Appendix F F-13 F.3.12.7.2.4.2 LNAV is set to “ONE” as the FMS is now providing lateral guidance to the aircraft.
F.3.12.7.2.4.3 Selected Altitude field is populated with MCP/FCU selected altitude and the selected altitude type is set to MCP/FCU.
F.3.12.8 Step 7 F.3.12.8.1 Assumptions:
F.3.12.8.1.1 ATC provides the pilot with a final altitude clearance.
F.3.12.8.1.2 The FMS system will fly a step down approach to the cleared altitude.
F.3.12.8.2 Maneuver: Step Down Approach to Waypoint 8 F.3.12.8.2.1 The pilot enters the final altitude clearance into the MCP/FCU. The pilot continues the use of the Autopilot system. The pilot continues the use of the FMS as the vertical and lateral guidance source for the aircraft. The approach mode remains engaged. The transponder will set the parameters as follows:
F.3.12.8.2.2 BDS 4016 and BDS 6216 Parameters:
F.3.12.8.2.2.1 VNAV is set to “ONE” as the aircraft is now using information from the FMS system.
F.3.12.8.2.2.2 Altitude Hold remains set to “ZERO” F.3.12.8.2.2.3 Approach Mode is set to “ONE.”
F.3.12.8.2.3 BDS 4016 Specific Parameters:
F.3.12.8.2.3.1 Target Altitude Source represents the use of the FMS
(i.e., “11”) as the source for selected altitude information.
F.3.12.8.2.3.2 Reserved F.3.12.8.2.4 BDS 6216 Specific Parameters:
F.3.12.8.2.4.1 Autopilot Engage is set to “ONE.”
F.3.12.8.2.4.2 LNAV is set to “ONE” as the FMS is now providing lateral guidance to the aircraft.
F.3.12.8.2.4.3 Selected Altitude field is populated with MCP/FCU selected altitude and the selected altitude type is set to MCP/FCU.
Appendix F F-14 Figure F- 2. Format of BDS register 4016, Selected Vertical Intent Information 1 STATUS PURPOSE: To provide ready access to information about the aircraft’s current vertical intentions, in order to improve the effectiveness of conflict probes and to provide additional tactical information to controllers.
1) Target altitude shall be the short-term intent value, at which the aircraft will level off (or has leveled off) at the end of the current maneuver. The data source that the aircraft is currently using to determine the target altitude shall be indicated in the altitude source bits (54 to 56) as detailed below.
Note. This information which represents the real “aircraft intent,” when available, represented by the altitude control panel selected altitude, the flight management system selected altitude, or the current aircraft altitude according to the aircraft’s mode of flight (the intent may not be available at all when the pilot is flying the aircraft).
2) The data entered into bits 1 to 13 shall be derived from the mode control panel/flight control unit or equivalent equipment. Alerting devices may be used to provide data if it is not available from “control” equipment. The associated mode bits for this field (48 to 51) shall be as detailed below.
3) The data entered into bits 14 to 26 shall be derived from the flight management system or equivalent equipment managing the vertical profile of the aircraft.
4) The current barometric pressure setting shall be calculat ed from the value contained in the field (bits 28 to 39) plus 800 mb.
When the barometric pressure setting is less than 800 mb or greater than 1 209.5 mb, the status bit for this field (bit 27) shall be set to indicate invalid data.
5) Reserved bits 40 to 47 shall be set to ZERO (0).
6) Bits 48 to 56 shall indicate the status of the values provided in bits 1 to 26 as follows:
Bit 48 shall indicate whether the mode bits (49, 50 and 51) are already being populated:
1.
2. 0 = No mode information provided
3. 1 = Mode information deliberately provided
4.
Bits 49, 50 and 51:
5.
6. 0 = Not active
7. 1 = Active
8.
9. Reserved bits 52 and 53 shall be set to ZERO (0).
10.
Bit 54 shall indicate whether the target altitude source bits (55 and 56) are actively being populated:
11.
12. 0 = No source information provided
13. 1 = Source information deliberately provided
14.
Bits 55 and 56 shall indicate target altitude source:
15.
16. 00 = Unknown
17. 01 = Aircraft altitude
18. 10 = FCU/MCP selected altitude
19. 11 = FMS selected altitude
20.
21. .
