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“Estimate”: Element contents filled with FMS lat/long estimates, if available.
The TC report provides flexibility for accommodating different TC types and varying amounts of information available onboard the transmitting aircraft. The TC report structure shown in Table 6 represents full reporting capability. Many aircraft may not be equipped to support all of these data elements
The following conditions govern the determination of TC report broadcast for each TCP. These conditions can be applied independently to the horizontal and vertical axis parameters:
1.  
If the transmitting aircraft does not have an autopilot or flight director engaged, then no TC reports are generated. If the aircraft only supports a single axis autopilot or flight director, then the complementary axis data fields for TC reports are marked “unavailable”.

2.  
A stable TTG must be obtained prior to generating intent messages for TC reporting. A TTG value is considered “stable” if the estimated TTG, based on past information, is consistent with the current TTG value, i.e. the difference between the estimated and current TTG value is less than some threshold value. Specific rules for TTG stability will be determined during TC report format validation testing.

Figure 8 and the associated tables (7a and 7b) show one application of these conditions and the command/planned logic described in Section 6. In this example, the aircraft flies a 030 heading to intercept a lateral FMS path (TCP #1) consisting of waypoints ABC (TCP #2) and DEF (TCP #4). The aircraft also climbs at constant vertical speed and levels off at FL210 (TCP #3). Tables 7a and 7b show TC reports for Figure 8 provided by a fully equipped aircraft (able to support all DO-242A elements) and one considered to represent an early (partially equipped) glass cockpit aircraft, respectfully.
The fully equipped aircraft (Table 7a) provides FMS estimates for the latitude and longitude at the intercept point and MCP level off. Altitude estimates are provided at waypoints ABC and DEF. Since heading legs are not supported in ARINC 702A, the track to path intercept must be estimated using the current track. The aircraft will join the planned path with a fly-by turn.

Path Intercept Point

ABC 090 Track Level off at FL210

12
030 Heading
3
DEF
120 Track
Conditional Waypoint

Constant Heading Segment FMS Flight Plan FMS Waypoint 1-4: TCP Numbers

Figure 8. Constant Vertical Speed Climb and Constant Heading to Intercept an FMS Flight Plan
Table 7a. Trajectory Change Report Elements for Figure 8 (Fully Equipped Aircraft)
#  Contents  TC+0 Report Values (TCP 1)  TC+1 Report Values (TCP 2)  TC+2 Report Values (TCP 3)  TC+3 Report Values (TCP 4) 
4  TC Sequence Number  0  1  2  3 
5a  TC Cycle Number  0  0  0  0 
5b  (Reserved)  *  *  *  * 
6  Time to Go (TTG)  TTG-Intercept  TTG-ABC  TTG-MCP_ALT  TTG-DEF 
7a  Data Available and TC Type (Horiz)  Fly-by  TF and Fly-by  Course to Fix  TF and Fly-by 
7b  TC Latitude  Estimate  LatitudeABC  Estimate  LatitudeDEF 
7c  TC Longitude  Estimate  LongitudeABC  Estimate  LongitudeDEF 
7d  Turn Radius  Intercept Radius  RadiusABC  X  RadiusDEF 
7e  Track to TCP  Current Track  090  120  120 
7f  Track from TCP  090  120  X  Track from DEF 
7g  (Reserved)  *  *  *  * 
7h  Command/Planned (Horizontal)  Command  Command  Command  Command 
8a  Data Available and TC Type (Vertical)  Estimate  Estimate  Target Altitude  Target Altitude 
　
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