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773 Bulb Burn Out After Only 3 Days?!?  
User currently offlineHighFlyer9790 From United States of America, joined Jul 2005, 1241 posts, RR: 0
Posted (7 years 4 months 5 days 5 hours ago) and read 4199 times:


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any idea why AC's new 773 would have one of its runway turn off lights burnt out already after only a few days into her new life? am i missing something?


121
30 replies: All unread, showing first 25:
 
User currently offlineTristarsteve From Sweden, joined Nov 2005, 3998 posts, RR: 34
Reply 1, posted (7 years 4 months 5 days 5 hours ago) and read 4186 times:

They are taxi lights, and theyseem to crack all the time.
I assume its stone damage, but the lenses are cracked, and those lights need changing 20 x more often than any other exterior light.


User currently offlineFlipdewaf From United Kingdom, joined Jul 2006, 1568 posts, RR: 1
Reply 2, posted (7 years 4 months 5 days 5 hours ago) and read 4171 times:
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Interesting, although components are more likely to be unreliable toward the start of their life. I suppose thats why they dont just have the one.

Fred


User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 3, posted (7 years 4 months 5 days 2 hours ago) and read 4100 times:

Quoting HighFlyer9790 (Thread starter):
any idea why AC's new 773 would have one of its runway turn off lights burnt out already after only a few days into her new life? am i missing something?

Am I missing something...?? I see all three lights working..........and what is a 'runway turn off light'...?? I'm thinking like other bigger aircraft I've seen the upper two are landing lights, the lower light is the taxi light. Also, looking at other photos in the data base I several other a/c with the same configuration, so it may be a switch controlled deal.

[Edited 2007-04-19 03:50:36]


"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineBoeingFixer From Canada, joined Jul 2005, 530 posts, RR: 0
Reply 4, posted (7 years 4 months 4 days 23 hours ago) and read 4016 times:

AFAIK, the 773 has 2 nose gear taxi lights and 2 nose gear landing lights. One of them appears to be burnt out.... no big deal as it has nothing to do with the aircraft in general. Landing and taxi lights burn out all the time so this is a non-issue. Light bulb replacement is probably one of the highest maintenance discrepancy entries in the business.

Cheers,

John



Cheers, John YYC
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 5, posted (7 years 4 months 4 days 22 hours ago) and read 3982 times:

Looks like one Taxi light is u/s.
Reason could be burnt filament/CB popped out or FOD.

Quoting EMBQA (Reply 3):
what is a 'runway turn off light'

Runway Turn off light is angled from the Aircraft centreline & illuminates the area just forward & side.It covers the direction the Aircraft will turn into.

regds
MEL



Think of the brighter side!
User currently offlineBAe146QT From United Kingdom, joined Sep 2006, 996 posts, RR: 0
Reply 6, posted (7 years 4 months 4 days 20 hours ago) and read 3966 times:

Quoting Flipewaf:
Interesting, although components are more likely to be unreliable toward the start of their life.

Agreed. We call that the "bathtub curve". Imagine a graph where the X axis is time and the Y axis is probability of failure.

Very new and very old components are statisitcally more likely to go pop. So the graph looks like a cross-section of a bathtub.



Todos mis dominós son totalmente pegajosos
User currently offlineFlipdewaf From United Kingdom, joined Jul 2006, 1568 posts, RR: 1
Reply 7, posted (7 years 4 months 4 days 17 hours ago) and read 3901 times:
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Quoting BAe146QT (Reply 6):
Very new and very old components are statisitcally more likely to go pop.

go pop! i like that way of putting it, il use it more in future. we use the bath tub model at uni, i hate doing reliability though its such a faf on.

Fred


User currently offlineBAe146QT From United Kingdom, joined Sep 2006, 996 posts, RR: 0
Reply 8, posted (7 years 4 months 4 days 16 hours ago) and read 3891 times:

Ah - looks like I was giving egg-sucking instructions then  Wink To be honest we only use it in the loosest sense - it's not like we're worried about component reliability enough to have real metrics. Not in my department at least. The support guys probably take a different view - especially when they've swapped out a Gigabit NIC for the 40,000th time.

Quoting Flipdewaf:
go pop! i like that way of putting it,

Surprised you've not heard that before - there's loads of variations.



