jogales
Posts: 320
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Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Thu Jan 31, 2008 5:16 am

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]
-
 
LASoctoberB6
Posts: 1936
Joined: Thu Nov 09, 2006 4:23 pm

RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Thu Jan 31, 2008 6:39 am



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}
 
rendezvous
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Thu Jan 31, 2008 7:16 am

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.
 
wilco737
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Thu Jan 31, 2008 9:39 am

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)
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HAWK21M
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Thu Jan 31, 2008 10:53 am

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
I may not win often, but I damn well never lose!!! ;)
 
wirelock
Posts: 98
Joined: Fri Sep 14, 2007 12:55 pm

RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Fri Feb 01, 2008 8:58 am

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
 
747fan
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Fri Feb 01, 2008 4:11 pm



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?
 
iRISH251
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Fri Feb 01, 2008 9:53 pm



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.
 
KELPkid
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Fri Feb 01, 2008 10:04 pm

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 :-)
 
747fan
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Sat Feb 02, 2008 3:27 am



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).
 
KingAir200
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Thu Feb 07, 2008 4:21 am



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.
 
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HAWK21M
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Thu Feb 07, 2008 2:20 pm



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.
I may not win often, but I damn well never lose!!! ;)
 
KELPkid
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Thu Feb 07, 2008 4:44 pm



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 :-)
 
Tristarsteve
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Thu Feb 07, 2008 5:37 pm

BA A320 MEL

All strobe lights (white) may be inoperative.
 
737tdi
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Fri Feb 08, 2008 3:10 am

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
 
LASoctoberB6
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Fri Feb 08, 2008 3:21 pm



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..
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BR715-A1-30
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Sat Feb 09, 2008 6:17 am



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
Puhdiddle
 
KingAir200
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RE: Airbus Strobes: R Wing Blinks Twice, L Wing Once?

Sun Feb 10, 2008 1:54 am



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.

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