Minimum Aviation System Performance Standards for Aircraft ...

MS
Elem.
#
Table 3.5.1.4: Mode Status (MS) Report Definition.
Elements That Require Rapid Update
Contents [Resolution or # of bits]
Reference
Section
ID
1
2
Participant Address
Address Qualifier
[24 bits]
[1 bit]
3.3.2.2.1
3.3.2.2.2 1
TOA 3 Time of Applicability [1 s resolution] 3.5.1.4.2
© 20xx, RTCA, Inc.
Notes
Version 4 ADS-B Version Number [3 bits] 3.5.1.4.3
ID,
Continued
5a
5b
5c
Call Sign [up to 8 alpha-numeric characters]
Emitter Category [5 bits]
A/V Length and Width Codes [4 bits]
3.5.1.4.4
3.5.1.4.5
3.5.1.4.6 2
Status
6a
6b
Mode Status Data Available
Emergency/Priority Status
[1 bit]
[3 bits]
3.5.1.4.7
3.5.1.4.8 3
Capability Class Codes [16 bits] 3.5.1.4.9
7a: TCAS/ACAS operational [1 bit] • 3.5.1.4.9 4
CC,
Capability
Codes
7
7b: 1090 MHz ES Receive Capability
7c: ARV report Capability Flag
7d: TS report Capability Flag
7e: TC report Capability Level
[1 bit]
[1 bit]
[1 bit]
[2 bits]
3.5.1.4.9
3.5.1.4.9
3.5.1.4.9
3.5.1.4.9
7f: UAT Receive Capability [1 bit] 3.5.1.4.9
(CC Codes reserved for future growth) [3 bits] 3.5.1.4.9
Operational Mode Parameters [16 bits] 3.5.1.4.10
8a: TCAS/ACAS resolution advisory active [1 bit] • 3.5.1.4.10 4
OM,
Operational
Mode
8
8b: IDENT Switch Active
8c: Reserved for Receiving ATC services
8d: Single Antenna Flag
8e: System Design Assurance
[1 bit]
[1 bit]
[1 bit]
[2 bits]
3.5.1.4.10
3.5.1.4.10
3.5.1.4.10
3.5.1.4.10
3
8f: GPS Antenna Offset [8 bits] 3.5.1.4.10
(Reserved for future growth) [2 bits] 3.5.1.4.10
9a Nav. Acc. Category for Position (NACP) [4 bits] • 3.5.1.4.11 4
9b Nav. Acc. Category for Velocity (NACV ) [3 bits] • 3.5.1.4.12 4
SV Quality
9c
9d
Source Integrity Level (SIL)
NICBARO - Altitude Cross Checking Flag
[2 bits]
[1 bit]
• 3.5.1.4.13
3.5.1.4.14
4
9e Geometric Vertical Accuracy (GVA) [2 bits] 3.5.1.4.15
9f (Reserved for future growth) [2 bits] 3.5.1.4.16
Data 10a True/Magnetic Heading [1 bit] 3.5.1.4.17
Reference 10b Vertical Rate Type (Baro./Geo.) [1 bit] 3.5.1.4.18
Other 11 Reserved for Flight Mode Specific Data [3 bits] 3.5.1.4.19
Notes for Table 3.5.1.4:
1. The minimum number of bits required by this MASPS for the Address Qualifier field
is just one bit. However, when ADS-B is implemented on a particular data link, more
than one bit may be required for the address qualifier if that data link supports other
services in addition to the ADS-B service. For example, address qualifier bits might
be needed to distinguish reports about TIS-B targets from reports about ADS-B
targets. The number of bits allocated for the Address Qualifier field may be different
on different ADS-B data links.
2. The aircraft size code only has to be transmitted by aircraft above a certain size, and
only while those aircraft are on the ground. (See §3.5.1.4.6 for details.)