Revision Control of AS9100 Quality Manual

My Answer: The revision of a document is maintained with that document, so in your case your quality manual should go from Rev K to Rev L. This is not dependant on any outside information or documents that cause the change, so it in not relevant that AS9100 has changed to Rev D. The only reason you would create a Rev A document is if you deleted the current quality manual document and started with a new document number for your AS9100 Rev D quality manual. If you do this you may lose the link to the previous manual though, so it is not recommended.

If you want to know more see this blog article on configuration management: https://advisera.com/9100academy/blog/2017/05/08/understanding-configuration-management-in-as9100-rev-d/