Exam from previous Flashcards
What are the components of a radar system?
Aerial.
Transmitter.
Receiver.
Display.
What is the radar process?
- The radar sends out a signal pulse. The energy is not transmitted continuously but is sent out in the form of pulses.
- The radar switches into receive mode.
- The pulse either strikes an object or disappears into space never to be seen again.
- The reflection from the target is received by the radar, processed, and displayed as an undefined object. The strength of the returned pulse will depend on the reflective properties of the target(the size of the target and the material that it is made from).
What is a radar fade area?
These may exist where there are gaps in the radar coverage. They may also result from shadowing by hills or obstructions in the line of sight between a particular target and the radar aerial.
What is the radar overhead?
The blind area that exists overhead a radar site
What influences the size of the radar overhead?
- Antenna design.
- Antenna tilt angle.
What determines the ability for a radar to detect an aircraft?
- The power of the transmitter.
- The location of the aerial.
- The size and reflective properties of the aircraft.
What are the two main variables that determine whether an aircraft will be detected or not?
The aircraft’s:
- Altitude and,
- Distance from the radar aerial.
What is the height vs range approximation?
10 NM per 1000 ft.
1 NM per 100 ft.
How might you overcome the radar overhead and fade areas?
Use multiple radar sites to cover a particular area (Overlapping coverage)
What are the limitations in the provision of a radar service?
The number of aircraft provided with radar services shall not exceed those that can be handled safely under the prevailing circumstances, taking into account:
- The structural complexity of the area or sector concerned.
- The radar functions to be performed within the control area or sector concerned.
- Assessment of controller workloads and sector capacity.
- Limitations in radar coverage.
- The degree of technical reliability and availability of the main and back-up radar and communications system; and
- The possibility of radar equipment failure or other emergency that would eventually require reverting to back-up facilities and/or non-radar separation.
Pilots will assume a continuous radar service is being provided unitl when?
- They are informed they are out of radar coverage.
- They are informed that a radar service is being terminated.
- They have landed.
- The contact a non-radar unit.
What actions should a controller take if misidentification is suspected? (3 marks)
- Changes of heading should be prescribed or repeated as necessary.
- Additional methods of identification should then be employed until all risk or error in identification is eliminated.
- Assuming that vertical separation is being provided, issue diverging headings to two aircraft in close proximity to allow them to track away from each other and be re-identified.
What actions should a controller take if misidentification has occurred?
- Advise the pilot that radar identification is lost.
- If under radar vectors, instruct the pilot to resume own navigation.
- If terrain clearance is in doubt, climb the aircraft to a safe level and advise the pilot to remain VMC if possible.
- Establish non-radar separation from other known traffic, (e.g. vertical separation).
- Pass essential traffic information if separation from other known traffic does not exist.
- Scan the situation display for RPS/RPI which may be the aircraft concerned and re-establish radar identification.
What are the four methods of establishing primary identification?
- Matching an RPS with an aircraft reporting its own position.
- Observing an aircraft immediately after take-off.
- By radar transfer from another controller.
- Observing a clearly defined change in direction.
What are the provisos when matching an RPS with an aircraft reporting its position?
- The position that the aircraft report is based on must be displayed on the situation display.
- The RPS is seen and its position is consistent with the pilots position report.
- The track of the target is consistent with the route or reported heading of the aircraft.
- The RPS is within 5nm of the reported position of the aircraft.
What are the provisos for Observing a clearly defined change in direction?
- Ensure that the degree of turn is 30° or more and that the new heading is maintained for sufficient time for the turn to be observed, and
- Verify that the movements of not more than one radar target correspond with those of the aircraft concerned.
It is worth pointing out here that there are two possible situation detailed in this rule:
-Where we are telling the pilot to take up a turn of 30 degrees or more
-Where the pilot calls us and reports the execution of a turn of 30 degrees or more.
All the associated provisio’s and cautions apply to both situations
When observing a clearly defined change in direction what shall the controller do?
- Ensure that the degree of turn is 30° or more and that the new heading is maintained for sufficient time for the turn to be observed, and
- Verify that the movements of not more than one radar target correspond with those of the aircraft concerned.
It is worth pointing out here that there are two possible situation detailed in t- Verify that the movements of the aircraft do not correspond with more than one radar position indication; and
- Ensure that the manoeuvres will not carry the aircraft outside the coverage of radar, or the situation display.
(Possibly not be undertaken where route changes normally occur)
How do we pass position information?
- As a well-known geographical position, or
- Magnetic track and distance to a significant point or enroute or approach navigation aid, or
- Bearing (using points of the compass) and distance from a known position, or
- Distance and direction from the centre line of an ATS route, or
- Distance to touchdown if the aircraft is on final approach
Pilots should be informed of their position (Part 1/3)
Upon identification, except when the identification is established:
- Based on the pilot’s position report, or
- Upon departure and the observation is consistent with the aircraft’s time of departure, or
- By use of ADS-B aircraft identification procedures or assigned discrete SSR codes, including recognition of an aircraft’s identification in a radar datablock, and the location of the observed RPS is consistent with the current flight plan or known track of the aircraft, or
- By transfer or radar identification
Pilots should be informed of their position (Part 2/3)
- When requested by the pilot,
- When after querying the pilot’s estimate, the estimate still differs significantly from the radar controller’s estimate based on radar observation of route readout data;
- At intervals when on a radar heading, particularly when an arriving aircraft is being vectored for approach
Pilots should be informed of their position (Part 3/3)
- Prior to reverting to own navigation after radar vectoring except where instructions are given to regain track prior to a navigation aid or waypoint,
- When an aircraft is off track to the extent that is outside the navigation tolerance for the type of navigation aid being used;
- When the pilot is informed that radar identification has been regained following a loss of radar identification
How can you identify an aircraft using secondary radar?
- Recognition of the aircraft identification in an SSR and/or MLAT label/datablock; or
- Recognition of an assigned discrete code, the setting of which has been verified, in an SSR and/or MLAT label/datablock, and
- Direct recognition of the aircraft identification of a Mode S-equipped aircraft in an SSR and/or MLAT label
- Transfer of identification, or
- Observation of compliance with an instruction to set a specific code, or
- Observation of compliance with an instruction to “squawk ident”
- Any primary radar method.
What is the emergency phraseology to get an aircraft to squawk 7700?
“Squawk MAYDAY [CODE SEVEN-SEVEN-ZERO-ZERO]”
What is the phraseology to confrim if an aircraft is squawking 7500?
“Confrim squawking SEVEN FIVE ZERO ZERO?”
What is a more subtle way to get an aircraft to squawk 7500?
Insert the phrase “CHANNEL SEVEN FIVE ZERO ZERO” into any RTF transmission.
What is the squawk code for a general emergency?
7700
What is the squawk code for comms failure?
7600
What is the squawk code for unlawful interference?
7500
IFR flights in AA OCA departing NZ, or inbound or overflying NZ FIR shall squawk?
Code assigned on departure, or last code assigned, or 2000
IFR flights within the NZ FIR shall squawk?
Code assigned or 2000
What code do Fire suppression and reconnaissance (fixed wing and helicopters) squawk?
0111
Who squawks 1200?
Civil VFR aeroplanes other than gliders.
Who squawks 1300?
VFR Gliders and balloons
What do VFR aircraft in GAA’s squawk?
1400
What do civil VFR helicopters squawk?
1500
VFR flights within the Auckland Oceanic FIR squawk?
2000
What do VFR defence fixed wing aircraft squawk?
6000
What do defence VFR helicopters squawk?
6500