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AIM 

12/2/21 

testing NOTAMS are published and testing is actually 
occurring, ATC will advise pilots requesting or 
cleared for a GPS or RNAV (GPS) approach, that 
GPS may not be available and request the pilot’s 
intentions. TBL 5

1

1 lists an example of a GPS 

testing NOTAM. 

g.  NOTAM Classification. 

NOTAM information 

is classified as Domestic NOTAMs (NOTAM D), 
Flight Data Center (FDC) NOTAMs, International 
NOTAMs, or Military NOTAMs. 

1.  NOTAM (D)

 information is disseminated for 

all navigational facilities that are part of the National 
Airspace System (NAS), all public use aerodromes, 
seaplane bases, and heliports listed in the Chart 
Supplement. U.S. NOTAM (D) information includes 
taxiway closures, personnel and equipment near or 
crossing runways, and airport lighting aids that do not 
affect instrument approach criteria (i.e., VGSI). All 
NOTAM Ds must have one of the keywords listed in 
TBL 5

1

1, as the first part of the text after the 

location identifier. These keywords categorize 
NOTAM Ds by subject, for example, APRON 
(ramp), RWY (runway), SVC (Services), etc. There 
are several types of NOTAM Ds: 

(a) 

Aerodrome activity and conditions, to 

include field conditions. 

(b) 

Airspace to include CARF, SUA, and 

general airspace activity like UAS or pyrotechnics. 

(c) 

Visual and radio navigational aids. 

(d) 

Communication and services. 

(e) 

Pointer NOTAMs. NOTAMs issued to 

point to additional aeronautical information. When 
pointing to another NOTAM, the keyword in the 
pointer NOTAM must match the keyword in the 
original NOTAM. Pointer NOTAMs should be issued 
for, but are not limited to, TFRs, Airshows, 
Temporary SUA, major NAS system interruptions, 
etc. 

2. 

FDC NOTAMs are issued when it is 

necessary to disseminate regulatory information. 
FDC NOTAMs include: 

(a) 

Amendments to published IAPs and other 

current aeronautical charts. 

(b) 

Temporary Flight Restrictions (TFR) 

restrict entrance to a certain airspace at a certain time, 

however, some TFRs provide relief if ATC 
permission is given to enter the area when requested. 
Online preflight resources for TFRs provide graphics 
and plain language interpretations. 

(c) 

High barometric pressure warning. 

(d) 

Laser light activity. 

(e) 

ADS

B, TIS

B, and FIS

B service 

availability. 

(f) 

Satellite

based systems such as WAAS or 

GPS. 

(g) 

Special Notices. 

3. 

International NOTAMs are published in 

ICAO format per Annex 15 and distributed to 
multiple countries. 

(a) 

International NOTAMs issued by the U.S. 

NOTAM Office use Series A followed by 4 
sequential numbers, a slant “/” and a 2

digit number 

representing the year the NOTAM was issued. 
International NOTAMs basically duplicate data 
found in a U.S. Domestic NOTAM. 

(b) 

Not every topic of a U.S. Domestic 

NOTAM is issued as an International NOTAM by the 
U.S. The U.S. International NOTAM will be linked to 
the appropriate U.S. Domestic NOTAM when 
possible. 

(c) 

International NOTAMs received by the 

FAA from other countries are stored in the U.S. 
NOTAM System. 

(d) 

The International NOTAM format in-

cludes a “Q” Line that can be easily read/parsed by a 
computer and allows the NOTAM to be displayed 
digitally. 

(1) 

Field A:  ICAO location identifier or 

FIR affected by the NOTAM. 

(2) 

Field B: Start of Validity. 

(3) 

Field C: End of Validity (both in 

[Year][Month][Day][Hour][Minute] format). 

(4) 

Field D: (when present) Schedule. 

(5) 

Field E: Full NOTAM description. 

(6) 

Field F: (when present) Lowest altitude, 

or “SFC.” 

(7) 

Field G: (when present) Highest 

altitude, or “UNL.” 

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Preflight