Document ID: chunk:federal_register_of_legislation:F2023C00696:body:0:p43
Version: federal_register_of_legislation:F2023C00696
Segment Type: other
Provision Reference: 
Character Range: 140140–143189

and is maintained at FL130. A B737 after departing and climbing through 4,000 FT is required to reach FL140 by 35 DME.
                                                                                                4. A C130 climbing to FL230 reports at 45 TACAN leaving 10,000 FT. An F18 ready for departure is instructed to reach FL240 by 35 TACAN.

10.6.7              Application of Longitudinal Distance Separation

10.6.7.1         Distance based longitudinal separation minima must only be applied when:

(a)         Direct Controller Pilot Communications (DCPC) exist; or

(b)         ATC monitors all distance reports made by the aircraft.
Note: The requirement for DCPC is met by the use of Controller Pilot Datalink Communications (CPDLC).

10.6.7.2         All distance reports must be made with reference to the same DME beacon or waypoint.

10.6.7.3         When applying same direction distance separation, an off-track waypoint or beacon may be used provided the positions of the aircraft relative to the beacon/waypoint are such that the distance readings are together increasing or decreasing.

10.6.7.4         A DME beacon may be taken to be co-sited with a waypoint or the azimuth navigation aid providing tracking guidance only when the DME site is located within 600 m of the waypoint or azimuth aid.

10.6.7.5         Where aircraft have been issued with different route clearances, and the difference in routes would apply during the period when distance separation is required, the leading aircraft must be tracking directly to or from the beacon/waypoint or co-sited navaid.

10.6.7.6         If a mix of DME and LRNS distances is being used:

(a)         LRNS distance information must be based on the coordinates of the en route tracking aid, and not on the location of the DME site; and

(b)         LRNS derived distance may be used for longitudinal separation only when the en route tracking aid and DME are co-sited.

10.6.7.7         Where distance information is required from a specific navigation source, the source must be included in the request (e.g. "REPORT DISTANCE FROM NWN DME", "REPORT GPS DISTANCE FROM BEZZA" or "REPORT RNAV DISTANCE FROM PONAN").

10.6.7.8         During the application of same direction distance minima, the distance between aircraft must be checked at sufficient intervals to ensure that the required separation is maintained. The frequency of these regular distance checks will depend on the performance and disposition of the aircraft, but must be made at intervals not exceeding 30 MIN.

10.6.7.9         When the ATS surveillance system derived distance between the aircraft is less than the sum of the distance required by the procedural separation minimum and the applicable ATS surveillance system separation minimum, a distance check must be made before the first aircraft leaves ATS surveillance system coverage.

10.6.7.10     Separation minima D4, D7 and R3 (change of level) may also be applied between 2 aircraft if:

(a)         the aircraft are confirmed to be