TBH given the redundancy I'd be really darned surprised if it was that complex a failure that actually it took out every channel of transmission, including "typing"...Might be that the balloon went up too quickly, so to speak, for the crew to be able to work their way through more obscure options such as HF, perhaps via a phone patch, or ACARS ..Be interested to hear the full story.
Last edited by wiggy; 22nd Jul 2017 at 13:28.