It just can't be the ONLY approach available at that alternate.

Actually, it can... just not at the time of filing. If your alternate
has another approach (say an ILS), making it legal for filing as an
alternate, and when things go south, their ILS also dies, you can still
legally FLY their GPS approach, or an approach requring NDB or DME
(except an NDB approach). To fly their NDB approach you'd need the
emergency authority.

Jose
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