Test does not cover appropriateness of audio description

Name: Detlev Fischer
Email: fischer@dias.de
Affiliation: DIAS GmbH
Document: TD
Item Number: G166
Part of Item: Tests
Comment Type: technical
Summary of Issue: Test does not cover appropriateness of audio description
Comment (Including rationale for any proposed change):
As it stands, the test in technique G166 only checks whether a link to the audio alternative is provided. It does not check the equivalence of the audio alternative. Testing just for the link is not sufficient

Proposed Change:
Add a second checkpoint #2 for checking whether the audio alternative is adequate.
Both Check #1 and Check #2 must be true.