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20-3 1 See Chapter 3, 3.1.2.6.1.2
4.3.8.4.2 ACAS FIELDS AND SUBFIELDS
Note.-- The following paragraphs describe the location and coding of those 9elds and subfields that are not defined
in Chapter 3, 3.1.2 but are used by aircraft equipped with ACAS.
Chapter 4 Arerzex 10 - Aeronautical Telecommunications
4.3.8.4.2.1.1 ADS (A-definition subfield). This 8-bit (33-40) subfield shall definc the remainder of MA
Note.- For conveizience of'codirag, ADS is expressed in tcvo groups of four bits each, ADS1 and ADS2.
4.3.8.4.2.1.2 When ADS1 = 0 and ADS2 = 5, the following subfield shall be contained in MA:
4.3.8.4.2.1.3 SLC (ACAS sensitivity level control (SLC) command). This 4-bit (41-44) subfield shall dennt~ a
sensitivity level command for own ACAS.
Coding
0
1
2
3
4
5
6
7 14
15
No command issued
Not assigned
Set ACAS sensitivity level to 2
Set ACAS sensitivity level to 3
Set ACAS sensitivity level to 4
Set ACAS sensitivity level to 5
Set ACAS sensitivity level to 6
Not assigned
Cancel previous SLC command from this ground station
Note.- Structure of MA for a sensitivity level control command:
4.3.8.4.2.2.1 Suwelds in MB for an RA report. When BDSl = 3 and BDS2 = 0, the subiiclds indicated below shall
be contained in MB. For 18+1 s following the end of an RA, all MB subfields in the RA report with the exception of bit
59 (Mte rminated indicator) shall retain the information reported at thc time the RA was last active.
ADS1 = 0
4.3.8.4.2.2.1.1 AM (active RAs). This ICbit (41-54) subtield shall indicate the characteristics of the RA, if any,
generated by the ACAS associated with the transponder transmitting the subfield (4.3.6.2.1 a)). The bits in ARA shall have
meanings determined by the value of the MTE subfield (4.3.8.4.2.2.1.4) and, for vertical RAs, the value of bit 41 of ARA.
The meaning of bit 41 of ARA shall be as follows:
Coding
0 There is more than one threat and the RA is intended to provide separation
below some threat(s) and above some other thxeat(s) or no RA has been
generated (when MTE = 0)
1 Either there is only one threat or the RA is intended to provide separation in
the same direction for all threats
ADS2 = 5
When ARA bit 41 = 1 and MTE = 0 or 1, bits 42-47 shall have the following meanings:
SLC - - - 44 - - --
Bit Coding
42 0 RA is preventive
1 RA is corrective
43 0 Upward sense RA has been generated
1 Downward sense RA has been generated
44 0 RA is not increased rate
1 RA is increased rate
Annex 10 - Aerorzautical Telecommunications Volume IV
45 0 RA is not a sense reversal
1 RA is a sense reversal
46 0 RA is not altitude crossing
I RA is altitude crossing
47 0 RA is vertical speed limit
1 RA is positive
48-54 Reserved for ACAS III
When ARA bit 41 = 0 and MTE = 1, bits 42-47 shall have the followirrg mca~~irlgs:
Bit
42
Coding
0
1
0
1
0
1
0
I
0
1
0
I
RA does not require a correction in the upward sense
RA requires a correction in the upward sense
RA does not require a positive climb
RA requires a positive climb
RA does not require a correction in the downward sense
RA requires a correction in the downward sense
RA does not require a positive descend
RA requires a positive descend
RA docs not require a crossing
RA requires a crossing
RA is not a sense reversal
RA is a sense reversal
Reserved for ACAS ID
Note.- When ARA bit 41 = 0 and MTE = 0, no vertical RA has been generated.
4.3.8.4.2.2.1.2 PvlC (RACs I ~ C U I ~T) h. i s 4-bil (55-58) subfield shall indicate all the currently active RACs, if any,
received from other ACAS aircraft. The bits in RAC shall have the following meanings:
Bit Resolution advisory complement
55 Do not pass below
56 Do not pass above
57 Do not turn left
58 Do not turn right
A bit set to 1 shall indicate that the associated RAC is active. A bit set to 0 shall indicate that the associated RAC is
inactive.
4.3.8.4.2.2.1.3 RAT (RA terminated indimtor). This I-bit (59) suhfield shall indicate when an RA previously
generated by ACAS has ceased being generated.
Coding
0 ACAS is currently generating the RA indicated in the ARA subfield
1 The Rh indicated by the ARA subfield has been terminated (4.3.11.4.1)
Note 1.- After an RA has been terminated by ACAS, it is still required to be reported by the Mode S transponder for-
I S e l s (4.3.11.4.1). The RA terminated indicutor may be used, for example, topermir timely removal of an RA rndicatiott
from an arr rraflc controller's displa)i, orfor assessments oj KA duration within a particular airspace.
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