At any given time, there are 75 ‘in-sequence’ registration marks available for new registrations. If you would like
to choose from among these, enter ‘please telephone’ at question 4 on the CA1 Application for Register of Aircraft
form; otherwise, you will be assigned the next available mark.
you are not yet in a position to register an aircraft (see How
to Register an Aircraft ) it is possible to reserve out-of-sequence marks
in your name for future use for a period of six months. At the end of the six
months period the reservation can be renewed if necessary.
Please note that the reservation fee is not deductible from the registration fee once the aircraft itself is
registered using the previously reserved marks.
You can search for a registration mark on
G-INFO, the UK Register database to see if it has already been assigned to an aircraft.
If a mark does not appear on the database it is generally available, but some combinations of letters are not used
at all and some marks may be reserved for future use. These non-available marks do not appear on the database but
neither are they available for allocation.
After checking the database it is advisable to contact the Aircraft Registration section direct with your requests
In accordance with ICAO Annex 7, combinations of letters
which would cause confusion with distress signals or other urgent signals are
not used in registration marks. Examples of marks that cannot be used in either
the first three letters or the last three letters of a registration mark are
PAN, SOS, TTT and XXX. Any other identified distress signals are also blocked
from allocation. Also, to avoid confusion with the three letter combinations
beginning with Q used in the “Q Code” system, no marks will be issued which
contain the letter Q.
To avoid problems if registration marks are used in
telegraphic transmissions the letters ZC are not issued in any part of the
Combinations which may be considered offensive may be
excluded at the Aircraft Registration Section’s discretion.
Any UK registration marks that are currently in use or have been registered in the past are not re-issued to a
second aircraft to avoid any confusion. An individual airframe may have more than one registration mark in its
lifetime, but a particular registration mark can only apply to one airframe.
Therefore, there are no historical registration marks available for issue (i.e. between G-AAAA and the current
in-sequence range) unless it is the original aircraft that is being re-registered or restored to the UK Register.
Generally an original aircraft can return to any of the UK registration marks that it has previously carried.
By default, a glider’s three-letter BGA trigraph will be used as the last three letters of its UK registration
For example, if the BGA trigraph is PXL the aircraft will be allocated the next available UK registration mark that
contains PXL as the last three letters, so if G-CPXL is not available the aircraft will be allocated G-DPXL and so on.
Out of sequence registration marks (see above) can also be used on gliders in place of trigraph related marks.
There are no longer separate blocks of marks issued to microlights or small light aircraft. These aircraft are now
entered in the main in-sequence blocks or given out-of-sequence marks if requested.
However, minimum lift balloons are confined to the G-FYAA-ZZ blocks.
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