Thanks Tuc. What you say also makes a joke of SI/Chinook/57, which states:
"Electromagnetic Compatibility (EMC). The EMC of the aircraft is not affected"
How did they know, seeing as no EMC test had ever been carried out and a base line established.
I asked the question in order to try and establish if the construction of the DECU box was changed in the late 1990's. The training notes (2006) go to great length to point out that the box is RFI/EMI proof. Was it not before? I do not recall seeing this as a general statement for other LRUs.
DV