Questão jurídica principal
Whether the pension revision under Art. 17 ATSG was justified by a significant improvement in health or earning capacity.
Decisão extraída
No significant change was proven; the prior legal situation remained unchanged, so the revision failed and the quarter pension continued.
Fundamentação extraída
The court found the K.___ expert report persuasive but saw no concrete, decisive improvement compared with the 2005 basis for the pension. Differing medical assessments reflected evaluation differences rather than a material change.