ATM Flashcards
When is wake turbulence separation applied?
When aircraft are using:
- The same runway, whether full length or intermediate
- Parallel runways separated by less than 760m, full or intermediate
- The projected flight path of the aircraft will cross the projected flight path of the first aircraft at the same altitude or less than 1000ft below.
- Crossing runways if the projected flight path of the aircraft will cross the projected flight path of the first aircraft at the same altitude or less than 1000ft below.
- An intermediate departure is as follows:
The second aircraft is departing from: An intermediate part of the same runway or an intermediate part of a parallel runway separated by less than 760m
What are the wake turbulence separations for a/c departing from an intermediate point?
L/M behind heavy= 3 mins
L behind M= 3 mins
L/M behind J= 4 mins
H behind J= 3 mins
ie just add one minute to the normal departure separations
What are the wake turbulence separations for a/c heading in opposite directions?
L/M following H= 2 mins
L following M= 2 mins
L/M following J= 3 mins
- Departing on the opposite runway heading.
- Is landing in the opposite direction on the same runway. or;
- Is landing in the opposite direction on a parallel runway separated by less than 760m
What are the wake turbulence separations for arriving aircraft when using a displaced threshold?
Arr L/M behind a H dep= 2mins
Arr L behind M dep= 2mins
Arr L/M behind J dep= 3 mins
or
Dep L/M behind a H arr= 2mins
Dep L behind a M arr= 2mins
Dep L/M behind J arr= 3mins
If projected flight paths are expected to cross.
What are the wake turbulence separation minima for arriving aircraft for a light landing behind a heavy or medium?
Light landing behind a heavy/medium=3 minutes
What are the wake turbulence separation minima for arriving aircraft for a light landing behind a super?
Light landing behind a super= 4 minutes
What are the wake turbulence separation minima for arriving aircraft for a medium landing behind a heavy?
Medium landing behind a heavy= 2 minutes
What is the wake turbulence separation for a medium landing behind a Super for arriving aircraft?
Medium landing behind a Super= 3 minutes
What are the wake turbulence separation minima for arriving aircraft?
Medium landing behind a Super= 3 minutes
Medium landing behind a heavy= 2 minutes
Light landing behind a super= 4 minutes
Light landing behind a heavy/medium=3 minutes
What are the wake turbulence separations for Departing A/C when not intermediate when a light/ medium is departing behind a super?
L/M behind J= 3 mins
What are the wake turbulence separations for Departing A/C when not intermediate when a light is departing behind a medium?
L behind M= 2mins
What are the wake turbulence separations for Departing A/C when not intermediate when a light or medium aircraft is departing behind a heavy?
L/M behind H= 2 mins
What are the wake turbulence separations for Departing A/C when not intermediate when a heavy is departing behind a super?
H behind J= 2 mins
What are the wake turbulence separations for Departing A/C when not intermediate?
H behind J= 2 mins
L/M behind H= 2 mins
L behind M= 2mins
L/M behind J= 3 mins
What a/c have to carry TCAS?
According to ICAO ACAS II SARPS;
All a/c with a MTOW of more than 5,700kgs or the capacity to carry more than 19 passengers must have ACAS II, currently the only system that meets the specs of this SARP is TCAS II
What is ACAS?
Airborne Collision Avoidance System (ACAS) An aircraft system based on SSR transponder signals which operates independently of ground based equipment to provide advice to the pilot on potential conflicting traffic that are equipped with SSR transponders.
TCAS II (v7.1)
What is the latest version of TCAS?
TCAS II (v7.1)
How does TCAS work?
TCAS II uses range and altitude data obtained by interrogating other aircraft transponders to determine the possibility of collision (the bubble around the aircraft). TCAS II is also able to present bearing information of aircraft intruding into your airspace (the bubble), but uses this information on the display only to assist in visual acquisition of an intruder.
When range and altitude of an intruder are computed and a collision risk is predicted, TCAS II will declare the intruder a “threat” and give manoeuvre advice in visual and aural form. Avoidance manoeuvres using TCAS II are in the vertical plane only. Bearing information produced by TCAS II does not possess the accuracy necessary for determining horizontal avoidance manoeuvres.
TCAS relies on a functioning transponder as all functions use SSR data!!
What transponder modes does TCAS use?
Mode A/C Transponders Give both Traffic Advisory and Resolution Advisory, but only if Mode C available but any manoeuvre may not be in the logical sense.
Mode S Transponders - communicate’ with each other and ‘agree’ a course of action.
Where is the TCAS data displayed?
Vertical speed indicator visual display
What would you expect a pilot to do on receipt of a TA?
Nothing as of yet, they may request specific traffic information on the intruder and prepare for possible RA (heightened alert)
What must pilots do on receipt of an RA?
Respond immediately to the instructions (unless this would compromise safety) doing only the minimum necessary to resolve the confliction. The pilot shall advise ATC ASAP and return to previous clearance once clear of conflict.
