Low approach clearance - minimum altitude included?

[manitou]

So, as I put in the title:
Do you specifiy some kind of altitude minimum when issuing low approach (or low pass) clearance?

For example: cleared for low approach rwy23, not below 500 feet, qnh1013, wind xx.

Or you think it is unnecesary?!

What does ICAO or any other national document say about this topic?

[Guy D'ageradar]

It's a long time since I worked in tower, but it used to be that if there was a vehicle/aircarft/personnel on the runway, restriction was minimum 200ft agl, otherwise, no restriction at all. Can't confirm for now though.

[vintage ATCO]

In the UK the minimum height is 400ft aal if there is another aircraft/vehicle/personnel on the runway. This follows an incident at Bedford Thurleigh many years ago when a Trident (I think), carrying out an intentional go-around, clipped the top of the tail of a Comet which was lined up on the runway. If there is no requirement for it then I don't specify a limit.

[chevvron]

400ft agl is the standard empahsising it's agl rather than QNH; as VATCO says it was brought in after the Trident v Comet incident at RAE Bedford