Note from the editor........................................................................... 5
Certification
specification................................................................... 6
Acceptable means of compliance....................................................... 6
Guidance
material............................................................................... 6
Incorporated
amendments................................................................. 7
Table of contents................................................................................. 8
Subpart A — General......................................................................... 24
AMC1 ACNS.A.GEN.010 Instructions for Continued
Airworthiness.............................. 33
AMC1 ACNS.A.GEN.015(a) Aircraft documentation.................................................... 35
Subpart B — Communications (COM).............................................. 37
CS ACNS.B.VCS.010 Voice Communication System........................................... 39
CS ACNS.B.VCS.020 Performance requirements............................................... 40
CS ACNS.B.VCS.040 Flight Deck Interface........................................................ 43
CS ACNS.B.DLS.B1.005 Installation Requirements............................................. 45
CS ACNS.B.DLS.B1.010 Flight Deck Interface..................................................... 46
CS ACNS.B.DLS.B1.015 Dual Data Link Capabilities
(Dual stack)......................... 48
CS ACNS.B.DLS.B1.020 Data Link Services........................................................ 50
CS ACNS.B.DLS.B1.025 Protection mechanism.................................................. 52
CS ACNS.B.DLS.B1.035 DLS system continuity.................................................. 55
CS ACNS.B.DLS.B1.040 Universal Time Coordinated
(UTC)................................ 56
CS ACNS.B.DLS.B1.050 DLIC Uplink Messages................................................... 57
CS ACNS.B.DLS.B1.055 DLIC Downlink Messages.............................................. 58
CS ACNS.B.DLS.B1.060 DLIC initiation when in
‘CPDLC inhibited’ state (uplink)... 59
CS ACNS.B.DLS.B1.070 CPDLC uplink messages................................................ 60
CS ACNS.B.DLS.B1.075 CPDLC downlink messages............................................ 64
CS ACNS.B.DLS.B1.080 Data link initiation
capability (DLIC) service.................... 67
CS ACNS.B.DLS.B1.085 ATC communications management
(ACM) service.......... 68
AMC1 ACNS.B.DLS.B1.085 ATC Communications
Management (ACM) Service........................ 68
GM1 ACNS.B.DLS.B1.085 ATC Communications Management
(ACM) Service.......................... 68
CS ACNS.B.DLS.B1.090 ACL service safety requirements................................... 69
CS ACNS.B.DLS.B1.095 ATC microphone check
(AMC) service............................ 70
CS ACNS.B.DLS.B1.100 Network Layer Requirements........................................ 71
CS ACNS.B.DLS.B1.105 Transport Layer Protocol
Requirements........................ 72
CS ACNS.B.DLS.B1.110 Session Layer Requirement........................................... 74
CS ACNS.B.DLS.B1.115 Presentation layer
requirements................................... 75
CS ACNS.B.DLS.B1.120 Application Layer Requirements.................................... 76
Appendix A – Background information on voice
communication systems.................... 77
Appendix B – Background information on data link
systems....................................... 77
Subpart C — Navigation (NAV)......................................................... 79
Subsection 2 – Generic specifications for
performance-based lateral navigation......... 83
SYSTEM QUALIFICATION CRITERIA................................................................... 84
CS ACNS.C.PBN.225 Reasonableness check of
distance-measuring equipment (DME).............. 91
Subsection 3 – Supplementary specifications for lateral
navigation in final approach. 115
SUPPLEMENTARY FUNCTIONAL CRITERIA....................................................... 116
CS ACNS.C.PBN.330 Non-numeric lateral deviation display
scaling for approach.................... 121
Subsection 4 – Supplementary specifications for vertical
navigation......................... 122
SUPPLEMENTARY FUNCTIONAL CRITERIA....................................................... 123
Subsection 5 – Supplementary specifications for vertical
navigation in final approach 126
SUPPLEMENTARY FUNCTIONAL CRITERIA....................................................... 127
CS ACNS.C.PBN.535 Resolution and full-scale deflection
of the vertical deviation display...... 133
SUPPLEMENTARY PERFORMANCE CRITERIA................................................... 137
CS ACNS.C.PBN.560 Vertical accuracy when using SBAS/GNSS
geometric altitude sources.... 140
Subsection 6 – Supplementary specifications for RNP
authorisation required (RNP AR) 145
SUPPLEMENTARY SYSTEM QUALIFICATION.................................................... 146
SUPPLEMENTARY FUNCTIONAL CRITERIA....................................................... 150
SUPPLEMENTARY PERFORMANCE CRITERIA................................................... 162
Subsection 7 – Supplementary specifications for
applications for advanced RNP (A-RNP) 164
SUPPLEMENTARY FUNCTIONAL CRITERIA....................................................... 165
Subsection 8 – Supplementary specifications supporting
radius to fix (RF)................ 169
SUPPLEMENTARY FUNCTIONAL CRITERIA....................................................... 170
Subsection 9 – Supplementary specifications supporting
