This lesson is about the keeper of the facts. It opens with what an aeronautical information service is for, arms you with the definitions the exam quotes, sets out the service's duties and opening hours, and then spends its second half inside the AIP: what the publication is, how its three parts are organised, where the specific facts the syllabus names are filed, and how the AIP is kept honest through amendments and supplements.
What the AIS is for
The objective of an aeronautical information service is to ensure the flow of aeronautical data and aeronautical information necessary for the safety, regularity and efficiency of air navigation. The current edition of Annex 15 frames that flow as serving the global air traffic management system's safety, regularity, economy and efficiency, in an environmentally sustainable manner. The word to hold onto is flow: the service does not merely hold information, it moves it, from the originators who create it, through quality-assured processing, to every crew and unit that needs it, in time to be used. Each Contracting State must provide an AIS, agree with other States on a joint service, or delegate the job to a non-governmental agency that meets the Annex — and the State remains responsible for the data and information provided for its territory and for the high-seas areas where it provides air traffic services.
The vocabulary of Annex 15
The exam quotes these definitions nearly verbatim, and several deliberately contrast with each other. The publication family first:
Aeronautical Information Publication (AIP) — a publication issued by or with the authority of a State, containing aeronautical information of a lasting character essential to air navigation.
AIP Amendment — permanent changes to the information contained in the AIP.
AIP Supplement — temporary changes to the information in the AIP, published by means of special pages.
NOTAM — a notice distributed by means of telecommunication, containing information concerning the establishment, condition or change in any aeronautical facility, service, procedure or hazard, the timely knowledge of which is essential to personnel concerned with flight operations.
SNOWTAM — a special series NOTAM given in a standard format, providing a surface condition report notifying the presence or cessation of hazardous conditions due to snow, ice, slush, frost, standing water or water associated with snow, slush, ice or frost on the movement area.
ASHTAM — a special series NOTAM notifying, in a specific format, a change in the activity of a volcano, a volcanic eruption and/or a volcanic ash cloud of significance to aircraft operations.
Aeronautical Information Circular (AIC) — a notice containing information that does not qualify for the origination of a NOTAM or for inclusion in the AIP, but which relates to flight safety, air navigation, technical, administrative or legislative matters.
Pre-flight information bulletin (PIB) — a presentation of current NOTAM information of operational significance, prepared prior to flight.
Then the system and its offices:
AIRAC — an acronym (aeronautical information regulation and control) signifying a system aimed at advance notification, based on common effective dates, of circumstances that necessitate significant changes in operating practices.
Aeronautical information management (AIM) — the dynamic, integrated management of aeronautical information through the provision and exchange of quality-assured digital aeronautical data, in collaboration with all parties.
International NOTAM office (NOF) — an office designated by a State for the exchange of NOTAM internationally.
International airport — any airport designated by the Contracting State in whose territory it is situated as an airport of entry and departure for international air traffic, where the formalities of customs, immigration, public health, animal and plant quarantine and similar procedures are carried out.
The remaining five definitions are old friends from earlier in the course, restated because this learning objective redeclares them:
Manoeuvring area — the part of an aerodrome used for take-off, landing and taxiing, excluding aprons.
Movement area — the manoeuvring area plus the aprons.
Prohibited area — airspace of defined dimensions over a State's land or territorial waters within which flight is prohibited.
Restricted area — the same, but with flight restricted in accordance with specified conditions.
Danger area — airspace of defined dimensions within which activities dangerous to flight may exist at specified times, with no territorial limitation in the definition.
Duties and opening hours
The service's hours are a tested clause: where an AIS is not available on a 24-hour basis, it shall be available during the whole period an aircraft is in flight in its area of responsibility, plus at least two hours before and after that period, and at such other times as an appropriate ground organisation may request. A briefing office that closes while one of its aircraft is still airborne has abandoned it.
What the service owes its users: aeronautical data and information necessary for the safety, regularity or efficiency of air navigation, made available in a form suitable for the operational requirements of the ATM community, expressly including those involved in flight operations (flight crews, flight planning and flight simulators), and the ATS unit responsible for flight information service and the services responsible for pre-flight information. For its own State, the duty is the whole production line. An AIS shall receive, collate or assemble, edit, format, publish/store and distribute aeronautical data and information, concerning the entire territory of the State and the high-seas areas in which it provides air traffic services. The products it provides form one family: the AIP with its amendments and supplements, the AIC, aeronautical charts, NOTAM with their checklists and the pre-flight information bulletins built from them — and, in the current data-centric regime, the digital data sets that feed navigation databases directly.
The AIP
The AIP is the basic aviation document of a State: its primary purpose is to satisfy the international requirements for the exchange of permanent aeronautical information, and long-duration temporary changes, essential to air navigation. Its housekeeping rules are examinable in their own right: each AIP is self-contained with a table of contents, must not duplicate information within itself or from other sources, is dated (every page, in the usual loose-leaf form, with day, month by name and year) and travels with a frequently reissued checklist of pages so the user can keep it current. Changes are marked with a distinctive symbol or annotation, amendments arrive as replacement sheets (hand amendments kept to the minimum), and operationally significant changes are published under AIRAC procedures and clearly identified by the acronym AIRAC.
The publication has three parts:
GEN (General) — the national regulations, tables, codes and service descriptions.
ENR (En-route) — the rules, airspace, routes and warnings of the en-route phase.
AD (Aerodromes) — everything about the aerodromes themselves.
Knowing which part holds which fact is a learning objective the exam mines heavily, so the map below follows the syllabus's own list.