CDA Requirements - UK
 

Many UK airports, especially in and around the London area (including LONDON... Luton).
They require CDA below a certain altitude.

Let's say 5000ft.
What conditions must be met for the CDA?
Minimum V/S? Is there a certain nm or time limit in level flight before busting the CDA?
Stupidly, does the CDA end at G/S capture or until touchdown?

From Heathrow's noise website...

Ends at touchdown.

I believe the 2.5nm leg maximum level flight is standard across the London airports, but different airports measure from different altitudes.

In other words, you can level off for (roughly) 45 seconds at a time, but no longer, and still call it a CDA. :O

In practice it’ll be from the point at which they give you the distance to touchdown. It’s a bit tricky to gauge your required v/s for a CDA if you don’t know how far you are from touchdown.

Figures for CDA compliance from the performance stats for Heathrow's 50 busiest airlines in Oct-Dec 2025:

18 out of 50 airlines: >90% compliance (Green)
27 out of 50 airlines: 70-90% compliance (Amber)
5 out of 50 airlines: <70% compliance (Red)

Best performer for CDAs was Aegean Airlines, bottom placed (of the 50) was Air France.

No stats available for the other 30-40 airlines using LHR.