NOTAM or
NoTAM is the quasi-acronym for a "Notice To Airmen". NOTAMs are created and transmitted by government agencies under guidelines specified by Annex 15: Aeronautical Information Services of the
Convention on International Civil AviationThe Convention on International Civil Aviation, also known as the Chicago Convention, established the International Civil Aviation Organization , a specialized agency of the United Nations charged with coordinating and regulating international air travel...
. A NOTAM is filed with an aviation authority to alert
aircraft pilotsAn aviator is a person who flies aircraft for pleasure or as a profession. The first recorded use of the term was in 1887 as a variation of the French 'aviation', from the latin 'avis', coined 1863 by G. de la Landelle in "Aviation ou Navigation Aérienne"...
of any hazards
en route or at a specific location. The authority in turn provides a means of disseminating relevant NOTAMs to pilots.
NOTAMs are issued (and reported) for a number of reasons, such as:
- hazards such as air-shows, parachute jumps, kite flying, rocket launches, etc.
- flights by important people such as heads of state (sometimes referred to as Temporary Flight Restrictions, TFRs)
- closed runways
- inoperable radio navigational aids
- military exercises with resulting airspace restrictions
- inoperable lights on tall obstructions
- temporary erection of obstacles near airfields (e.g.
NOTAM or
NoTAM is the quasi-acronym for a "Notice To Airmen". NOTAMs are created and transmitted by government agencies under guidelines specified by Annex 15: Aeronautical Information Services of the
Convention on International Civil AviationThe Convention on International Civil Aviation, also known as the Chicago Convention, established the International Civil Aviation Organization , a specialized agency of the United Nations charged with coordinating and regulating international air travel...
. A NOTAM is filed with an aviation authority to alert
aircraft pilotsAn aviator is a person who flies aircraft for pleasure or as a profession. The first recorded use of the term was in 1887 as a variation of the French 'aviation', from the latin 'avis', coined 1863 by G. de la Landelle in "Aviation ou Navigation Aérienne"...
of any hazards
en route or at a specific location. The authority in turn provides a means of disseminating relevant NOTAMs to pilots.
NOTAMs are issued (and reported) for a number of reasons, such as:
- hazards such as air-shows, parachute jumps, kite flying, rocket launches, etc.
- flights by important people such as heads of state (sometimes referred to as Temporary Flight Restrictions, TFRs)
- closed runways
- inoperable radio navigational aids
- military exercises with resulting airspace restrictions
- inoperable lights on tall obstructions
- temporary erection of obstacles near airfields (e.g. cranes)
- passage of flocks of birds through airspace (a NOTAM in this category is known as a BIRDTAM)
- notifications of runway/taxiway/apron status with respect to snow, ice and standing water (a SNOWTAM)
- notification of an operationally significant change in volcanic ash or other dust contamination (an ASHTAM)
- software code risk announcements with associated patches to reduce specific vulnerabilities
Aviation authorities typically exchange NOTAMs over
AFTNThe Aeronautical Fixed Telecommunication Network is a worldwide system of aeronautical fixed circuits provided, as part of the aeronautical fixed service, for the exchange of messages and/or digital data between aeronautical fixed stations having the same or compatible communications characteristics...
circuits.
Software is available to allow pilots to identify NOTAMs near their intended route or at the intended destination.
When computer systems for the air force are updated the software updates are usually referred to as NOTAMs
Format
The following describes ICAO NOTAMs, which may be different from US Domestic NOTAMs. Additionally, NOTAMs are poorly controlled and not all NOTAMs are issued using the required standards:
The first line contains NOTAM identification (series, sequence number and year of issue), the type of operation (NEW, REPLACE, CANCEL), as well as a reference to a previously-issued NOTAM (for NOTAMR and NOTAMC only).
The 'Q' line holds (basic-remove) information about who the NOTAM affects along with a basic NOTAM description. This line can be encoded/decoded from tables defined by ICAO.
