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Note 2.- RAs may terminate for a number of reasons; normally, when the conflict has been resolved and the threat
is diverging in runge; or when tlze threat's Mode S transponder for some reason ceases to report ~llrituded uring the
conflict. The RA terminated irzdicatoi- is used to show that the RA has been removed in each of these cases.
4.3.8.4.2.2.1.4 MTE (multiple tlzreat encounter). This I-bit (60) subfield shall indicate whether two or more
simultaneous threats are currently being processed by the ACAS thrcat resolution logic.
Chapter 4 Annex 10 - Aeronautical Telecommunications
Coding
0 One threat is being processed by the resolution logic (when ARA bit 41 = 1); or no threat is
being processed by the resolution logic (when ARA bit 41 = 0)
1 Two or more simultaneous threats are being processed by the resolution logic
4.3.8.4.2.2.1.5 7TI (threat type indicator subfield). This 2-bit subfield (61-62) shall define the type of identity data
contained in the TID subfield.
Codittg
0 No identity data in TID
1 TID contains a Mode S transponder address
2 TID contains altitude, range and bearing data
3 Not assigned
4.3.8.4.2.2.1.6 TID (threat identity data subfield). This 26-bit subfield (63-88) shall contain the Mode S address of
the threat or the altitude, range, and bearing if the threat i s not Mode S equipped. If two or more threats are simultaneously
processed by the ACAS resolution logic, TID shall contain the identity or position data for the most recently declared
threat. If TTI = 1, TID shall contain in bits 63-86 the aircraft address of the threat, and bits 87 and 88 shall be set to 0.
If TTI = 2, TID shall contain the following three subfields.
4.3.8.4.2.2.1.6.1 TIDA (threat identity data altitude subfield). This 13-bit subfield (63-75) shall contain the most
recently reported Mode C altitude code of the threat.
Coding
Bit 63 64 65 66 67 68 69 70 71 72 73 74 75
Mode C code bit C1 AI C? A2 CA % 0 BI DI B? D7 B4 D4
4.3.8.4.2.2.1.6.2 TIDR (threat identity data range subfield). This 7-bit subfield (76-82) shall contain the most recent
threat range estimated by ACAS.
Coding (n)
n Estimated range (NM)
0 No range estimate available
1 Less than 0.05
2-126 (n-l)/lO d.05
127 Greater than 12.55
4.3.8.4.2.2.1.6.3 TIDE (threat identity data bearing subfield). This 6-bit subfield (83-88) shall contain the most recent
estimated bearing OF the threat aircraft, relative to the ACAS aircraft heading.
Coding (n)
n Estimated bearing (degrees)
0 No bearing estimate available
1-60 Between 6(n-1) and 6n
61-63 Not assigned
Note.- Structure of MB for an RA report:
BDS1=3
BDS1=3
BDSP=O
36 40 54 58 59 60 62 75 82 88
BDS2= 0
ARA
ARA
RAC
R AC
RAT
RAT
MTE
MTE
TTI= 1 TID
rn-2 TlDA TlDR TlDB
Annex 10 - Aeronautical Telecommunications Volume ZV
4.3.8.4.2.2.2 Subfields in MB for the data link capability report. When BDSl = 1 and BDS2 = 0, the following bit
patterns shall be provided to the transponder for its data link capability report:
Bit Coding
48 0 ACAS failed or on standby
1 ACAS operating
69 OACAS I1
1 ACAS III
70 0 ACAS generating TAs only
1 ACAS generating TAs and RAs
7 1 0 ACAS not fitted
1 ACAS fitted
72 0 Hybrid surveillance not fitted . ,
I Hybrid surveillance fitted
Note 1.- A summary of the MB subfields for the data link capability report structure is described in Chapter 3,
3.1.2.6.10.2.2.
Note 2.- The use of hybrid surveillance to limit ACAS active interrogations is described in 4.5.1. The ability only to
supper? decoding of DF = 17 exterzded squitter nwssnges is trot su$icicttt to set bit 72.
4.3.8.4.2.3 MUJield. This 56-bit (33-88) field of long air-air surveillance interrogations (Figure 4-1) shall be used to
transmit resolution messages, ACAS broadcasts and RA broadcasts.
4.3.8.4.2.3.1 UDS (U-definition subfield). This 8-bit (33-40) subfield shall define the remainder of MU.
Note.- For convenience in coding, UDS is expressed in two groups of four bits each, LIDS1 and UDS2.
4.3.8.4.2.3.2 Subjields in MU for a resolution message. When UDS1 = 3 and UDS2 = 0 the following subfields shall
be contained in MU:
4.3.8.4.2.3.2.1 MTB (multiple threat bit). This 1-bit (42) subfield shall indicate the presence or absence of multiple
threats.
Coding
0 Interrogating ACAS has one threat
1 Interrogating ACAS has more than one threat
4.3.8.4.2.3.2.2 VRC (vertical RAC). This 2-bit (45-46) subfield shall denote a vertical RAC relating to the addressed
aircraft.
Coding
0 No vertical RAC sent
1 Do not pass below
2 Do not pass above
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