SSR Identification 02b Flashcards
Define Radar contact
The situation that exists when the Radar position symbol of a particular aircraft is seen and identified on the situational display
SSR Identification: The act of correlating a particular position indication with a specific target by means of laid down procedure. Is it possible to achieve identification and validation simultaneously?
Yes
Define Verification
A check to confirm that the aircraft’s Mode C read out is accurate within agreed parameters. These are strict guidelines concerning the use of Mode C data which vary according to whether the read out is verified or not.
Define correlation
Means of a radar processor, SSR data, enabling a code/Callsign conversion to take place. Unless correct validation procedures are carried out, the resulting correlation could give rise to incorrect data being displayed.
Mode A is used identify aircraft. True or False?
True
Following identification, outside controlled airspace, the controller shall inform the pilot that his aircraft has been identified. It is no longer required to pass position to the pilot unless the controller considers it necessary.
T
What is the basic SSR identification process?
1) Observing compliance with instruction to set a 4 digit code (SQK)
2) Recognising a validated 4 digit code
Code/Callsign conversion procedures may also be used if code/Call sign paring confirmed.
3) Observing an IDENT feature when it has been requested.
What are the 2 cautions for SSR Identification?
1) Mis-ident due to simultaneous requests to ident.
2) Ident cannot be used for a/c displaying a conspicuity code
If you allocate a squawk you must validate and verify it!
True
What is validation?
The task of checking that the correct code has been selected by the pilot and is shown on the screen.
Name the 3 things to do when validating a squawk
1) Instruct a/c to sqk assigned code code and observe the correct numbers appear.
2) Instruct the a/c to sqk ident and simultaneously checking that the code numbers are associated with radar return
3) Matching a preciously identified primary Radar return with the assigned code for the flight.
If the observed readout does not correlate with assigned code, Instruct pilot to reset the code.
True
If an error persists the ATCO should Instruct the pilot to sqk?
A000
If an error still exists, Instruct pilot to switch off transponder
True
A code may be deemed validated:
When the code set can be recognised by the code assignment plan to have been assigned by an ATC unit capable of validating the code, providing the code has not been notified as being corrupt.
Mode C can be assumed to have been verified if associated with a deemed validated Mode A. True or False?
True
Verification of Mode C may be achieved with assistance of from another ATSU. True or False?
True.
If in error of Verification of Mode C what should be requested?
- The pilot to “check altimeter setting and confirm level”
-If still in error (Verification of Mode C) what shall the ATCO do?
“Stop sqk Altitude, wrong indication”
“SQK 0000” indicate a data error
1) Maintaining an assigned level. Mode C readout indicates +/- 200ft from that level in RVSM (FL290-410) +/-300ft in other airspace, unless the ATS authority specify smaller (not less than +/- 200ft)
T
2) Vacated a level; when instructed to climb or descend Mode C readout shows a change of more than 300ft (400ft in the UK) from the level, and is continuing in the anticipated direction.
T
Passing through a level in the climb or descent Mode C readout shows the level has been passed by more than 300ft and is continuing in required direction.
T
Reached assigned level.
Three successive Mode C readouts or 15 seconds (whichever the greater) indicate the appropriate tolerance as in 1.
T
Transfer of identification shall be effected by one of the following 7 methods:
1) Designation by automated means, provided that only one position indication is indicated with no possible doubt.
2) Notification of the aircraft’s discrete SSR code or aircraft address
3) Notification that the a/c is SSR Mode S/ ADS-B equipped with an a/c ident feature when Mode S/ADS-B coverage is available
4) Direct Designation (pointing with the finger) of the position indication, if the two situation displays are adjacent.
5) Designation by Reference to bearing and distance from a geographical position or nav facility, together with the track of observed position indication if the route of the aircraft is not known to both controllers.
6) Instructing an aircraft to change SSR code by the transferring controller and observation of the change by accepting controller.
7) Issuance of an instruction to the aircraft by the transferring controller to SQK ident and observation of this response by the accepting controller.
An aircraft should be informed of its position in the following circumstances:
(5 things)
1) upon identification
2) when the pilot requests
3) a pilot’s Estimate differs significantly
4) when the pilot is resuming own navigation after Vectoring if diverted from previous route
5) Immediately before termination of ATS Surveillance-service. If A/C deviates from intended route.
An aircraft should be given position Information upon identification except when the identification is established:
(3 items)
1) Based on Pilot’s report of position or within 1nm of the runway upon departure.
2) Use of ADS-B/SSR Mode S ident or assigned discrete SSR code.
3) Transfer of identification
Position information shall be passed to aircraft in one of the following forms:
(5 things)
1) Well known geographical position
2) Magnetic Track and distance to a significant point/ Nav aid/ approach aid
3) Direction and distance from a known position
4) Distance to touchdown (a/c on final)
5) Distance/direction form centre line of ATS Route
Define SSR Identification
The act of correlating a particular position indication with a specific target by means of laid down procedure.
