relating to communication signals and operating signals
The purpose of this publication is to list operating signals and provide instructions for their
This publication includes:
a. Operating Signals from the following series of international civil Q code:
(1) The series QAA to QNZ inclusive, the meanings of which are assigned by the
International Civil Aviation Organization (ICAO). In general, the only civil stations that will have
available a copy of this series are those of the Aeronautical Service. Therefore, this series is not to
be used with other civil stations unless it is known that the station concerned is familiar with the
series. (Note: Stations of the Aeronautical Service are those operated in accordance with ICAO
international standards and recommended practices to provide for the safety of air navigation and
for the regular, efficient and economical operation of the air services).
(2) The series QOA to QQZ inclusive is reserved for the Maritime Services.
(3) The series QRA to QUZ inclusive, the meanings of which are assigned by the
International Telecommunications Union (ITU). In general, all civil stations will have available a
copy of this series. Therefore, this series may be used with all civil stations unless the station
concerned indicates its unfamiliarity with the series.
(4) The series QVA to QZZ inclusive has not been allocated to date.
b. Operating signals from the series ZAA to ZXZ inclusive of the allied military Z code.
The series ZYA to ZZZ inclusive is reserved for the temporary or permanent assignment of
meanings on an intra-military basis by any nation, service or command authorized use of this
publication. For the convenience of assigning authorities, provision for this series (ZYA-ZZZ) is
included in Chapter 5 of this publication.
c. Miscellaneous abbreviations and symbols developed or approved by ICAO for use with
the series QAA to QNZ inclusive. These abbreviations and symbols, however, are authorized for
use by allied military stations with any Q or Z signal subject to the use limitations, if any, of that Q
or Z signal (see paragraph 103).