ACC PROCEDURES SEPA REVIEWER

Question 1

LATERAL SEPARATION: VOR

Answer 1

both A/C established on radials diverging by

at least 15 degrees

and at least 1A/C is at a distance of 15NM or more from the facility

Question 2

LATERAL SEPARATION: NDB

Answer 2

both A/C are established on tracks TO OR FROM the NDB which are diverging by

at least 30 degrees

and at least 1 A/C is at a distance of 15 NM or more from the facility

Question 3

LATERAL SEPARATION: GNSS/GNSS

Answer 3

each A/C is confirmed to be established on a track with 0 offset between 2 waypoints
and at least 1 A/C is at a min. distance from a common point

Question 4

LATERAL SEPARATION: VOR/GNSS

Answer 4

the A/C using VOR is established on a radial to or from the VOR

and the other A/C using GNSS is confirmed to be established on a track with 0 offset between 2 waypoints and

at least 1A/C is at a minimum distance from a common point

Question 5

LONGITUDINAL (TIME)
A/C Maintaining Same Level

Same Track
15 minutes

Answer 5

if without NAVAID

Question 6

LONGITUDINAL (TIME)
A/C Maintaining Same Level

Same Track
10 minutes

Answer 6

if NAVAID permit frequent determination of position and speed

Question 7

LONGITUDINAL (TIME)
A/C Maintaining Same Level

Same Track
5 minutes for the ff. cases

a) between aircraft that have departed from the same aerodrome
b) between en-route aircraft that have reported over the same exact significant point
c) between departing and en-route aircraft

Answer 7

provided that in each case the preceding aircraft is maintaining a TAS of 20 kt or more faster than succeeding aircraft

Question 8

LONGITUDINAL (TIME)
A/C Maintaining Same Level

Same Track
3 minutes for the ff. cases

a) between aircraft that have departed from the same aerodrome
b) between en-route aircraft that have reported over the same exact significant point
c) between departing and en-route aircraft

Answer 8

provided that in each case the preceding aircraft is maintaining a TAS of 40 kt or more faster than succeeding aircraft

Question 9

LONGITUDINAL (TIME)
A/C Maintaining Same Level

Crossing Track
15 minutes

Answer 9

at point of intersection of tracks

Question 10

LONGITUDINAL (TIME)
A/C Maintaining Same Level

Crossing Track
10 minutes

Answer 10

if navigation aids permit frequent determination of position and speed

Question 11

LONGITUDINAL (TIME)
A/C Climbing/Descending

Same Track
15 minutes

Answer 11

While vertical separation does not exist

Question 12

LONGITUDINAL (TIME)
A/C Climbing/Descending

Same Track
10 minutes

Answer 12

while vertical separation does not exist, provided that such separation is authorized only where
ground-based navigation aids or GNSS permit frequent determination of position and speed

Question 13

LONGITUDINAL (TIME)
A/C Climbing/Descending

Same Track
5 minutes

Answer 13

while vertical separation does not exist

provided that:
a) level change is commenced within 10 minutes of the time the second aircraft has reported over a
common point
b) when issuing the clearance through third party communication or CPDLC a restriction shall be added to the clearance to ensure that the 10-minute condition is satisfied

Question 14

LONGITUDINAL (TIME)
A/C Climbing/Descending

Crossing Track
15 minutes

Answer 14

while vertical separation does not exist

Question 15

LONGITUDINAL (TIME)
A/C Climbing/Descending

Crossing Track
10 minutes

Answer 15

while vertical separation does not exist if navigation aids permit frequent determination of position
and speed

Question 16

LONGITUDINAL (TIME)
A/C Climbing/Descending

Reciprocal Track
10 minutes

Answer 16

Vertical separation shall be provided for at least ten minutes prior to and after the time the aircraft are estimated to pass, or are estimated to have passed

Question 17

LONGITUDINAL (DME)
A/C Same Level

Same Track
20NM

Answer 17

provided
1) each aircraft utilizes:

a. the same “on-track” DME station when both aircraft are utilizing DME
b. an “on-track” DME station and a collocated waypoint when one aircraft is utilizing DME and the other is utilizing GNSS
c. the same waypoint when both aircraft are utilizing GNSS

2) separation is checked by obtaining simultaneous DME and/or GNSS readings from the aircraft at frequent intervals to ensure that the minimum will not be infringed

Question 18

LONGITUDINAL (DME)
A/C Same Level

Same Track
10NM

Answer 18

provided
1) the leading aircraft maintains a true airspeed of 20 kt or more faster than the succeeding aircraft

2) each aircraft utilizes:

a. the same “on-track” DME station when both aircraft are utilizing DME
b. an “on-track” DME station and a collocated waypoint when one aircraft is utilizing DME and the other is utilizing GNSS
c. the same waypoint when both aircraft are utilizing GNSS

3) separation is checked by obtaining simultaneous DME and/or GNSS readings from the aircraft at frequent intervals to ensure that the minimum will not be infringed

Question 19

LONGITUDINAL (DME)
A/C Same Level

Crossing Tracks
20NM

Answer 19

provided each aircraft reports distance from the DME station and/or collocated waypoint or same waypoint located at the crossing point of the tracks and that the relative angle between the tracks is less than 90 degrees

1) each aircraft utilizes:

a. the same “on-track” DME station when both aircraft are utilizing DME
b. an “on-track” DME station and a collocated waypoint when one aircraft is utilizing DME and the other is utilizing GNSS
c. the same waypoint when both aircraft are utilizing GNSS

2) separation is checked by obtaining simultaneous DME and/or GNSS readings from the aircraft at frequent intervals to ensure that the minimum will not be infringed

Question 20

LONGITUDINAL (DME)
A/C Same Level

Crossing Tracks
10NM

Answer 20

provided each aircraft reports distance from the DME station and/or collocated waypoint or same waypoint located at the crossing point of the tracks and that the relative angle between the tracks is less than 90 degrees

1) the leading aircraft maintains a true airspeed of 20 kt or more faster than the succeeding aircraft

2) each aircraft utilizes:

a. the same “on-track” DME station when both aircraft are utilizing DME
b. an “on-track” DME station and a collocated waypoint when one aircraft is utilizing DME and the other is utilizing GNSS
c. the same waypoint when both aircraft are utilizing GNSS

3) separation is checked by obtaining simultaneous DME and/or GNSS readings from the aircraft at frequent intervals to ensure that the minimum will not be infringed

Question 21

LONGITUDINAL (DME)
A/C Climbing/Descending

Same Track
10NM

Answer 21

provided each aircraft utilizes:

1) each aircraft utilizes:

a. the same “on-track” DME station when both aircraft are utilizing DME
b. an “on-track” DME station and a collocated waypoint when one aircraft is utilizing DME and the other is utilizing GNSS
c. the same waypoint when both aircraft are utilizing GNSS

2) one aircraft maintains a level while vertical separation does not exist

3)separation is established by obtaining simultaneous DME and/or GNSS readings from the aircraft

Question 22

LONGITUDINAL (DME)
A/C Climbing/Descending

Reciprocal Track
10NM

Answer 22

Aircraft utilizing on-track DME and/or collocated waypoint or same waypoint may be cleared to climb or descend through the levels occupied by other aircraft utilizing on-track DME and/or collocated waypoint or same waypoint, provided that it has been positively established that the aircraft have passed each other and are at least 10 NM apart, or such other value as prescribed by the appropriate ATS authority