WK,
Because I was never a Chinook avionics tech I cannot answer your question however Master of None in posts #3313 and #3326 DID answer your question and qualified his answer with "
As someone who has operated and instructed on the RAF Chinook HC2" but you chose to ignore him as is your want.
Why you continue to ask questions then ignore the answers given, even when they come from such experts in their field is beyond me
