I cannot comment on the original question as it is beyond the scope of my knowledge, however, I would be interested in how these Inhibiting procedures are worded, simply, because I have never seen an Ops Manual which allows it.
We all know there is an ICAO and EU OPs regulation stating it must be fitted : 1.665 and it contains the following guidance:
6.3.5
Instructions on inhibition must include a statement that no person may deactivate the GPWS except in accordance with the procedures stated in the Operations Manual. It is essential that this is made clear as there have been accidents in which GPWS had been inhibited in order to silence what were genuine warnings.
Could you cut and paste the wording from your mates manuals please.
KG