Home' RTCA Documents for Review : DO-201B User Requirements for Navigation Data Contents ED-77A/DO-201BforOpenConsultation/FRAC
© EUROCAE, 2018
Major changes are generally coordinated with other States (in the region) with the aim
of avoiding similar amounts of changes in other countries in the region at the same
Note: FMS databases, even the latest produced models, may have data storage
constraints. A potential effect of multiple very large changes might lead to even more
constraints regarding the storage capacity of onboard databases up to situations were
a navigation databases on board the aircraft might not be able to contain all (new)
information in a specific geographical area. In such cases, the total size of affected
databases needs to be cut to a maximum size corresponding to the capacity of the
airborne database system. Such cuts will lead to situations where not all information is
contained in such a database and hence, it may limit the flexibility of the airspace user
to accept certain instructions by ATC.
ELECTRONIC AIP (E-AIP)
The same AIRAC principles apply if an AIP is made available electronically. This
includes that once published; information is not to be changed again – even if an
electronic distribution cuts the mailing time significantly. It is also recommended to
issue a NOTAM announcing potential changes on the electronic AIP. Such notification
is intended to inform the users that changes are going to take place.
If both an e-AIP and a printed AIP are distributed it is expected by the user community
that both version match and are congruent with each other. However, it is recognized
that this congruence may not occur in all cases and for that reason; it is recommended
that an announcement be made as to which of the two versions is the controlling
General Considerations for NOTAMs
The “Notice to Airmen” (NOTAM) has been an integral part of the system for
disseminating critical aeronautical information worldwide for a very long time.
Typically, NOTAMs publicize aeronautical information that is time critical as well as
temporary in nature. NOTAMs are also used when the information is not known
sufficiently in advance to allow for timely inclusion of regular AIP amendments or
supplements in the regular AIRAC publication cycle. Extensive text or the inclusion of
graphics are not suitable for NOTAMs and can be included in regular amendments or
NOTAMs communicate aeronautical information that has a direct impact on a pilot’s
flight preparation. It is for this reason that all pilots are required by regulation to review
all available NOTAMs applicable to their particular flight.
Dependencies for NOTAM Inclusion into Charts and Navigational Databases
A NOTAM is (only) issued whenever the information to be distributed is of a temporary
nature and of short duration, or changes occurred short-notice. However, if a NOTAM
is needed to convey the information it is originated and disseminated promptly.
As charts and database production are subject to a regular, repetitive creation
schedule, information that has been promulgated via NOTAM will most likely not be
immediately contained in all navigation products and services. Furthermore, it is very
likely that such information may be applied inconsistently (from a timing perspective)
as production schedules for the various navigation products and services do vary.
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