ATS Surveillance Systems Flashcards
How are Mode C responses used to apply vertical separation?
When SSR is used to assess vertical separation the Mode C responses are to be continually monitored to ensure that the vertical distance is never less than the prescribed minima.
When can Mode C not be used to apply vertical separation?
Vertical separation using Mode C is not applied against aircraft transponding A0000.
What conditions apply to the use of Mode C for minimum vertical separation?
Minimum vertical separation may be applied between verified Mode C transponding aircraft provided the intentions of both aircraft are known to a controller because either:
1) They are under his control
2) They have been coordinated, or
3) They are operating in accordance with established agreements
For both aircraft under a Radar Control Service and aircraft under a Deconfliction Service, what are the vertical separation conditions if aircraft intentions are not known and/or Mode C is unverified?
Aircraft Under Radar Control Service: If the intentions of Mode C transponding aircraft are not known:
1) The minimum separation for IFR flights in Class A-D airspace, and VFR flights in Class B/C airspace, must be increased to 5,000ft, or alternative approved minima within MATS Part 2, and,
2) Unverified Mode C data may be used for separation purposes provided a minimum vertical separation of 5,000ft, or alternative approved minima within MATS Part 2, in Class A-D airspace is maintained. Radar returns, however presented, are not allowed to merge
3) In Class E airspace radar returns, however presented, are not allowed to merge unless the pilot in receipt of traffic information advises that he intends to avoid the other aircraft without ATC assistance.
Aircraft under a Deconfliction Service: If the intentions of the Mode C transponding aircraft are not known, the vertical deconfliction minima must be increased to 3,000ft, and unless the SSR Mode 3A indicates that the Mode C data has been verified, the surveillance returns, however presented, should not merge.
As detailed in MATS Part 1, detail how position information shall be passed to aircraft
Position information shall be passed in one of the following forms:
1) A well-known Geographical position; Bearing (using points of the compass) and distance from a known position
2) Magnetic track and distance to a location displayed on the situation display that is a reporting point, an en-route navigational aid, or an approach aid
3) Latitude and Longitude (by specific units only when authorised in MATS Part 2) or
4) Distance from touchdown if the aircraft is on final approach
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As stated in MATS Part 1, what are the minimum terrain clearance requirements when assigning levels to IFR flights in receipt of a Radar Control Service? Exclude the phases of flight for within the defined approach area and within the Surveillance Minimum Altitude Area.
Within 30 miles of the radar antenna associated with the unit providing the service:
1000 feet above any fixed obstacle within:
1) 5 miles of the aircraft and,
2) 15 miles ahead and 20 degrees either side of the aircrafts track
When the aircraft is within 15 miles of the antenna, and provided an SMAC or approved procedure has been notified, the 5 miles in (1) and the 15 miles in (2) may be reduced to 3 and 10 miles respectively.
Outside the phases above:
1000 feet above any fixed obstacle:
1) which lies within 15 miles of the centreline of any airway, or
2) within 30 miles of the aircraft (for all other flights)
In sections of airways where the base is defined as a flight level, the lowest useable level normally provides not less than 1,500 feet terrain clearance.
