om15 thanks, that's the mod I was thinking of. I seem to remember a 748 that had it incorporated.
I'm pretty sure CF-CSE was the first 748 in Canada, imported by an oil company ..Shell?.. It had an APU in the tail compartment. Air North also operates CF-AGI, the first commercial 748 in Canada, originally owned by Air Gaspe Inc. hence the registration. This would have been about 1972 or 1973.