FANS

Question 1

FANS

Answer 1

future air navigation systems

text based messaging and data link comms

Question 2

Why is FANS needed?

Answer 2

issues with radio comms:
poor radio signal
misinterpreting comms
congestion

Question 3

by using FANS

Answer 3

improves ATC efficiency

allows more aircraft to safely use the same airspace

Question 4

what does FANS need?

Answer 4

a global aeronautical telecommunications network (ATN)

Question 5

two versions of FANS

Answer 5

older- uses existing infrastructure in a new way

newer- custom built for this specific network

Question 6

FANS services provided by

Answer 6

SITA

ARINIC

Question 7

satellites operated by

Answer 7

INMARSAT

Question 8

FANS a/c components: ATSU

Answer 8

air traffic service unit 
- comms management (CMU)
FMS 
CDU
printer 
maintenance coms 
ATC visual annunciator

Question 9

downlink

Answer 9

data sent from aircraft to ground

Question 10

uplink

Answer 10

data sent from ground to aircraft

Question 11

ACARS

Answer 11

aircraft communication addressing & reporting system
allows txt based comms with operator
limited interaction with ATC
certain automatic transmissions
all accessed via CDU
D-ATIS- digital ATIS
txt msg- to operator
Wx request - METAR & TAF
DCL- digital clearance- departure & oceanic
OOOI msg- records out, off, on , in times

Question 12

CPDLC

Answer 12

controller pilot datalink communication
accessed via CDU or a dedicated panel
allows for txt messaging between pilot and ATC
free text or formatted message (pre set message pilot or ATC fill in)

Question 13

possible messages

Answer 13

FL changes 
route changes 
voice contact request 
oceanic clearances
constraints
ATC transfer request

Question 14

not allowed in a message

Answer 14

T/O clearance
landing clearance
taxi clearance

Question 15

FANS log on

Answer 15

before using system must log on
enter certain details like flight number and aircraft reg
aircraft capabilities entered- may not be able to fully utilise all functions

Question 16

ADS

Answer 16

automatic dependant surveillance

aircraft broadcasts info about itself automatically

Question 17

ADS-B

Answer 17

ads broadcast

periodically broadcasts position

Question 18

ADS-C

Answer 18

ADS contract

specific contract is made between the aircraft and a ground station chosen by ATC

Question 19

Types of ADS-C contracts

Answer 19

periodic- certain parameters sent at defined intervals
event- information sent when certain conditions are met (passing a waypoint)
on demand- one-off request for specific information
emergency: only contract selected by the pilot, increases the reporting rate

Question 20

route FANS requirements

Answer 20

some routes are FANS only routes