RNZAF Serial Numbers Explained
A Defence Force Order (Air Force) was issued in 1992, which formalised the policy for allocation of RNZAF aircraft serial numbers. It also introduced a change to instructional airframe numbering.
The policy for airworthy aircraft serial numbers rests heavily on historical precedent. The main features are as follows:
All serial numbers comprise "NZ" plus four figures and block reservations are:
NZ1xxx Primary trainers, utility types
NZ2xxx Flying training other than pilot.
NZ3xxx Rotary wing aircraft.
NZ4xxx Maritime aircraft.
NZ6xxx Strike aircraft.
NZ7xxx Transport aircraft.
Unallocated blocks are reserved for either new roles or for overflows when any of the above blocks become over subscribed.
The first 2 figures in combination comprise a "type number", which is unique to that type during its period of service. Type number combinations may be re-used provided the type is not the "replacement" aircraft type, and provided at least one year has passed since withdrawal of the previous type that used that type number.
The last 2 figures, the tail number, must form a unique combination with the type number. This means that historically, the same serial number must not be allocated more than once. Source:
ADF Serials