fixed radius transition (FRT) 174
SUPPLEMENTARY FUNCTIONAL CRITERIA....................................................... 175
Subsection 10 – Supplementary specifications supporting
parallel offset.................. 177
SUPPLEMENTARY FUNCTIONAL CRITERIA....................................................... 178
Subpart D — Surveillance (SUR)...................................................... 204
CS ACNS.D.AC.010 Transponder characteristics.............................................. 206
CS ACNS.D.AC.015 Data transmission............................................................ 208
CS ACNS.D.AC.020 Altitude source................................................................ 209
CS ACNS.D.AC.025 Flight deck interface......................................................... 210
CS ACNS.D.AC.040 Dual/multiple transponder
installation.............................. 213
CS ACNS.D.AC.045 Antenna installation......................................................... 214
CS ACNS.D.ELS.010 Transponder characteristics............................................. 216
CS ACNS.D.ELS.015 Data transmission........................................................... 218
CS ACNS.D.ELS.020 On-the-ground status
determination................................ 221
CS ACNS.D.ELS.025 Altitude
source............................................................... 222
CS ACNS.D.ELS.030 Flight deck interface........................................................ 224
CS ACNS.D.ELS.050 Dual/multiple transponder
installation............................. 227
CS ACNS.D.ELS.055 ICAO 24-bit Aircraft address............................................. 228
CS ACNS.D.ELS.060 Antenna installation........................................................ 229
CS ACNS.D.ELS.065 Antenna diversity............................................................ 230
CS ACNS.D.EHS.010 Transponder characteristics............................................ 232
CS ACNS.D.EHS.015 Data transmission........................................................... 233
CS ACNS.D.ADSB.010 ADS-B Out system approval.......................................... 240
CS ACNS.D.ADSB.020 ADS-B Out Data Parameters.......................................... 241
CS ACNS.D.ADSB.025 Provision of data.......................................................... 243
AMC1 ACNS.D.ADSB.025(c) Provision of data – Data
quality indication and associated data 243
CS ACNS.D.ADSB.030 ADS-B Transmit Unit Approval....................................... 245
CS ACNS.D.ADSB.035 ICAO 24-bit Aircraft address.......................................... 246
CS ACNS.D.ADSB.040 Antenna diversity......................................................... 247
CS ACNS.D.ADSB.045 Antenna installation..................................................... 248
CS ACNS.D.ADSB.050 Transmit power............................................................ 249
CS ACNS.D.ADSB.055 Simultaneous operation of ADS-B
transmit units............ 250
AMC1 ACNS.D.ADSB.055 Simultaneous operation of
ADS-B transmit units........................... 250
CS ACNS.D.ADSB.060 On-the-ground status
determination............................. 251
CS ACNS.D.ADSB.070 Horizontal Position and Velocity
Data Sources............... 252
CS ACNS.D.ADSB.080 Data Sources as defined by Mode
S Elementary and Enhanced Surveillance 255
AMC1 ACNS.D.ADSB.080 Data sources as defined
by Mode S elementary and enhanced surveillance 255
CS ACNS.D.ADSB.085 Geometric Altitude....................................................... 257
CS ACNS.D.ADSB.090 Flight deck interface..................................................... 259
Horizontal Position and Velocity Data Refresh Rate and
Latency............................... 262
CS ACNS.D.ADSB.110 Horizontal position and
velocity data refresh rate.......... 263
CS ACNS.D.ADSB.115 Horizontal Position and Velocity
Total Latency............... 264
CS ACNS.D.ADSB.120 Horizontal Position
Uncompensated Latency................. 265
AMC1 ACNS.D.ADSB.115 and 120 Horizontal Position
and Velocity Total and Uncompensated Latency 265
Appendix A – Background information on Mode A/C
surveillance systems................ 266
Appendix B – Background information on Mode S ELS............................................. 268
Appendix C – Background information on Mode S EHS............................................. 271
Appendix D – Differences between CS ACNS.D.ELS
and JAA TGL 13 Rev1................... 276
Appendix E – Differences between CS ACNS.D.EHS
and EASA AMC 20-13.................. 276
Appendix F – Example of Flight Manual Supplement for
ELS/EHS.............................. 277
Appendix G – Example of Flight Manual Supplement for
ADS-B out.......................... 278
Appendix H – Guidance on 1090-MHz extended squitter
ADS-B Out......................... 280
Appendix I – On-the-ground status Test and Validation
Guidance for Aeroplanes...... 304
Appendix J – Comparison between EASA CS ACNS.D.ADSB and
FAA AC 20-165A Requirements 305
Subpart E — Others......................................................................... 307
CS ACNS.E.TAWS.001 Applicability................................................................ 308
CS ACNS.E.TAWS.005 TAWS Equipment Approval........................................... 309
CS ACNS.E.TAWS.010 Required Functions and
Interfaces................................ 310
CS ACNS.E.TAWS.015 FLTA function requirements......................................... 312
CS ACNS.E.TAWS.020 PDA function requirements.......................................... 314
CS ACNS.E.TAWS.025 Class A TAWS inhibition................................................ 315
