Fix rate at 4 sec.

34-61-14

Page May 10, 200750

L. IFDS and AHCAS/AHCAS2 EFIS Interface Description

(1) IFDS/AHCAS/AHCAS2 to FMS Summary

The FMS will receive from the IFDS or AHCAS2 units the following input ARINC 429 labels and decode them via the input EFIS (EFI) equipment:

LABEL-EQUIP ID DESCRIPTION RATE

071 -025 AHCAS Joystick Discrete Word 1 25 ms 111 - 025 AHCAS Joystick Discrete Word 2 25 ms

113 - 025 Aircraft gross weight 200 ms

167 - 025 Hover height 40 ms

273 - 025 Roll/Yaw Active mode 200 ms

275 - 025 Return Armed mode (Automatic Hover mode) 40 ms

320 - (all) Heading Angle 20 ms

320 - 005b AHCAS Heading Angle 25 ms

320 - 005 AHRS Status Word 80 ms

360 - 025 AHCAS Joystick Latitude 150 ms

361 - 025 AHCAS Joystick Longitude 150 ms

(2) FMS to IFDS/AHCAS Link Summary (a) Navigation Sub-frame

Except for labels 124 and 125, all other labels are sent with SDI=00 for this sub-frame. Labels 124 and 125 will be sent with SDI 00 (used by the Plan sub-frame) and 10 (used by the Preparation sub-frame).

The FMS will transmit the following ARINC 429 labels over the Navigation sub-frame at specific rates as defined in the table below.

LABELS-EQUIP ID DESCRIPTION RATE

012-002 Ground speed (BCD) 333.33 ms

026-002c Active route ident (first 7, 8 and 9) 1000 ms 027-002c Active route ident (first 10, 11 and 12) 1000 ms 036-002c Active route ident (characters 1, 2 and 3) 1000 ms 037-002c Active route ident (characters 4, 5 and 6) 1000 ms

076-002a GPS altitude 200 ms

113-002c Selected radial – magnetic 333.33 ms 114-002b Desired track DTK – magnetic 333.33 ms

115-002 Bearing next waypoint 200 ms

116-002 Cross track distance XTK 100 ms

117-002a VERTICAL DEVIATION 100 msec

120-002a FMS Latitude Fine 200 ms

120-002a FMS Longitude Fine 200 ms

124-002c TO waypoint number and Destination type 1000 ms 125-002c Pattern type & starting waypoint number 1000 ms

34-61-14

Page May 10, 200751

150-002 GMT Time 1000 ms

163-002 Track Angle Error TKE 333.33 ms

164-002 Radio height 200 ms

201-002 Distance to go (BCD) 333.33 ms

203-002 Pressure Altitude 200 ms

204-002 (FMS) Baro Corrected Altitude 200 ms

216-002 Cross Track Offset 1000 ms

220-002 ALT INS/GPS 200 ms 251-002 Distance to go (BNR) 100 ms 252-002 Time to go 1000 ms 260-002c Date 1000 ms 266-002 H/C Delta Mass 333.33 ms 270-002c FMS Status (IFDS) 200 ms 270-002d FMS Status (AHCAS) 200 ms

275-002a FMS Status word 2 333.33 ms

300-002a ACK of DMAP wpt xfer / True/Mag 200 ms

304-002s Magnetic variation 1000 ms

310-002a FMS Latitude Coarse 200 ms

311-002a FMS Longitude Coarse 200 ms

312-002 Ground speed (BNR) 200 ms

314-002 True Heading 200 ms

315-002 Wind speed 1000 ms

317-002c Track angle – magnetic 200 ms

321-002a Drift angle 333.33 ms

326-002 HIS scale 333.33 ms

340-002 PLS Waypoint Latitude 200 ms

341-002 PLS Waypoint Longitude 200 ms

342-002 DMAP Center Waypoint Latitude 1000 ms 343-002 DMAP Center Waypoint Longitude 1000 ms

372-002 Wind direction – magnetic 1000 ms

(b) Waypoint Data Sub-frames 1 Sector Sub-frame

This sub-frame will contain all the parameters defining an active flight plan or pattern. The FMS will transmit this sub-frame all the time with all the parameters having SDI=00 and a refresh rate of 1800 ms (which makes this sub-frame distinct of the "navigation" sub-frame). The parameters that are not used are sent with SSM NCD. The parameters of this frame are listed in the table above. The transmission order of this sub-frame is as follows: FROM, TO, TO+1, …, TO+9.

For a Hover procedure the sector sub-frame will contain the TDN and MRK waypoints in the last but one and respectively last position of the transmission.

34-61-14

Page May 10, 200752 2 Plan Sub-frame

This sub-frame will contain all the parameters necessary to define an active flight plan or pattern. The FMS will transmit this sub-frame all the time with all parameters having SDI = 01 and a refresh rate of 1800 ms. The parameters that are not used are sent with SSM NCD. The sub-frame update is done in increasing order starting with the CENTER waypoint and finishing with waypoint (TO+9). The parameters of this sub-frame are listed in the table above.

In order to properly display the Plan sub-frame information, the IFDS will use the information sent in the ARINC labels 124-00 and 125-00 of the navigation sub-frame. For a Hover procedure the plan sub-frame will contain the TDN and MRK waypoints always in the (TO+8) and (TO+9) positions.

3 Preparation Sub-frame

This sub-frame will contain all the parameters necessary to define a flight plan or a pattern that is being prepared (see NOTE 1). This sub-frame is sent all the time. All the parameters are sent with SDI = 10 and a refresh rate of 1800 ms. Unused parameters are sent with SSM NCD.

Patterns are transmitted in the Preparation sub-frame only when there is no active hover procedure, holding pattern and search pattern in the Active route.

In the particular case of waypoint identifiers, the waypoint ident parameters will always be sent NCD, except when the Inactive route is transmitted in the Preparation sub-frame, in which case the waypoint ident parameters are sent with SSM NORM only for those waypoints defined in the Inactive route.

This sub-frame will contain all the parameters necessary to transmit the information related to one of the procedures or route selected according to the priority logic defined below:

• an offset leg if one is defined in the Active route; else

• a holding pattern if a holding pattern waypoint is defined in the Active route or • modified Active route and is located in the route before any discontinuity (if • one exists) and before any search waypoint (if one exists) which was not • created off-route (see NOTE 2); else

• a search pattern if a search pattern waypoint is defined in the Active route or • modified Active route and is located in the route before any discontinuity (if • one exists); else

• the Inactive route, if one is defined.

NOTE 1: In order to display correctly the Preparation sub-frame, the IFDS uses the

In document CMA9000 Manual (Page 78-81)