ATC---QB---UT2
5 Marks Questions.
1.Mention the objectives of RADAR services.
A:
• For Improving airspace utilization
• For Reducing flight delays;
• For Facilitating direct routings and more optimum flight profiles
• For Enhancing safety
2.Define:
a) PSR
A: Primary surveillance radar (PSR) transmits a high-power signal, some of which is reflected by the
aircraft back to the radar. The radar determines the aircraft’s position based on the elapsed time
between signal transmission and reception of the signal’s reflection (range) and the antenna position
(bearing).
b)SSR
A: Secondary surveillance radar (SSR) consists of two main elements, a ground-based
interrogator/receiver and an aircraft transponder. The transponder responds to interrogations from the
ground station, enabling the aircraft’s identity, range and bearing from the ground station to be
determined.
3.Mention the types of Non-RADAR separation.
A:
1.Vertical separation
2. Longitudinal separation
3. Lateral separation
4. Geographical separation
5. Omni Track Separation
6. Visual separation
4. Mention the important Co-Ordination zones.
A:
1. Between ATC Centres.
2. Between Area Control Service and Approach Control Service.
3. Between Approach Control Service and Aerodrome control Service.
4. Between ATC and Military service.
5. Between Met and ATC.
, 5.Define Aerodrome Data.
A: AERODROME DATA: ICAO Annex 15(Aeronautical Information Services), Chapter 3
Aerodrome reporting is the notification of changes to the published aerodrome information or any other
occurrences or emergencies affecting the availability of the aerodrome and safety of aircraft using the
aerodrome. ... Aerodrome Information refers to data on aerodromes and their environs.
7. Write the contents of ICAO DOC 4444.
A:
ICAO DOC 4444 consists of RADAR identification process.
What is radar identification?
Radar identification is “the process of ascertaining that an observed radar target is the radar return from
a particular aircraft.” In other words, radar identification is confirmation that an observed target is truly
the desired aircraft (or an aircraft at all).
It used in frequent performance checks.
Identification status
An aircraft must be informed upon initial radar contact----By ATC---That the aircraft is identified.
Description
Before a radar service may be commenced, it is necessary to establish the identity of aircraft under
observation.
8.Define ARC.
Is defined as "the minimum field length required for take-off at maximum certificated take-off mass, at
sea level, in International Standard Atmosphere conditions in still air and with zero runway slope as
documented in the Aircraft Flight Manual (AFM) or equivalent document.
Eg: If the aeroplane field length is given as 800m, that means that the aeroplane/aircraft needs
minimum of 800m runway length for takeoff.
9.Mention the parameters used for arriving at the ARC.
A: Following are used to arrive at the ARC:
Aeroplane Reference Field Length-- ARFL
Wing Span-- WS and
Outer Main Gear Wheel Span-- OMGWS.
10. Define ARP.
A:
• An airport (or aerodrome)reference point (ARP) is the center point of an airport , located at the
geometric center of all the usable runways.
• The position of the aerodrome reference point shall be measured and reported to the
Aeronautical Information Services (AIS)authority in degrees, minutes and seconds.
5 Marks Questions.
1.Mention the objectives of RADAR services.
A:
• For Improving airspace utilization
• For Reducing flight delays;
• For Facilitating direct routings and more optimum flight profiles
• For Enhancing safety
2.Define:
a) PSR
A: Primary surveillance radar (PSR) transmits a high-power signal, some of which is reflected by the
aircraft back to the radar. The radar determines the aircraft’s position based on the elapsed time
between signal transmission and reception of the signal’s reflection (range) and the antenna position
(bearing).
b)SSR
A: Secondary surveillance radar (SSR) consists of two main elements, a ground-based
interrogator/receiver and an aircraft transponder. The transponder responds to interrogations from the
ground station, enabling the aircraft’s identity, range and bearing from the ground station to be
determined.
3.Mention the types of Non-RADAR separation.
A:
1.Vertical separation
2. Longitudinal separation
3. Lateral separation
4. Geographical separation
5. Omni Track Separation
6. Visual separation
4. Mention the important Co-Ordination zones.
A:
1. Between ATC Centres.
2. Between Area Control Service and Approach Control Service.
3. Between Approach Control Service and Aerodrome control Service.
4. Between ATC and Military service.
5. Between Met and ATC.
, 5.Define Aerodrome Data.
A: AERODROME DATA: ICAO Annex 15(Aeronautical Information Services), Chapter 3
Aerodrome reporting is the notification of changes to the published aerodrome information or any other
occurrences or emergencies affecting the availability of the aerodrome and safety of aircraft using the
aerodrome. ... Aerodrome Information refers to data on aerodromes and their environs.
7. Write the contents of ICAO DOC 4444.
A:
ICAO DOC 4444 consists of RADAR identification process.
What is radar identification?
Radar identification is “the process of ascertaining that an observed radar target is the radar return from
a particular aircraft.” In other words, radar identification is confirmation that an observed target is truly
the desired aircraft (or an aircraft at all).
It used in frequent performance checks.
Identification status
An aircraft must be informed upon initial radar contact----By ATC---That the aircraft is identified.
Description
Before a radar service may be commenced, it is necessary to establish the identity of aircraft under
observation.
8.Define ARC.
Is defined as "the minimum field length required for take-off at maximum certificated take-off mass, at
sea level, in International Standard Atmosphere conditions in still air and with zero runway slope as
documented in the Aircraft Flight Manual (AFM) or equivalent document.
Eg: If the aeroplane field length is given as 800m, that means that the aeroplane/aircraft needs
minimum of 800m runway length for takeoff.
9.Mention the parameters used for arriving at the ARC.
A: Following are used to arrive at the ARC:
Aeroplane Reference Field Length-- ARFL
Wing Span-- WS and
Outer Main Gear Wheel Span-- OMGWS.
10. Define ARP.
A:
• An airport (or aerodrome)reference point (ARP) is the center point of an airport , located at the
geometric center of all the usable runways.
• The position of the aerodrome reference point shall be measured and reported to the
Aeronautical Information Services (AIS)authority in degrees, minutes and seconds.
