November 3, 2012, is the date that operators are required to be in compliance of AD 2010-07-02. It addresses possible erroneous glide slope or localizer display indications.
General Electric Service Bulletin (SB) CF34-72-0252 replaces the #5 bearing that was introduced on newer production engines, starting with engine S/N 950333, or with the incorporation of SB 72-0176.
Insects on the windshield can be dealt with, but in the pitot static system they can be truly maddening. Bugs, like birds, can build a nest overnight.
To effectively troubleshoot an aircraft autopilot, it's helpful to first understand how the autopilot system works.