are optional equipment. The only night lighting legally required are nav lights, instrument panel lights, and the rotating beacon (hell, even the landing light is optional for part 91 operations at night   ). IIRC, strobes aren't on the list of stuff that absolutely has to work, unless it's a newer aircraft (like, say, mid-'90s on) and the manufacturer certified the strobes as part of the anticollision system. Of course, part 121 an airline's op specs are the ultimate authority in the case of airliners.

Any equipment required for dispatch will be on the MEL (minimum equipment list, not the cheeky mechanic from India who frequents the Tech/Ops forum     ).

[Edited 2008-02-01 14:07:55]


Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently online747fan From United States of America, joined Jun 2007, 1187 posts, RR: 1
Reply 9, posted (6 years 7 months 3 weeks 3 days 23 hours ago) and read 6444 times:



Quoting Irish251 (Reply 7):
Strobes only became a standard feature from about the mid-1970s and as a rule they were not retrofitted to aircraft built without them.

I do know that some aircraft from the early 1970's, such as the DC-10, L-1011, and DC-9 have strobes. I've also seen some Kalitta 747-100's from 1970-1971 with strobe lights, as well as some other 747-200's from the mid '70's (such as Evergreen).


User currently offlineKingAir200 From United States of America, joined May 2006, 1620 posts, RR: 2
Reply 10, posted (6 years 7 months 2 weeks 5 days 22 hours ago) and read 6190 times:



Quoting 747fan (Reply 9):
and DC-9 have strobes.

On NWA's DC-9 fleet, some -30s have strobes, I don't think any of the -40s do, and all -50s do.



Hey Swifty
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 11, posted (6 years 7 months 2 weeks 5 days 12 hours ago) and read 6122 times:



Quoting KELPkid (Reply 8):
Any equipment required for dispatch will be on the MEL (minimum equipment list, not the cheeky mechanic from India who frequents the Tech/Ops forum

Either way,No MEL on/working on Aircraft,No Aircraft departs  wink 

anyone aware of the type of strobe used on the A320 series.What manufacturer?

regds
MEL.



Think of the brighter side!
User currently offlineKELPkid From United States of America, joined Nov 2005, 6392 posts, RR: 3
Reply 12, posted (6 years 7 months 2 weeks 5 days 9 hours ago) and read 6096 times:



Quoting HAWK21M (Reply 11):
Either way,No MEL on/working on Aircraft,No Aircraft departs

So, MEL, are the strobes on your carrier's MEL?  eyebrow 



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineTristarSteve From Sweden, joined Nov 2005, 4010 posts, RR: 34
Reply 13, posted (6 years 7 months 2 weeks 5 days 9 hours ago) and read 6083 times:

BA A320 MEL

All strobe lights (white) may be inoperative.


User currently offline737tdi From United States of America, joined Sep 2007, 843 posts, RR: 1
Reply 14, posted (6 years 7 months 2 weeks 4 days 23 hours ago) and read 6015 times:
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I realize that this is probably old news to some but, have you noticed on the B737NG that the upper and lower anti-collision lights are sync'd and the wing and tail strobes are sync'd? It's an easy way to identify a NG/Classic in flight or taxi at night. Just thought I'd slide this in as info.. Noticed this some years back, we use it at work sometimes to visually identify aircraft reposition from the line to the hangar, NG/Classic.

737tdi


User currently offlineLASOctoberB6 From Japan, joined Nov 2006, 2380 posts, RR: 1
Reply 15, posted (6 years 7 months 2 weeks 4 days 11 hours ago) and read 5969 times:



Quoting 737tdi (Reply 14):
I realize that this is probably old news to some but, have you noticed on the B737NG that the upper and lower anti-collision lights are sync'd and the wing and tail strobes are sync'd? It's an easy way to identify a NG/Classic in flight or taxi at night. Just thought I'd slide this in as info.. Noticed this some years back, we use it at work sometimes to visually identify aircraft reposition from the line to the hangar, NG/Classic.

I'm not sure if I remember seeing an '37NG's tail and wing strobes synced. They've always seemed maybe a half a second behind each other..



[NOT IN SERVICE] {WEStJet}
User currently offlineBR715-A1-30 From , joined Dec 1969, posts, RR:
Reply 16, posted (6 years 7 months 2 weeks 3 days 20 hours ago) and read 5877 times:



Quoting KingAir200 (Reply 10):
On NWA's DC-9 fleet, some -30s have strobes, I don't think any of the -40s do, and all -50s do.

Are you talking about the wing strobes? Because I don't think any of their DC9s have Red Strobes.. Only rotating beacons


User currently offlineKingAir200 From United States of America, joined May 2006, 1620 posts, RR: 2
Reply 17, posted (6 years 7 months 2 weeks 3 days ago) and read 5832 times:



Quoting BR715-A1-30 (Reply 16):
Are you talking about the wing strobes? Because I don't think any of their DC9s have Red Strobes.. Only rotating beacons

Whites on the wingtips. The beacon on the DC-9 is nothing more than something you could put on the roof of your snowplow. Just a simple rotating beacon as you say.



Hey Swifty
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