Message for Nathan_A_RF

[Conekicker]

You seem to have disabled being able to receive a PM? In answer to your question:

You can put a 622.10 on an 818.4, it is a permitted variant, see S12-28-22, column 4, item 3, which points you back to section 20 and the permitted roundels for inclusion on an 818.4. This is the Working Drawing:

https://assets.publishing.service.gov.u ... p818x4.pdf

Checking the WD webpages though, there's this:
https://assets.publishing.service.gov.u ... 818x4a.pdf

I'd go with the 24 s/w quoted in TSRGD, which trumps WDs.

Edited for accuracy