What are the level limitations associated with TCAS TA’s and RA’s?
Enhanced RA “Increase Descent” is inhibited below 1450ft AGL.
A Descend RA is inhibited below 1100ft AGL.
All RAs inhibited below 1000ft AGL.
All spoken messages inhibited below 500ft AGL.
RAs also inhibited when some GPWS or Windshear warnings are active.
What is the Controller reponse to a pilot experiencing an RA?
Roger
At what point after an RA does the controller become responsible for the standard separation of the a/c experiencing the RA?
once
- The controller acknowledges a report from the flight crew that the aircraft has resumed the current clearance, or;
- The controller acknowledges a report from the flight crew that the aircraft is resuming he current clearance and issues an alternative clearance which is acknowledged by the flight crew.
Once off of an operational position what must a controller do in response to an RA?
File a MOR report
What are the visual display symbols associated with TCAS?
What is the maximum time before CPA that TCAS will issue an TA
25 seconds
600ft
What is the maximum time before CPA that TCAS will issue an RA?
40 seconds
850ft
What should you do if a pilot reports a GPWS or TAWS manoeuvre?
Do not interfere until pilot says he has completed the maneouvre, transmit the pressure setting when appropriate to ensure they have the correct one.
Define an aerodrome control tower?
A unit established to provide air traffic control service to aerodrome traffic
Define aerodrome traffic
All traffic on the manoeuvring area of an aerodrome and all aircraft flying in the vicinity of an aerodrome
Define Air Traffic
All aircraft in flight or operating on the manoeuvring area of an aerodrome
What are the functions of aerodrome control towers?
shall issue
Information and clearances to aircraft under their control to achieve a safe, orderly and expeditious flow of air traffic on and in the vicinity of an aerodrome with the object of preventing collisions between;
- A/C Flying within the designated area of responsibility of the control tower, including aerodrome traffic
- A/C operating on the manoeuvring area
- A/c landing and taking-off
- A/c and vehicles operating on the manoeuvring area
What shall Aerodrome controllers do?
maintain a continous watch on all flight operations on and in the vicinity of an aerodrome as well as vehicles and personnel on the manoeuvring area.
By visual observation aided in low vis conditions by an ATS surveillance system when available.
What are the responsiblities of the aerodrome controller?
Operations on the runway and a/c flying within the area of responsibility of the tower
What are the responsibilities of the ground controller?
For traffic on the manoeuvring area with the exception of the runways
What are the responsibilities of the clearance delivery position?
For delivery of start up and ATC clearances to departing IFR flights
How are aircraft categorised with regards to reduced runway separation minima?
Cat 1
-single-engine propeller aircraft with a maximum certificated take-off mass of 2000 kg or less.
Cat 2
- single-engine propeller aircraft with a maximum certificated take-off mass of more than 2000 kg but less that 7000 kg; and
- twin-engine propeller aircraft with a maximum certificated take-off mass of less than 7000 kg.
Cat 3
-All other a/c
What are the reduced runway separation minima for a/c landing after?
- A succeeding landing Category 1 aircraft may cross the runway threshold when the preceding aircraft is a Category 1 or 2 aircraft which either:
i) has landed and passed a point at least 600 m from the threshold of the runway, is in motion and will vacate the runway without back-tracking; or
ii) is airborne and has passed a point at least 600 m from the threshold of the runway; - A succeeding landing Category 2 aircraft may cross the runway threshold when the preceding aircraft is a Category 1 or 2 aircraft which either:
i) has landed and has passed a point at least 1500 m from the threshold of the runway, is in motion and will vacate the runway without back-tracking; or
ii) is airborne and has passed a point at least 1500 m from the threshold of the runway; - A succeeding landing aircraft may cross the runway threshold when a preceding Category 3 aircraft:
i) has landed and has passed a point at least 2400 m from the threshold of the runway, is in motion and will vacate the runway without back-tracking; or
ii) is airborne and has passed a point at least 2400 m from the threshold of the runway;
* In any event each runway will have its own minima published in MATS 2 and these are the absolute minimum*
What are the reduced runway separation minima for a/c departing behind another departure?
- a Category 1 aircraft may be cleared for take-off when the preceding departing aircraft is a Category 1 or 2 aircraft which is airborne and has passed a point at least 600 m from the position of the succeeding aircraft;
- a Category 2 aircraft may be cleared for take-off when the preceding departing aircraft is a Category 1 or 2 aircraft which is airborne and has passed a point at least 1,500 m from the position of the succeeding aircraft; and
- an aircraft may be cleared for take-off when a preceding departing Category 3 aircraft is airborne and has passed a point at least 2,400 m from the position of the succeeding aircraft.
* Note each runway will have its own minima and these are the absolute minimum*
Consideration should be given to increased separation between high performance single-engine aircraft and preceding Category 1 or 2 aircraft.
What is an alerting service?
A service provided for notifying appropriate organisations regarding aircraft in need of SAR aid and assisting such organisation as required.