Approach Separation - Medium behind Medium

[pitot_noob]

Hey All,

Would appreciate any thoughts on this:


What is the separation between two medium jets on approach?
Now, I dug back into the old ATPL textbooks, which didn't help, as the air law book says that if the aircraft are the same weight, then there is so sep!

However, other people seem to think it is 3nm?
(as opposed to Medium behind a heaving being 5nm)

Thanks for any help!

[FlyingStone]

Separation between medium following medium on ILS approach must be at least 3 NM since medium behind medium doesn't need increased wake turbulence separation.

The following events require increased separation:
- light behind medium (5.0 NM or 3 minutes)
- light behind heavy (6.0 NM or 3 minutes)
- medium behind heavy (5.0 NM or 2 minutes)
- heavy behind heavy (4.0 NM)

And from DOC4444:

6.7.3.4.3 The minimum radar separation to be provided between aircraft established on the ILS localizer course
and/or MLS final approach track shall be:

a) 5.6 km (3.0 NM) between aircraft on the same ILS localizer course or MLS final approach track unless increased longitudinal separation is required due to wake turbulence; and
b) 3.7 km (2.0 NM) between successive aircraft on adjacent ILS localizer courses or MLS final approach tracks.

8.7.3.4.1 The minima set out in 8.7.3.4 shall be applied when:
a) an aircraft is operating directly behind another aircraft at the same altitude or less than 300 m (1 000 ft) below; or
b) both aircraft are using the same runway, or parallel runways separated by less than 760 m (2 500 ft); or

c) an aircraft is crossing behind another aircraft, at the same altitude or less than 300 m

(1 000 ft) below.

[AI101]

It's 3 miles but can be further reduced down to 2.5 miles at certain airports eg. LHR , STN, LGW and so on as long as it has been agreed with the relevant authority

[pitot_noob]

Fantastic guys.

Thank you so much!