SSR Identification 02b

Question 1

Define Radar contact

Answer 1

The situation that exists when the Radar position symbol of a particular aircraft is seen and identified on the situational display

Question 2

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?

Answer 2

Yes

Question 3

Define Verification

Answer 3

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.

Question 4

Define correlation

Answer 4

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.

Question 5

Mode A is used identify aircraft. True or False?

Answer 5

True

Question 6

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.

Answer 6

T

Question 7

What is the basic SSR identification process?

Answer 7

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.

Question 8

What are the 2 cautions for SSR Identification?

Answer 8

1) Mis-ident due to simultaneous requests to ident.

2) Ident cannot be used for a/c displaying a conspicuity code

Question 9

If you allocate a squawk you must validate and verify it!

Answer 9

True

Question 10

What is validation?

Answer 10

The task of checking that the correct code has been selected by the pilot and is shown on the screen.

Question 11

Name the 3 things to do when validating a squawk

Answer 11

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.

Question 12

If the observed readout does not correlate with assigned code, Instruct pilot to reset the code.

Answer 12

True

Question 13

If an error persists the ATCO should Instruct the pilot to sqk?

Answer 13

A000

Question 14

If an error still exists, Instruct pilot to switch off transponder

Answer 14

True

Question 15

A code may be deemed validated:

Answer 15

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.

Question 16

Mode C can be assumed to have been verified if associated with a deemed validated Mode A. True or False?

Answer 16

True

Question 17

Verification of Mode C may be achieved with assistance of from another ATSU. True or False?

Answer 17

True.

Question 18

If in error of Verification of Mode C what should be requested?

Answer 18

• The pilot to “check altimeter setting and confirm level”

Question 19

-If still in error (Verification of Mode C) what shall the ATCO do?

Answer 19

“Stop sqk Altitude, wrong indication”

“SQK 0000” indicate a data error

Question 20

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)

Answer 20

T

Question 21

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.

Answer 21

T

Question 22

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.

Answer 22

T

Question 23

Reached assigned level.

Three successive Mode C readouts or 15 seconds (whichever the greater) indicate the appropriate tolerance as in 1.

Answer 23

T

Question 24

Transfer of identification shall be effected by one of the following 7 methods:

Answer 24

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.

Question 25

An aircraft should be informed of its position in the following circumstances:
(5 things)

Answer 25

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.

Question 26

An aircraft should be given position Information upon identification except when the identification is established:
(3 items)

Answer 26

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

Question 27

Position information shall be passed to aircraft in one of the following forms:
(5 things)

Answer 27

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

Question 28

Define SSR Identification

Answer 28

The act of correlating a particular position indication with a specific target by means of laid down procedure.