Minimum Radar Separation. 100314 100517

[Jakegoat]

100314:
The minimum radar separation provided between aircraft established on the same localizer course shall be: (plus additional longitudinal separation as required for wake turbulence)

5 NM.
2 NM.
3 NM.
2.5 NM.


100517:
The following minimum radar separation shall be provided between aircraft on the same localizer with additional longitudinal separation as required for wake turbulence:

2.5 NM
5.0 NM
3.0 NM
2.0 NM


FROM ATPLONLINE BANK:

Minimum Radar Separation on final approach. The minimum radar separation provided between aircraft established on the same localizer course shall be: (plus additional longitudinal separation as required for wake turbulence)

5 NM.
3 NM.
2.5 NM.
2 NM.


When taking into account wake turbulence the separation is 5nm, when not taking into account wake it can be reduced to 2.5nm.

1) Is this statement correct? ^
2) Is the atplonline bank simply wrong? or...?
3) Are there anymore questions like this?

Anymore info you can give on this? Is there a tip to remembering these dodgy questions? If it has brackets remember 2.5nm, if not remember 5nm?

Thanks.

[Baz]

Re: Minimum Radar Separation. 100314 100517

Hi,

We have no input to ATPLonline.

Baz

[Jakegoat]

Re: Minimum Radar Separation. 100314 100517

I understand that but their question contradicts the answer to question 100314 doesn't it? So despite the fact that BGS doesn't associate with Atplonline can you at least tell me which answer the examiners are looking for or what the difference between these questions is?

Is it to do with their question mentioning 'on final approach'?

Also if it makes any difference, AviationExam answer this question with "3NM".

Thanks.

[Baz]

Re: Minimum Radar Separation. 100314 100517

Hi,

ICAO Doc 4444:

8.7.3.2 The radar separation minimum in 8.7.3.1 may, if so prescribed by the appropriate ATS authority, be reduced but not below:
(a) 5.6km (3NM) where radar capabilities at a given location so permit; and
(b) 4.6km (2.5NM) between succeeding aircraft which are established on the same final approach track within 18.5km (10NM) of the runway end. A reduced separation minimum of 4.6km (2.5NM) may be applied, provided:
and there follows a list of requirements based on average runway occupancy time, runway contaminants (slush/snow/ice), braking action, radar capability etc..

Baz

[cab825]

Re: Minimum Radar Separation. 100314 100517

I have been watching this thread with interest also.

To confirm Baz, do you agree with the following comments? (I am sure this is tedious but rest assured we learn from this - we will never forget these figures now and I never knew it was within the 10nm of runway end).

Thanks.

Chris

-----------------------

100314:
The minimum radar separation provided between aircraft established on the same localizer course shall be: (plus additional longitudinal separation as required for wake turbulence)

5 NM.
2 NM.
3 NM.
2.5 NM. - Correct

Provided they are are established on the same final approach track within 18.5km (10NM) of the runway end - wake turbulence separation should be added when needed.


100517:
The following minimum radar separation shall be provided between aircraft on the same localizer with additional longitudinal separation as required for wake turbulence:

2.5 NM
5.0 NM – incorrect
3.0 NM
2.0 NM

The min separation is 2.5 (plus additional separation for wake turbulence - and this addition is a time not a distance no?? 2/3 minutes depending on weight category)

FROM ATPLONLINE BANK:

Minimum Radar Separation on final approach. The minimum radar separation provided between aircraft established on the same localizer course shall be: (plus additional longitudinal separation as required for wake turbulence)

5 NM.
3 NM. – incorrect
2.5 NM.
2 NM.

3nm is the separation for any point where radar capabilities at a given location so permit - not when on final approach

[Baz]

Re: Minimum Radar Separation. 100314 100517

Hi,

Q100314: correct as shown.

Q100517: Correct as shown. See table on page 25.24 of BGS notes (paragraph 8.7.3.4 of ICAO Doc 4444) which gives wake turbulence separations in distances and the minimum is 4NM (heavy following heavy) so 5NM is the best on offer.

ATPLonline Q: There was a version of this question where the answers offered were 1NM, 2NM, 3NM or 4NM and in this case the answer would be 3NM.

Baz

[dimitrisxasg]

Hello!
The questions 100314 and 100517 seem to be alike, but slightly changed. The answers are different. Why? What makes these questions different? Plus instead of with?
It seems like we are playing with words....
Can someone answer me?
Thanks in advance!

[John CTKI]

Yes, they are different and you need to pay attention to the differences. They are not written as clearly as I would like but 100314 is without considering wake turbulence and 100517 is with considering wake turbulence. So 100517 will be a larger distance.