Todos mis dominós son totalmente pegajosos
User currently offlineGlobalATL From , joined Dec 1969, posts, RR:
Reply 9, posted (7 years 4 months 4 days 3 hours ago) and read 3653 times:

Quoting HighFlyer9790 (Thread starter):
one of its runway turn off lights burnt out already

I noticed too. Its a brand new plane! The bulb must be second-hand!  

[Edited 2007-04-20 02:56:45]

[Edited 2007-04-20 02:57:26]

User currently offlineFlyabunch From United States of America, joined Nov 2004, 517 posts, RR: 4
Reply 10, posted (7 years 4 months 3 days 23 hours ago) and read 3591 times:

Quoting GlobalATL (Reply 9):
I noticed too. Its a brand new plane! The bulb must be second-hand!

Maybe not second-hand, but certainly from the low bidder for the supply item!

Mike


User currently offlineMetroliner From United Kingdom, joined Jan 2007, 1067 posts, RR: 1
Reply 11, posted (7 years 4 months 3 days 15 hours ago) and read 3522 times:

one thing - do the pilots have any way of seeing from the cockpit (in the form of a master caution light or something) that one of the bulbs has blown out? not particularly serious, in the case of a taxi light, but if a landing light blows i'm sure it would be nice to know about it!

toni



Set the controls for the heart of the Sun
User currently offlineFlipdewaf From United Kingdom, joined Jul 2006, 1568 posts, RR: 1
Reply 12, posted (7 years 4 months 3 days 15 hours ago) and read 3519 times:
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Quoting Flyabunch (Reply 10):
Quoting GlobalATL (Reply 9):
I noticed too. Its a brand new plane! The bulb must be second-hand!

Maybe not second-hand, but certainly from the low bidder for the supply item!

Mike

It'll be the same as the other bulbs on T7's just that components are less reliable when new, a component is much more likely to fail in the first week than after 6 years.

Fred


User currently offlineTristarSteve From Sweden, joined Nov 2005, 3998 posts, RR: 34
Reply 13, posted (7 years 4 months 3 days 13 hours ago) and read 3505 times:

Actually the large lamps on aircraft are all the same.
Landing lights Q4559X are fitted to B737 B757 B767 B777 and A320 and more.
So are the taxi light in question Q4554 is the same pt nbr as the taxi light on the A320.
Most of these lamps come from GE.

Quoting Metroliner (Reply 11):
do the pilots have any way of seeing from the cockpit (in the form of a master caution light or something) that one of the bulbs has blown out? not particularly serious,

No. We change many more lamps in the winter, when the pilots can see they are not working, than in the summer, when they can't!


User currently offline777WT From United States of America, joined Jan 2005, 875 posts, RR: 1
Reply 14, posted (7 years 4 months 3 days 8 hours ago) and read 3418 times:

Quoting TristarSteve (Reply 13):
Landing lights Q4559X are fitted to B737 B757 B767 B777 and A320 and more.

Even that's the same part # for a ERJ-145 nose landing light.


User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 15, posted (7 years 4 months 2 days 21 hours ago) and read 3312 times:

Quoting TristarSteve (Reply 13):
No. We change many more lamps in the winter, when the pilots can see they are not working, than in the summer, when they can't!

What about night ops.
regds
MEL



Think of the brighter side!
User currently offlineTristarSteve From Sweden, joined Nov 2005, 3998 posts, RR: 34
Reply 16, posted (7 years 4 months 2 days 18 hours ago) and read 3286 times:

Quoting HAWK21M (Reply 15):
What about night ops.

In Sweden it doesn't get dark until midnight in the summer. We don't have any night ops!

On the single aisle Airbus, there are four lights on the nose leg. A taxi light, a Take-off light, and two runway turnoff lights.
The Landing lights are in the wingroot. The landing lights are angled down. When the aircraft is parked, they shine on the ground just forward of the nose. I had a pilot write them up recently. "Landing lights point downwards" Answer was. " They are meant to, they are landing lights!" The take off light points forwards for take off.
On Boeings, the nose leg landing lights point more forwards so are used for take off as well. The runway turn off lights on Boeings are fitted in the wing root.

Another strange thing about landing/taxi lights is the voltage. Look in the wiring manual, they are strange. You often get 28vAC lights wired up to 115vAC supply through a transformer. I wonder why? Why not have 115vAC lights?


