755 

Federal Aviation Administration, DOT 

§ 91.227 

(for example, latitude, longitude, and 
velocity) information. 

Source Integrity Level (SIL) 

indicates 

the probability of the reported hori-
zontal position exceeding the contain-
ment radius defined by the NIC on a 
per sample or per hour basis, as defined 
in TSO–C166b and TSO–C154c. 

System Design Assurance (SDA) 

indi-

cates the probability of an aircraft 
malfunction causing false or mis-
leading information to be transmitted, 
as defined in TSO–C166b and TSO– 
C154c. 

Total latency 

is the total time be-

tween when the position is measured 
and when the position is transmitted 
by the aircraft. 

Uncompensated latency 

is the time for 

which the aircraft does not compensate 
for latency. 

(b) 

1090 MHz ES and UAT Broadcast 

Links and Power Requirements

— 

(1) Aircraft operating in Class A air-

space must have equipment installed 
that meets the antenna and power out-
put requirements of Class A1, A1S, A2, 
A3, B1S, or B1 equipment as defined in 
TSO–C166b, Extended Squitter Auto-
matic Dependent Surveillance-Broad-
cast (ADS–B) and Traffic Information 
Service-Broadcast (TIS–B) Equipment 
Operating on the Radio Frequency of 
1090 Megahertz (MHz). 

(2) Aircraft operating in airspace des-

ignated for ADS–B Out, but outside of 
Class A airspace, must have equipment 
installed that meets the antenna and 
output power requirements of either: 

(i) Class A1, A1S, A2, A3, B1S, or B1 

as defined in TSO–C166b; or 

(ii) Class A1H, A1S, A2, A3, B1S, or B1 

equipment as defined in TSO–C154c, 
Universal Access Transceiver (UAT) 
Automatic Dependent Surveillance– 
Broadcast (ADS–B) Equipment Oper-
ating on the Frequency of 978 MHz. 

(c) 

ADS–B Out Performance Require-

ments for NAC 

P,

NAC

V

, NIC, SDA

, 

and 

SIL

— 

(1) For aircraft broadcasting ADS–B 

Out as required under § 91.225 (a) and 
(b)— 

(i) The aircraft’s NAC

P

must be less 

than 0.05 nautical miles; 

(ii) The aircraft’s NAC

V

must be less 

than 10 meters per second; 

(iii) The aircraft’s NIC must be less 

than 0.2 nautical miles; 

(iv) The aircraft’s SDA must be 2; 

and 

(v) The aircraft’s SIL must be 3. 
(2) Changes in NAC

P

, NAC

V

, SDA, and 

SIL must be broadcast within 10 sec-
onds. 

(3) Changes in NIC must be broadcast 

within 12 seconds. 

(d) 

Minimum Broadcast Message Ele-

ment Set for ADS–B Out. 

Each aircraft 

must broadcast the following informa-
tion, as defined in TSO–C166b or TSO– 
C154c. The pilot must enter informa-
tion for message elements listed in 
paragraphs (d)(7) through (d)(10) of this 
section during the appropriate phase of 
flight. 

(1) The length and width of the air-

craft; 

(2) An indication of the aircraft’s 

latitude and longitude; 

(3) An indication of the aircraft’s bar-

ometric pressure altitude; 

(4) An indication of the aircraft’s ve-

locity; 

(5) An indication if TCAS II or ACAS 

is installed and operating in a mode 
that can generate resolution advisory 
alerts; 

(6) If an operable TCAS II or ACAS is 

installed, an indication if a resolution 
advisory is in effect; 

(7) An indication of the Mode 3/A 

transponder code specified by ATC; 

(8) An indication of the aircraft’s call 

sign that is submitted on the flight 
plan, or the aircraft’s registration 
number, except when the pilot has not 
filed a flight plan, has not requested 
ATC services, and is using a TSO–C154c 
self-assigned temporary 24-bit address; 

(9) An indication if the flightcrew has 

identified an emergency, radio commu-
nication failure, or unlawful inter-
ference; 

(10) An indication of the aircraft’s 

‘‘IDENT’’ to ATC; 

(11) An indication of the aircraft as-

signed ICAO 24-bit address, except 
when the pilot has not filed a flight 
plan, has not requested ATC services, 
and is using a TSO–C154c self-assigned 
temporary 24-bit address; 

(12) An indication of the aircraft’s 

emitter category; 

(13) An indication of whether an 

ADS–B In capability is installed; 

(14) An indication of the aircraft’s 

geometric altitude; 

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