空客A320飞机数将要达到10000架，由此，空客飞机MSN也将由4位变为5位，以前的MSN 0001将变为MSN 00001，相应的空客手册、软件都将做出更新。

空客飞机MSN

The A320 fleet is about to reach 10,000 units and so Airbus will be extending the four-digit MSN to five digits for all related A320 family documentation. These updates are set to cover a vast number of documents and data across many different Airbus operations. This MSN format change is a big job to undertake for such a large amount of data, however, Airbus confirms that this will be fully operational by the end of 2018.
We break down what's changed and what airlines need to do next.
What Changed?
The MSN format change is set to be updated across structured documentation in the following areas:
Engineering
Maintenance
Repair
Scheduled maintenance
Flight operations manuals
Data and software
What Has Airbus Already Done?
Airbus has already begun upgrading their own information systems as part of the format change. All its supply chain is ready to accommodate the change including the AirbusWorld apps and other products are now ready to deliver the updated technical publications.