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P/N Marking On Internal Wiring  
User currently offlineshiny From Germany, joined May 2012, 33 posts, RR: 0
Posted (1 year 7 months 1 week 2 days 20 hours ago) and read 1821 times:

Is there a requirement for internal (within a unit, say data recorder) wiring to be marked and if yes - above what length and what is the exact requirement stating that?

I am aware about general wiring, but specifically internal wires...?

8 replies: All unread, jump to last
 
User currently offlineairportugal310 From Palau, joined Apr 2004, 3608 posts, RR: 2
Reply 1, posted (1 year 7 months 1 week 2 days 19 hours ago) and read 1809 times:

I'd assume so. During a recent our of the A380 demonstrator, I noticed all the internal wiring was colored differently...would that be the "coding" as to what controls what?

Probably easier in my simplistic mind  



I sell airplanes and airplane accessories
User currently offlineshiny From Germany, joined May 2012, 33 posts, RR: 0
Reply 2, posted (1 year 7 months 1 week 2 days 19 hours ago) and read 1800 times:

No, I meant like a P/N marking, not functional identification marking.

User currently offlineAA737-823 From United States of America, joined Mar 2000, 5766 posts, RR: 11
Reply 3, posted (1 year 7 months 1 week 2 days 6 hours ago) and read 1693 times:

Quoting airportugal310 (Reply 1):
I'd assume so. During a recent our of the A380 demonstrator, I noticed all the internal wiring was colored differently...would that be the "coding" as to what controls what?

But no, he's talking about within an actual LRU, I believe, based on this:

Quoting shiny (Thread starter):
within a unit, say data recorder)

To answer your question, I don't know. Backshop would know. But, at least in my experience, I don't think wiring internal to the boxes is required to be marked in the same way as standard aircraft wiring.


User currently offlinelegs From Australia, joined Jun 2006, 239 posts, RR: 0
Reply 4, posted (1 year 7 months 1 week 1 day 22 hours ago) and read 1617 times:

Quoting AA737-823 (Reply 3):
Backshop would know.

Backshop monkey here. Im not sure of any requirements beyond manufacturers specs to mark wires inside LRU's. However, in my experience almost all LRU internal wiring is marked with wire numbers in the same basic fashion as the rest of the plane. Some aren't marked in quite the same way, having a more basic numbering scheme, but it would make my job a lot harder if they didnt have any markings at all. Some have printed sleeves at either termination, but most are laser printed.


User currently offlineshiny From Germany, joined May 2012, 33 posts, RR: 0
Reply 5, posted (1 year 7 months 1 week 1 day 22 hours ago) and read 1616 times:

Yes, my question was about LRUs.

Thanks for the responses. It seems that there is no certification requirement however for those to be marked? I'm specifically interested in unique P/N marking, not just type of wire and purpose marking...


User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 6, posted (1 year 7 months 1 week 1 day 22 hours ago) and read 1615 times:

Quoting shiny (Reply 5):
It seems that there is no certification requirement however for those to be marked?

Correct. The only certification requirement is that there be instructions for continued airworthiness (ICA's), which include stuff like the WDM's and CMM's. These are greatly simplified by having good wire identification but there is no explicit certification requirement to do so. However, if your manuals + markings were so poor that a normally trained mechanic could not reasonably be expected to maintain the system, the regulators would get upset with you and you'd have to do something.

Tom.


User currently offlineMD11Engineer From Germany, joined Oct 2003, 13985 posts, RR: 62
Reply 7, posted (1 year 7 months 1 week 1 day 21 hours ago) and read 1600 times:

Since wire counts a consumable (similar to standard screws, nuts or other smallparts), it won´t have a S/N on it (a P/N might be printed on it if space permits), but the P/N of the wire and the batch number will certainly be recorded somewhere in the assembly documentation of the LRU.

Jan


User currently offlinelegs From Australia, joined Jun 2006, 239 posts, RR: 0
Reply 8, posted (1 year 7 months 1 week 1 day 10 hours ago) and read 1524 times:

Quoting MD11Engineer (Reply 7):
(a P/N might be printed on it

Just about every type of aviation wiring I've ever used has the part number on it somehow. Often it is printed in light blue or green so as to be not confused with the wire number. Types like coax, triax and the like often have a thin strip of flexible plastic under the first layer of insulation with the part number printed on that.


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