User currently offlineMetroliner From United Kingdom, joined Jan 2007, 1067 posts, RR: 1
Reply 17, posted (7 years 4 months 2 days 15 hours ago) and read 3261 times:

Quoting TristarSteve (Reply 13):
No. We change many more lamps in the winter, when the pilots can see they are not working, than in the summer, when they can't!

thank you. some very interesting info there!



Set the controls for the heart of the Sun
User currently offlineBrettbrett21 From United Kingdom, joined Jun 2004, 436 posts, RR: 0
Reply 18, posted (7 years 4 months 1 day 7 hours ago) and read 3123 times:

Quoting TristarSteve (Reply 16):
The Landing lights are in the wingroot. The landing lights are angled down. When the aircraft is parked, they shine on the ground just forward of the nose. I had a pilot write them up recently. "Landing lights point downwards" Answer was. " They are meant to, they are landing lights!"

You have got to be joking!



i'm so excited i wish i could wet my pants!
User currently offlineKaddyuk From Wallis and Futuna, joined Nov 2001, 4126 posts, RR: 26
Reply 19, posted (7 years 4 months 1 day 5 hours ago) and read 3086 times:

Quoting HighFlyer9790 (Thread starter):
any idea why AC's new 773 would have one of its runway turn off lights burnt out already after only a few days into her new life? am i missing something?

This aircraft has been in production for months... including i dont know how many hours flight testing & route proving... Just because its only been in active service for 3 days doesnt mean the aircraft popped out of a mystical vortex with every component being brand new and produced on exactly the same date...



Whoever said "laughter is the best medicine" never had Gonorrhea
User currently offlineSlovacek747 From , joined Dec 1969, posts, RR:
Reply 20, posted (7 years 4 months 1 day 3 hours ago) and read 3062 times:

Off topic but, how does AC like their 777 so far? Are the economics/fuel burn what they thought they would be?

Slovacek747


User currently offlineFlipdewaf From United Kingdom, joined Jul 2006, 1568 posts, RR: 1
Reply 21, posted (7 years 4 months 1 day 1 hour ago) and read 3035 times:
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Quoting Slovacek747 (Reply 20):

adding to this, do planes have run in times like cars do? will they be running at maximim efficiency yet?


Fred


User currently offlineSchooner From United Kingdom, joined Oct 2001, 139 posts, RR: 0
Reply 22, posted (7 years 4 months 15 hours ago) and read 2974 times:

Quoting HighFlyer9790 (Thread starter):
They are taxi lights, and theyseem to crack all the time.
I assume its stone damage, but the lenses are cracked, and those lights need changing 20 x more often than any other exterior light.

or perhaps they havent turned on one of the turn-off lights. In the 757 at least they are independantly switchable.

Cheers.



Untouched and Alive
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 23, posted (7 years 4 months 13 hours ago) and read 2961 times:

Quoting TristarSteve (Reply 16):
The landing lights are angled down



Quoting TristarSteve (Reply 16):
Landing lights point downwards

On Single Aisle ie A320 Family.Is this on any other types.Found it odd that theres seperate Take off & Landing lights.

Quoting TristarSteve (Reply 16):
You often get 28vAC lights wired up to 115vAC supply through a transformer. I wonder why? Why not have 115vAC lights

Isn't it because the Reley operation with 28vac is less & safer Weight & consumption wise.

regds
MEL



Think of the brighter side!
User currently offlineTom775257 From United Kingdom, joined Dec 2000, 153 posts, RR: 0
Reply 24, posted (7 years 4 months 12 hours ago) and read 2945 times:

Having flown two new jets, one 1 week old, and one 3 weeks old; these had the most deferred defects of any aircraft in the fleet at the time.

25 TristarSteve : Read what you quote. They are taxi lights on a B777, one switch. On a A320 they are turn off lights, one switch. On B777 the turn off lights are in t
26 Dl757md : There are many possibilities for the INOP taxi light in this photo. It could be as has already been said FOD damage that cracked the lens and led to p
27 JohnM : The bulbs have a short life due to overheating also. If they are left on a bit too long without airflow, they get very hot, and no air to carry the he
28 Schooner : Duuh, sorry mate, had just woken up after getting back from a night AYT, not entirely with it there! Cheers.
29 B78710 : also when you do up the locking rings around lamps too tight, combined with being heated up and cooled to very low temps it can cause them to crack or
30 HAWK21M : Thermal Expansion. On the 737NGs the Landing lights below the Fusdelage are suseptible to FOD & water slosh. regds MEL
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