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Wiring Diagrams Interpretation  
User currently offlineshiny From Germany, joined May 2012, 33 posts, RR: 0
Posted (2 years 10 months 2 days 14 hours ago) and read 7859 times:

I could use some help generally understanding the details on wiring diagrams. Would be thankful for your input.
Example: the WDM of a junction box of the intercom of a helicopter:

The junction box is physically a box with 4 round multiple-pin connectors.

[Edited 2013-07-03 01:17:41]

6 replies: All unread, jump to last
User currently offlineshiny From Germany, joined May 2012, 33 posts, RR: 0
Reply 1, posted (2 years 10 months 2 days 14 hours ago) and read 7860 times:

Could someone tell me:
1. What do the letters in the red circles mean?
2. What do P6 and P7 mean (blue circles)
3. How could there be different pins with the same denotation (yellow) and why do some have "

User currently offlinefr8mech From United States of America, joined Sep 2005, 6694 posts, RR: 16
Reply 2, posted (2 years 10 months 1 day 20 hours ago) and read 7700 times:

It would help to see the whole junction box on the diagram.

Without knowing the manufacturer's conventions, I can only make some educated guesses.

The red circled letters may be a connector designation.

The blue circled letters are the j-box's designation for that connector. It may even be labeled on the box itself.

The reason 2 pins can have the same designation is because they are on different connectors.

When seconds count...the police are minutes away.
User currently offlinenomadd22 From United States of America, joined Feb 2008, 2138 posts, RR: 0
Reply 3, posted (2 years 10 months 1 day 19 hours ago) and read 7686 times:

P6 and P7 are connector designations. The connector pin numbers seem to match, but the audio designations change for some reason. Maybe because two pieces of equipment use different schemes for designating audio lines. The yellow looks like highlighting by someone tracing a particular audio )audio 2/11) circuit. The red circles numbers would be a wild guess on my part. It's all guesswork with no reference or information.

User currently offlineshiny From Germany, joined May 2012, 33 posts, RR: 0
Reply 4, posted (2 years 10 months 1 day 14 hours ago) and read 7638 times:

My guess is just as fr8mech's! It makes sense this way.

How about the green stuff? I think it has something to do with the physical location of the connector/unit. It is not a STA however, but I noticed that equipment that is co-located has the same designation. But what does it mean? Can't even think of what "VU" could stand for.

User currently offlineLarshjort From Denmark, joined Dec 2007, 1940 posts, RR: 0
Reply 5, posted (2 years 10 months 1 day 11 hours ago) and read 7621 times:

All ATR panels have a number written like "xxxVU", eg the external panel for operating the cargo door is 5001VU.
The Electrical rack behind the Copilot is 80VU with the individual shelves named 81VU, 82VU, 83VU etc. and behind the captain the naming is 90VU with the shelves called 91VU and etc.

It wouldn't happen to be a Eurocopter product?

Best regards


139, 306, 319, 320, 321, 332, 34A, AN2, AT4, AT5, AT7, 733, 735, 73G, 738, 739, 146, AR1, BH2, CN1, CR2, DH1, DH3, DH4,
User currently offlineshiny From Germany, joined May 2012, 33 posts, RR: 0
Reply 6, posted (2 years 10 months 1 day 9 hours ago) and read 7596 times:

Yes it is EC  
So basically this gives the location of the connector/unit? I guess that only helps if you know where all the VUs are ...

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