How to Properly Form an N-Number:
N-Numbers consist of a series of alphanumeric characters. U.S. registration numbers may not exceed five characters in addition to the standard U.S. registration prefix letter N. These characters may be:
To avoid confusion with the numbers one and zero, the letters I and O are not to be used.
Page Last Modified: 03/19/13 14:20 EDT
This page can be viewed online at: http://www.faa.gov/licenses_certificates/aircraft_certification/aircraft_registry/forming_nnumber/