I got my FBI Clearance earlier this year. You need to go to the FBI website and print out a fingerprint form and credit card payment form. He can finger print himself at home. Just do many copies of the finger print even as much as ten so that at least one of the forms is well printed. This is because it takes up to 3 months to get to your turn and you don't want to be told the forms were invalid after 3 months. He should send the documents via courier to the address on their website and just wait it out unfortunately. He will be required to provide a US address to send the report to as they do not mail outside the US. You can then ask your US contact to send to AVO if they require the original copies. I hope it doesn't take a long time for him to get it. In the mean time, you can submit other documents to AVO and a letter explaining that you have applied for the FBI Clearance and maybe evidence of the applicatin.
@peg204