Aeronautical Information Manual (AIM), page 259

Index   258 -- Page 259 -- 260

2. An aircraft's Flight Identification (FLT ID),
also known as registration number or airline flight
number, is transmitted by the ADS-B Out avionics.
The FLT ID is comprised of a maximum of seven

alphanumeric characters and also corresponds to the
aircraft identification annotated on the ATC flight
plan. The FLT ID for airline and commuter aircraft is
associated with the company name and flight number
(for example, AAL3342). The FLT ID is typically
entered by the flightcrew during preflight through
either a Flight Management System (FMS) interface
(Control Display Unit/CDU) or transponder control

panel. The FLT ID for General Aviation (GA) aircraft
is associated with the aircraft's registration number.
The aircraft owner can preset the FLT ID to the
aircraft's registration number (for example,
N235RA), since it is a fixed value, or the pilot can
enter it into the ADS-B Out system prior to flight.

ATC systems use transmitted FLT IDs to uniquely
identify each aircraft within a given airspace and

correlate them to a filed flight plan for the provision

of surveillance and separation services. If the FLT ID
is not entered correctly, ATC automation systems
may not associate surveillance tracks for the aircraft
to its filed flight plan. Therefore, Air Traffic services
may be delayed or unavailable until this is corrected.
Consequently, it is imperative that flightcrews and
GA pilots ensure the FLT ID entry correctly matches
the aircraft identification annotated in the filed ATC
flight plan.
3. ADS-B systems integrated with the
transponder will automatically set the applicable
emergency status when 7500, 7600, or 7700 are

entered into the transponder. ADS B systems not
integrated with the transponder, or systems with
optional emergency codes, will require that the
appropriate emergency code is entered through a pilot
interface. ADS-B is intended for in-flight and
airport surface use. ADS-B systems should be
turned "on" -- and remain "on" -- whenever
operating in the air and moving on the airport
surface. Civil and military Mode A/C transpon-
ders and ADS-B systems should be adjusted to the
"on" or normal operating position as soon as
practical, unless the change to "standby" has been

accomplished previously at the request of ATC.

d. ATC Surveillance Services using ADS-B -
Procedures and Recommended Phraseology -
For Use In Alaska Only

Radar procedures, with the exceptions found in this
paragraph, are identical to those procedures pre-
scribed for radar in AIM Chapter 4 and Chapter 5.

1. Preflight:

If a request for ATC services is predicated on ADS-B
and such services are anticipated when either a VFR
or IFR flight plan is filed, the aircraft's "N" number
or call-sign as filed in "Block 2" of the Flight Plan
must be entered in the ADS-B avionics as the
aircraft's flight ID.

2. Inflight:

When requesting ADS-B services while airborne,
pilots should ensure that their ADS-B equipment is
transmitting their aircraft's "N" number or call sign
prior to contacting ATC. To accomplish this, the pilot
must select the ADS-B "broadcast flight ID"

The broadcast "VFR" or "Standby" mode built into some

ADS-B systems will not provide ATC with the appropriate
aircraft identification information. This function should
first be disabled before contacting ATC.

3. Aircraft with an Inoperative/Malfunctioning
ADS-B Transmitter or in the Event of an Inoperative
Ground Broadcast Transceiver (GBT).
(a) ATC will inform the flight crew when the
aircraft's ADS-B transmitter appears to be inopera-
tive or malfunctioning:

(b) ATC will inform the flight crew when the
GBT transceiver becomes inoperative or malfunc-
tioning, as follows:
(And if appropriate) RADAR CONTACT LOST.
An inoperative or malfunctioning GBT may also cause a
loss of ATC surveillance services.

(c) ATC will inform the flight crew if it

becomes necessary to turn off the aircraft's ADS-B

Surveillance Systems 4-5-17

Page 259 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   258 -- Page 259 -- 260