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AIM

10/12/17

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