Use of Wing Tip Strobes when on Runway
We are having a debate about the use of wingtip strobes when on a runway:
Is it a legal requirement to have them illuminated when using a runway for any purpose including crossing or is it just best practice?
I recall an incident at KLAX where a 737 landed on top of an SW4, one of the NTSB recommendations was the mandatory use of wingtip strobes where fitted when using a runway. What we're unsure of is if it is mandatory in the UK