AIM

8/15/19

4

−

5

−

18

Surveillance Systems

3.

Aircraft with an Inoperative/Malfunctioning

ADS

−

B Transmitter:

(a)

ATC will inform the flight crew when the

aircraft’s ADS

−

B transmitter appears to be inopera-

tive or malfunctioning:

PHRASEOLOGY

−

YOUR ADS

−

B TRANSMITTER APPEARS TO BE

INOPERATIVE/MALFUNCTIONING. STOP ADS

−

B

TRANSMISSIONS.

(b)

ATC will inform the flight crew if it

becomes necessary to turn off the aircraft’s ADS

−

B

transmitter.

PHRASEOLOGY

−

STOP ADS

−

B TRANSMISSIONS.

(c)

Other malfunctions and considerations:

Loss of automatic altitude reporting capabilities
(encoder failure) will result in loss of ATC altitude
advisory services.

e. ADS

−

B Limitations.

1.

The ADS

−

B cockpit display of traffic is NOT

intended to be used as a collision avoidance system
and does not relieve the pilot’s responsibility to “see
and avoid” other aircraft. (See paragraph 5

−

5

−

8, See

and Avoid). ADS

−

B must not be used for avoidance

maneuvers during IMC or other times when there is
no visual contact with the intruder aircraft. ADS

−

B is

intended only to assist in visual acquisition of other
aircraft. No avoidance maneuvers are provided nor
authorized, as a direct result of an ADS

−

B target

being displayed in the cockpit.

2.

Use of ADS

−

B radar services is limited to the

service volume of the GBT.

NOTE

−

The coverage volume of GBTs are limited to line

−

of

−

sight.

f. Reports of ADS

−

B Malfunctions.

Users of ADS

−

B can provide valuable assistance in

the correction of malfunctions by reporting instances
of undesirable system performance. Since ADS-B
performance is monitored by maintenance personnel
rather than ATC, report malfunctions to the nearest
Flight Service Station (FSS) facility by radio or
telephone. Reporters should identify:

1.

Condition observed.

2.

Date and time of observation.

3.

Altitude and location of observation.

4.

Type and call sign of the aircraft.

5.

Type and software version of avionics

system.

4

−

5

−

8. Traffic Information Service

−

Broadcast (TIS

−

B)

a. Introduction

TIS

−

B is the broadcast of ATC derived traffic

information to ADS

−

B equipped (1090ES or UAT)

aircraft from ground radio stations. The source of this
traffic information is derived from ground

−

based air

traffic surveillance sensors. TIS

−

B service will be

available throughout the NAS where there are both
adequate surveillance coverage from ground sensors
and adequate broadcast coverage from ADS

−

B

ground radio stations. The quality level of traffic
information provided by TIS

−

B is dependent upon

the number and type of ground sensors available as
TIS

−

B sources and the timeliness of the reported

data. (See FIG 4

−

5

−

8 and FIG 4

−

5

−

9.)

b. TIS

−

B Requirements.

In order to receive TIS

−

B service, the following

conditions must exist:

1.

Aircraft must be equipped with an ADS

−

B

transmitter/receiver or transceiver, and a cockpit
display of traffic information (CDTI).

2.

Aircraft must fly within the coverage volume

of a compatible ground radio station that is
configured for TIS

−

B uplinks. (Not all ground radio

stations provide TIS

−

B due to a lack of radar

coverage or because a radar feed is not available).

3.

Aircraft must be within the coverage of and

detected by at least one ATC radar serving the ground
radio station in use.

c. TIS

−

B Capabilities.

1.

TIS

−

B is intended to provide ADS

−

B

equipped aircraft with a more complete traffic picture
in situations where not all nearby aircraft are
equipped with ADS

−

B Out. This advisory

−

only

application is intended to enhance a pilot’s visual
acquisition of other traffic.

2.

Only transponder

−

equipped targets

(i.e., Mode A/C or Mode S transponders) are
transmitted through the ATC ground system
architecture. Current radar siting may result in
limited radar surveillance coverage at lower