GUIDANCE FOR PILOTS TO AVOID UNSTABLE APPROACHES
Maintain a mental picture of the required descent profile.
Request distance updates from ATC if required.
Advise ATC as soon as possible if descent is required or additional track miles are needed, to execute a stable approach.
The sooner ATC knows, the greater is the probability that the request can be accommodated.
Be aware of published local ATC procedures/airspace restrictions that impact the approach.
Airspace constraints may result in route and altitude restrictions.
As far as possible, minimise differences (ATC cannot be aware of all the variables e.g. aircraft performance, airline SOPs, etc.).
When departing, Tell ATC if it is likely that further time will be needed on the runway, prior accepting a clearance to enter the runway.