BaylorAirBear From United States of America, joined Jan 2005, 2913 posts, RR: 50
Reply 1, posted (8 years 8 months 1 week 1 day 13 hours ago) and read 7208 times:
A particular a/c does always have that particular c/n. It is the construction number given by manufacturers so that the plane's entire history can be traced in the event that the registration is changed, which isn't uncommon.
YOWza From Canada, joined Jul 2005, 4845 posts, RR: 16
Reply 3, posted (8 years 8 months 1 week 1 day 13 hours ago) and read 7201 times:
BaylorAirBear beat me to it but it's basically like a VIN number on a car. It is put on by the manufacturer and never changes regardless of how many different registrations it takes on it its working life.
YOWza From Canada, joined Jul 2005, 4845 posts, RR: 16
Reply 5, posted (8 years 8 months 1 week 1 day 13 hours ago) and read 7194 times:
Quoting CX777FAN (Reply 4): Does the cn then distinguish ac type? Or does the manuf. simply put them on in numerical order as aircraft come off the production line?
That I couldn't tell you for sure CX. I would imagine that varies from one manufacturer to another. I know in the auto industry some do it by production location, others by type, other by both and some just by date.
Anyone know the answer? Friends in Toulouse perhaps?
RobK From United Kingdom, joined Sep 2004, 3945 posts, RR: 18
Reply 6, posted (8 years 8 months 1 week 1 day 12 hours ago) and read 7194 times:
Airbus aircraft start at cn 1 and go up in sequence.
There are 4 families of Airbus aircraft :
A300/A310 currently up to cn 863
A318/A319/A320/A321 currently up to cn 2550(ish)
A330/A340 currently up to cn 700(ish)
A380 not yet in service obviously
Boeing aircraft work differently. They have block numbers, line numbers and construction numbers. The block numbers are for Boeing maintenance record keeping and they comprise of two letters and three numbers, eg. YM522 will be B737-700 VH-VBZ for Virgin Blue.
I'm not sure how the letters or numbers are allocated but basically all the Yx series belong to the 73NG's, Vx to the 767's, Nx to the 757's, Rx to the 747's, Wx to the 777's. The second letter seems to have something to do with the customer but several customers use the same letter. For example YJ is Continental, Ryanair, Qantas, COPA, Futura and some leasing companies. YK belongs to another group and so it goes on.
The numbers following them tend to go up in sequence for each new aircraft. For example, Ryanair's EI-DHA was YJ842, DHB YJ843, DHC YJ843, DHD YJ844 etc.
The line number is the sequence they come off the production line. Currently the 737's are at line 1780 (N222WN for Southwest). The 747's are at line 1363 (JA02KZ for Nippon Cargo). The 767's are at line 935 (JA613J for JAL). The 777's are at line 530 (F-GSQK for Air France).
The constructor number is different again and I have to admit this is where my knowledge ends as I don't understand the sequencing. I suspect it could be that when an airline places an order with Boeing they are immediately allocated the next number in the order book but I'm only guessing. This is a 5 digit number, for example B737-700 VH-VBZ is block number YM522, line number 1777, construction number 34322.
Philb From Ireland, joined May 1999, 2915 posts, RR: 13
Reply 9, posted (8 years 8 months 1 week 1 day 10 hours ago) and read 7118 times:
A c/n stays with an aircraft throughout its life.
There are exceptions. In the past, certain aircraft have been "rebuilt" from major bits of two or more and either put back into service or exhibited in museums. A number of DC3s, at least one Viscount and numerous smaller aircraft have been treated this way. Normally the c/n retained is that of the fuselage.
If a major upgrade or conversion is done to an airframe by another company and the type is then known by the conversion company's name and their type name, the c/n may be changed.
CV990 c/n 30-10-12 was not completed. Swissair CV990 HB-ICC was due to be c/n 30-10-38 and was sequenced behind 1963 deliveries. Delivered in January 1962 it was then allocated 30-10-12.
As others have stated there are various ways of allocating c/ns. Douglas/MDD civil airliners had a logical sequence of c/ns which were used across the range. However, close examination of the dates of manufacture shows the system often goes walkabout.
The following are DC10 c/ns. Gaps between blocks of numbers were used for DC8 or DC9 production.
46500-46525 were all built between 1970 and 1972 for American
46540-46543, the next DC10 c/ns, were built between 1979 and 1980.
46550-46582 were built 1972-1974
46583-46596 were built in 1979.
46600-46631 were built 1971-1975 for United
46632-46636 were built in 1979 for United
46640 was built in 1977
46645 was built in 1979
46646 was built in 1979
46660 was built in 1975
46661-46662 were built in 1976
46685-46686 were built in 1979
46700-46714 were built 1971-1974 mainly for National
The same situation exists with DC9s and, to a lesser extent with DC8s as the company sought to keep individual airlines' c/ns in some sort of sequence, filling the gaps later with production for other airlines if orders/options were cancelled
LH526 From Germany, joined Aug 2000, 2327 posts, RR: 14
Reply 11, posted (8 years 8 months 1 week 1 day 9 hours ago) and read 7105 times:
AIRLINERS.NET CREW FORUM MODERATOR
Don't forget Boeing shabit in designating the first customer in it's Aircraft number, for example a B737-500 delivered to Lufthansa would bear the correct number B737-530 as 30 is the custome code for Lufthansa, B763 delivered to LanChile is called B767-316 (Customer code LanCHile/LAN = 16) Today this habit reached alphanumerical figures such as B737-3E0.
So you can in most cases trace down the first customer by it's exact aircraft designation.
Trittst im Morgenrot daher, seh ich dich im Strahlenmeer ...
EMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 12, posted (8 years 8 months 1 week 1 day 9 hours ago) and read 7104 times:
You'll see the manufactures serial numbers sometimes in the registration numbers on the regional aircraft. Mesaba and American Eagle Saab 340's all have the manufactures serial number incorporated into their registration.
ie: Mesaba's N456XJ is Saab 340-456
"It's not the size of the dog in the fight, but the size of the fight in the dog"