The aircraft used to validate the original procedure was a Navajo, to the best of my knowledge it was not equipped with GPWS. There was and is still no requirement in the certification process to assess GPWS warnings, although it is brought to CASA's attention if one is found to alarm during a flight test. Further investigation usually results until the regulator is satisfied for publication.
The GPWS tests I alluded to in the above post were after the incident.
There has never been an error in a plate??
Advo-cate...did I say that? Has there ever been a procedural error? I would nearly say 100% no. Has anyone ever hit something whilst flying the published IFR procedure? There are quite alot of checks and test flying of procedures before they are let loose and the current rounds of checking are flown by pilots who actively fly in GA and they have to sign the certification.
In answer to your questions, consideration is given to surrounding procedures during the design process to ensure conflicts are minimal.