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时间:2011-09-14 15:49来源:蓝天飞行翻译 作者:航空
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8b  TC Altitude  Estimate  Estimate  210  210 
8c  TC Altitude Type  MSL  Flight Level  Flight Level  Flight Level 
8d  (Reserved)  *  *  *  * 
8e  (Reserved)  *  *  *  * 
8f  (Reserved)  *  *  *  * 
8g  Command/Planned (Vertical)  Command  Command  Command  Command 

*Reserved for Future MASPS Revisions
“Estimate”: Element contents filled with FMS lat/long estimates, if available.

The partially equipped aircraft flying the Figure 8 trajectory (Table 7b) has an MCP and FMS. The FMS cannot predict the location of the path intercept and does not provide lateral position for the MCP level off. Target altitude in this case represents the selected altitude provided by the TS report. Since the FMS does not support path intercepts, no TC report is provided for TCP #1 (a blank column is provided for clarity). The possibility of an intermediate horizontal TCP requires all successive horizontal TCPs to be labeled as “planned”. All vertical TCPs are “planned” because the aircraft cannot fully determine next target altitude. For instance, it has no means to determine if an intermediate level off (such as an altitude constraint) will occur between the aircraft’s current position and the MCP level off at FL210. (Note: TTG to MCP level off can be estimated from estimated altitude at ABC, TTG to ABC, and climb rate, if no FMS avionics bus gives a time estimate to MCP level off.)
Table 7b. Trajectory Change Report Elements for Figure 8 (Partially Equipped Aircraft)
#  Contents  No Report for Intercept Point  TC+0 Report Values (TCP 2)  TC+1 Report Values (TCP 3)  TC+2 Report Values (TCP 4) 
4  TC Sequence Number  0  1  2 
5a  TC Cycle Number  0  0  0 
5b  (Reserved)  *  *  * 
6  Time to Go (TTG)  TTG-ABC  TTG -MCP_ALT  TTG-DEF 
7a  Data Available and TC Type (Horiz)  TF and Fly-by  Not Available  TF and Fly-by 
7b  TC Latitude  LatitudeABC  X  LatitudeDEF 
7c  TC Longitude  LongitudeABC  X  LongitudeDEF 
7d  Turn Radius  RadiusABC  X  RadiusDEF 
7e  Track to TCP  090  X  120 
7f  Track from TCP  120  X  Track from DEF 
7g  (Reserved)  *  *  * 
7h  Command/Planned (Horizontal)  Planned  X  Planned 
8a  Data Available and TC Type (Vertical)  Estimate  Target Altitude  Target Altitude 
8b  TC Altitude  Estimate  210  210 
8c  TC Altitude Type  Flight Level  Flight Level  Flight Level 
8d  (Reserved)  *  *  * 
8e  (Reserved)  *  *  * 
8f  (Reserved)  *  *  * 
8g  Command/Planned (Vertical)  Planned  Planned  Planned 

*Reserved for Future MASPS Revisions
“Estimate”: Element contents filled with FMS lat/long estimates, if available.
“X”: Information not available.

The TC report format provides a flexible structure for accommodating aircraft with widely varying navigation and automatic flight equipage. In addition to the partially equipped FMS aircraft represented in Figure 7b, numerous other variations are possible. For example, many RNAV and GPS systems only allow lateral waypoints and have no associated altitude estimate. Capability is also provisioned in the TC report for handling additional TC types in future MASPS revisions. As discussed above, future DO-242 revisions may include the capability to report waypoint constraints. Altitude constraints are likely to benefit a number of applications,4-5,7 and space is allocated for these point types in DO-242A.
 
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