The 'A' line is the ICAO code of the affected aerodrome or
FIRA Flight Information Region is an aviation term used to describe airspace with specific dimensions, in which a Flight Information Service and an alerting service are provided. It is the largest regular division of airspace in use in the world today....
for the NOTAM. The area of influence of the NOTAM can be several hundreds of kilometres away from the originating aerodrome.
The 'B' line contains the start time and date, the 'C' line the finish time and date of the NOTAM. The date is in a USA date format of YY/MM/DD and the times are given in Universal Co-ordinated Time; also known as GMT or Zulu time.
Sometimes a 'D' line may be present. This gives a miscellaneous
diurnalA day is a unit of time equivalent to approximately 24 hours. It is not an SI unit but it is accepted for use with SI. The SI unit of time is the second....
time for the NOTAM if the hours of effect are less than 24 hours a day.
E.g.
parachuteA parachute is a device used to slow the motion of an object through an atmosphere by creating drag. Parachutes are made out of cloth, most commonly nylon....
dropping exercises tend to occur for short periods of a few hours during the day, but may be repeated over many days.
The 'E' line is the full NOTAM description. It is in English but heavily abbreviated. These abbreviations can be encoded/decoded by tables defined by ICAO.
When present, 'F' and 'G' lines detail the height restrictions of the NOTAM. Typically SFC means surface height or ground level and UNL is unlimited height. Other heights are given in feet or
flight levelA Flight Level is a standard nominal altitude of an aircraft, in hundreds of feet. This altitude is calculated from a world-wide fixed pressure datum of 1013.25 hPa , the average sea-level pressure, and therefore is not necessarily the same as the aircraft's true altitude either above mean...
or a combination of the two.
Example
This is a typical NOTAM for
London[]London is the capital of England and the United Kingdom. It has been a major settlement for two millennia, and the history of London goes back to its founding by the Romans, when it was named Londinium. London's core, the ancient City of London, the 'square mile', retains its medieval boundaries...
Heathrow airport:
A1234/06 NOTAMR A1212/06
Q)EGTT/QMXLC/IV/NBO/A/000/999/5129N00028W005
A)EGLL
B)0609050500
C)0704300500
E)DUE WIP TWY B SOUTH CLSD BTN 'F' AND 'R'. TWY 'R' CLSD BTN 'A' AND 'B' AND DIVERTED VIA NEW GREEN CL AND BLUE EDGE LGT. ADZ CTN
This decodes into the following:
SERIES and NUMBER : A1234 issued in 2006
NATURE OF THE NOTAM : Replacing NOTAM 1212 issued in 2006
FIR: EGTT (LONDON FIR)
SUBJECT: Taxiway (MX)
CONDITION: Closed (LC)
TRAFFIC: NOTAM issued for
IFRInstrument flight rules are regulations and procedures for flying aircraft by referring only to the aircraft instrument panel for navigation. Even if nothing can be seen outside the cockpit windows, an IFR-rated pilot can fly while looking only at the instrument panel...
(I) flights and
VFRVisual flight rules are a set of regulations which allow a pilot to operate an aircraft in weather conditions generally clear enough to allow the pilot to see where the aircraft is going. Specifically, the weather must be better than Basic VFR Weather Minimums, as specified in the rules of the...
flights (V)
PURPOSE: NOTAM selected for immediate attention of aircraft operators (N)
PURPOSE: NOTAM selected for PIB entry (B)
PURPOSE: NOTAM Concerning Flight operations (O)
SCOPE: Aerodrome
GEOGRAPHICAL LOCATION : 51°29' N 000° 28' W
OPERATIONAL RADIUS OF THE NOTAM : 5 NM
AERODROME : London Heathrow (EGLL)
FROM: 05:00 UTC 5 September 2006
UNTIL:05:00 UTC 30 April 2007
CATEGORY: Aerodromes, Air Routes and Ground Aids
DESCRIPTION: DUE WORK IN PROGRESS TAXIWAY B SOUTH CLOSED BETWEEN 'F' AND 'R'. TAXIWAY 'R' CLOSED BETWEEN 'A' AND 'B' AND DIVERTED VIA NEW GREEN CENTRE LINE AND BLUE EDGE LIGHT(ING). ADVISE CAUTION
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