Categories Of Message

Question 1

Comprises those messages sent by mobile stations reporting that they are threatened by grave and imminent danger and other messages relative to the immediate assistance required by the mobile station in distress

Answer 1

1. Distress Messages (SS)

Question 2

Comprises those messages concerning the safety of a ship, aircraft or other vehicles, or of some person on board or within sight

Answer 2

2. Urgency Messages (DD)

Question 3

a. movement and control messages
b. messages originated by aircraft operating agency of immediate concern to aircraft in flight or preparing to depart
c. meteorological messages restricted to SIGMET information, special air reports, AIRMET messages, volcanic ash and tropical cyclone advisory information and amended forecast

Answer 3

3. Flight Safety Messages (FF)

Question 4

a. terminal aerodrome forecasts (TAF), area and route forecasts.
b. weather observations and reports like METAR and SPECI

Answer 4

4. Meteorological Messages (GG)

Question 5

a. aircraft load messages required for weight and balance computation
b. changes in aircraft operating schedules.
c. concerning aircraft servicing
d. concerning changes in collective requirements for passengers, crew and cargo covered by deviation from normal operating schedules
e. concerning non-routine landing;
f. concerning pre-flight arrangements for air navigation services and operational servicing for non-scheduled aircraft operations (overflight clearance request);
g. originated by aircraft operating agencies reporting an aircraft arrival or departure.
h. Concerning parts and materials urgently required for the operation of aircraft

Answer 5

5. Flight Regularity Messages (GG)

Question 6

a. concerning NOTAM;
b. concerning SNOWTAM

Answer 6

6. Aeronautical Information Service Messages (GG)

Question 7

a. regarding the operation or maintenance of facilities provided for the safety or regularity of aircraft operations; b. concerning the functioning of aeronautical telecommunication services;
c. exchanged between civil aeronautical authorities relating to aeronautical services

Answer 7

7. Aeronautical Administrative Messages (KK)

Question 8

Originated by aeronautical fixed stations to obtain information or verification concerning other messages which appear to have been transmitted incorrectly by the aeronautical fixed service, confirming channel sequence number, etc

Answer 8

8. Service Messages (priority indicator as appropriate)

Question 9

1. Distress messages and traffic including messages relating to distress phase (SS)
2. Urgency messages including messages relating to alert phase or uncertainty phase (DD)
3. Other messages concerning known or suspected emergencies which do not fall under 1) or 2) and radio communication failure messages (FF or higher as required)

Answer 9

Emergency Messages

Question 10

• filed flight plan messages (FPL)
• delay messages (DLA)
• modification messages (CHG)
• FPL cancellation messages (CNL)
• departure messages (DEP)
• arrival messages (ARR)

Answer 10

Movement messages (FF)

Question 11

• current flight plan messages (CPL);
• estimate messages (EST);
• coordination messages (CDN);
• acceptance messages (ACP)

Answer 11

Coordination messages (FF)

Question 12

• request flight plan messages (RQP)
• request supplementary flight plan messages (RQS);
• supplementary flight plan messages (SPL)

Answer 12

Supplementary messages (FF)

Question 13

• notification messages
• coordination messages
• transfer of control messages
• general information messages

Answer 13

ATS Inter-facility data communication (AIDC)
messages

Question 14

1. Messages containing traffic information (FF);
2. Messages containing meteorological
   information (FF or GG);
3. Messages concerning the operation of
   aeronautical facilities (GG);
4. Messages containing essential aerodrome
   information (GG);
5. Messages concerning air traffic incident
   reports (FF)

Answer 14

Flight Information Messages

Question 15

1. Movement messages (FF)
2. Coordination messages (FF)
3. Supplementary messages (FF)
4. ATS Inter-facility data communication (AIDC) messages

Answer 15

Movement and Control messages