Originally Posted by
P160
When originally installed, the glideslope at LCA and Plymouth were commisioned at 7.5 degrees, the DHC Dash 6 was the only type certified to operate this angle of approach. But with production of this aircraft ceased trials were done to certify other a/c types to operate at 5.5 degrees. I'm not sure when the changeover took place but LCA operated at 7.5 deg for quite a few years from its opening date in the late 80's.
Interesting - though I think you mean the 50-seat Dash 7s (DHC-7) of Brymon and London City Airways rather than the Dash 6 (DHC-6 Twin Otter).
LCY wouldn't have been viable if only the 19-seat Twotter had been able to operate there.