2 MSB = 32 768 feet 3 4 5 MCP/FCU SELECTED ALTITUDE 6 7 Range = [0, 65 520] feet 8 9 10 11 12 13 LSB = 16 feet 14 STATUS 15 MSB = 32 768 feet 16 17 18 FMS SELECTED ALTITUDE 19 20 Range = [0, 65 520] feet 21 22 23 24 25 26 LSB = 16 feet 27 STATUS 28 MSB = 204.8 mb 29 30 31 32 BAROMETRIC PRESSURE SETTING 33 MINUS 800 mb 34 35 Range = [0, 410] mb 36 37 38 39 LSB = 0.1 mb 40 41 42 43 44 RESERVED 45 46 47 48 STATUS OF MCP/FCU MODE BITS 49 VNAV MODE 50 ALT HOLD MODE MCP/FCU Mode bits 51 APPROACH MODE 52 RESERVED 53 54 STATUS OF TARGET ALT SOURCE BITS 55 MSB TARGET ALT SOURCE 56 LSB
Appendix F F-15 Figure F- 3. Format of BDS register 6216, Target State and Status Information (Subtype 1; Compatible with ADS-B Version Number = 2) 1 PURPOSE: To provide aircraft state and status 2 information.
3 FORMAT TYPE CODE = 29 4 5 6 MSB SUBTYPE CODE = 1 7 LSB 8 SIL SUPPLEMENT (0=Per Hour, 1=Per Sample) 9 SELECTED ALTITUDE TYPE (0=MCP/FCU, 1=FMS) 10 MSB = 32768 feet 11 MCP / FCU SELECTED ALTITUDE 12 (when Selected Altitude Type = 0) 13 FMS SELECTED ALTITUDE 14 (when Selected Altitude Type = 1) 15 Coding: 111 1111 1111 = 65472 feet 16 *** **** **** 17 000 0000 0010 = 32 feet 18 000 0000 0001 = 0 feet 19 000 0000 0000 = No data or Invalid 20 LSB = 32 feet 21 MSB = 204.8 millibars 22 BAROMETRIC PRESSURE SETTING (MINUS 800 millibars) 23 Range = [0, 408.0] Resolution = 0.8 millibars 24 Coding: 1 1111 1111 = 408.00 millibars 25 * **** **** 26 0 0000 0010 = 0.800 millibars 27 0 0000 0001 = 0.000 millibars 28 0 0000 0000 = No Data or Invalid 29 LSB = 0.8 millibars 30 STATUS (0=Invalid, 1=Valid) 31 Sign (0=Positive, 1=Negative) 32 MSB = 90.0 degrees 33 34 SELECTED HEADING 35 Range = [+/- 180] degrees, Resolution = 0.703125 degrees 36 (Typical Selected Heading Label = “101”) 37 38 39 LSB = 0.703125 degrees (180/256) 40 MSB 41 NAVIGATION ACCURACY CATEGORY FOR POSITION (NACP) 42 43 LSB 44 NAVIGATION INTEGRITY CATEGORY FOR BARO (NICBARO) 45 MSB SOURCE INTEGRITY LEVEL (SIL) 46 LSB 47 STATUS OF MCP / FCU MODE BITS (0 = Invalid, 1 = Valid) 48 AUTOPILOT ENGAGED (0 = Not Engaged, 1 = Engaged) 49 VNAV MODE ENGAGED (0 = Not Engaged, 1 = Engaged) 50 ALTITUDE HOLD MODE (0 = Not Engaged, 1 = Engaged) 51 Reserved for ADS-R Flag 52 APPROACH MODE (0 = Not Engaged, 1 = Engaged) 53 TCAS/ACAS OPERATIONAL (0 = Not Operational, 1 = Operational) 54 LNAV MODE (0 = Not Engaged, 1 = Engaged) 55 MSB RESERVED 56 LSB
Appendix G G-1 APPENDIX G. ADVISORY CIRCULAR FEEDBACK INFORMATION If you find an error in this AC, have recommendations for improving it, or have suggestions for new items/subjects to be added, you may let us know by (1) complete the form online at https://ksn2.faa.gov/avs/dfs/Pages/Home.aspx or (2) emailing this form to 9-AWA-AVS-AIR- DMO@faa.gov Subject: AC 20-151C Date: ___________ Please check all appropriate line items:
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