CS ACNS.E.TAWS.030 Terrain information display.......................................... 316
CS ACNS.E.TAWS.035 Aural and visual alerts.................................................. 317
CS ACNS.E.TAWS.045 Continuity................................................................... 321
CS ACNS.E.TAWS.055 Terrain and airport information.................................... 323
CS ACNS.E.TAWS.060 Positioning information................................................ 324
CS ACNS.E.TAWS.070 Failure mode............................................................... 326
CS ACNS.E.TAWS.075 Prioritisation scheme................................................... 327
CS ACNS.E.TAWS.080 Pop-up mode............................................................... 329
Appendix A – TAWS installations testing guidance material............................ 329
Appendix B – Example of an acceptable TAWS installation.............................. 331
Appendix C – Background information on terrain awareness
and warning systems (TAWSs) 332
CS ACNS.E.RVSM.001 Applicability................................................................ 335
CS ACNS.E.RVSM.005 RVSM system............................................................... 336
CS ACNS.E.RVSM.010 Required functions...................................................... 337
CS ACNS.E.RVSM.025 Continuity................................................................... 339
CS ACNS.E.RVSM.030 RVSM system performance.......................................... 340
CS ACNS.E.RVSM.035 Altimetry system accuracy............................................ 341
APPENDIX A – ALTIMETRY SYSTEM ERROR COMPONENTS............................... 345
CS ACNS.E.LAD.001 Applicability and
scope................................................... 355
CS ACNS.E.LAD.020 System approval............................................................. 360
CS ACNS.E.LAD.110 Transmission of the
activation signals.............................. 362
CS ACNS.E.LAD.120 Repeated
transmission of the activation signals................ 364
CS ACNS.E.LAD.130 Transmission of the deactivation
signals.......................... 365
CS ACNS.E.LAD.140 Activation signals —
essential information....................... 366
CS ACNS.E.LAD.150 Activation signals —
supplementary................................ 367
CS ACNS.E.LAD.160 Deactivation signals
— essential information................... 368
CS ACNS.E.LAD.170 Transmission of a
homing signal...................................... 369
CS ACNS.E.LAD.210 Normal operation........................................................... 371
CS ACNS.E.LAD.230 Continued operation
after losing normal electrical power. 372
GM1 ACNS.E.LAD.230 Continued operation
after losing normal electrical power................ 372
GM2 ACNS.E.LAD.230 Continued operation
after losing normal electrical power................ 372
CS ACNS.E.LAD.240 Automatic activation....................................................... 374
CS ACNS.E.LAD.250 Manual activation........................................................... 376
CS ACNS.E.LAD.260 Automatic
deactivation................................................... 377
CS ACNS.E.LAD.270 Manual deactivation....................................................... 378
CS ACNS.E.LAD.280 Indications to the
flight crew and self‑monitoring............. 379
CS ACNS.E.LAD.290 Means to analyse
automatic activation............................ 380
CS ACNS.E.LAD.310 Environmental and
crash conditions encountered during accidents 381
AMC1 ACNS.E.LAD.310 Environmental and crash
conditions encountered during accidents 381
AMC2 ACNS.E.LAD.310 Environmental and crash
conditions encountered during accidents 384
AMC3 ACNS.E.LAD.310 Environmental and crash
conditions encountered during accidents 384
AMC4 ACNS.E.LAD.310 Environmental and crash
conditions encountered during accidents 385
GM1 ACNS.E.LAD.310 Environmental and
crash conditions encountered during accidents 385
CS ACNS.E.LAD.320 Flight dynamics and
locating the aircraft.......................... 386
CS ACNS.E.LAD.340 Activation and
transmission over water and over land...... 390
AMC1 ACNS.E.LAD.340 Activation and transmission
over water and over land.................... 390
CS ACNS.E.LAD.350 Means and procedures
to prevent undesirable activation. 391
AMC1 ACNS.E.LAD.350 Means and procedures to prevent
undesirable activation.............. 391
GM1 ACNS.E.LAD.350 Means and procedures
to prevent undesirable activation................ 391
CS ACNS.E.LAD.360 Shared airborne
resources and transmission means......... 392
GM1 ACNS.E.LAD.360 Shared airborne
resources and transmission means........................... 392
CS ACNS.E.LAD.410 Position accuracy
for non-survivable accidents................. 393
CS ACNS.E.LAD.420 Position accuracy
for survivable accidents........................ 395
CS ACNS.E.LAD.520 Frequency spectrum....................................................... 396
CS ACNS.E.LAD.650 Risk for third
parties....................................................... 399
Appendix A — Example flight trajectory......................................................... 399
EASA's CS-ACNS defines airworthiness certification specifications for aircraft communication, navigation, and surveillance systems. It covers voice/data link communication, performance-based navigation (PBN) including RNP, surveillance systems like ADS-B, TAWS, RVSM, and aircraft location in distress. The goal is to ensure safety and interoperability.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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