Question & AnswerQ&A (BOC MEMORANDUM ORDER NO. 17-95)
The main objective is to provide a new registry numbering scheme to be adopted by all airlines for the pre-generation of registry numbers, to readily identify to which airline a registry number belongs for control purposes, and to make registry numbers available in advance to all BOC units concerned.
Registry numbers shall be alphanumeric, consisting of three alphabetic characters (the Airline Prefix Code) followed by four numeric characters representing the sequence of aircraft arrivals.
Airlines using two alphabetic prefix codes must add 'A' as the third letter until IATA issues new prefix codes.
Registry numbers for scheduled flights consist of the airline’s three-letter prefix followed by a four-digit sequential number starting from 0001 for the first scheduled arrival each year, incrementing with each flight.
For unscheduled or special flights, the numeric portion starts with '9' followed by three digits starting at 000, incremented by one for each special arrival within a year.
The numerical sequencing of all registry numbers is reset on January 1st of each succeeding year.
Airlines must pre-generate the registry numbers for all scheduled arrivals in the upcoming quarter and submit a copy to the Aircraft Operations Division (AOD) and Data Monitoring Division (DMD).
The Aircraft Operations Division (AOD) is responsible for generating registry numbers for airlines not listed in Annex "A," using the prefix code 'AOD'.
A proper notation or communication must be made to document the flight cancellation, but no modification to the pre-generated registry number should be made.
No, registry numbers are unique and must not be modified or adjusted by any office after generation.
All existing orders and issuances on coding or numbering schemes that are contradictory or inconsistent with this order are revoked, superseded, or amended accordingly.
The Order took effect on July 1, 1995, and remains in effect until revoked.