Q400 will not intercept the ILS glideslope before localiser. It is SOP at least in our company to APPR (arming LOC & GS) when cleared to establish on the localiser.
However, if APPR had been selected it is just possible that the localiser was captured (known as LOC*) just as the aircraft passed through the 'bad glideslope' signal referred to in #699, thus the aircraft/autopilot could then pitch up as it apparently did.
(p.s. The autopilot would then disconnect itself at +20 NU)
Last edited by Pontius's Copilot; 19th Feb 2009 at 07:12.