In the case of a Member who is a Former Weartech Plan Participant, Disability means the inability to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment that can be expected to result in death or has lasted or can be expected to last for a continuous period of not less than twelve months. The permanence and degree of such impairment must be supported by medical evidence satisfactory to the Administrative Committee. In the case of all other Members, a Member shall be considered to have incurred a Disability if he is eligible for and receives disability insurance benefits under the Federal Social Security Act. A Former Weartech Plan Participant who is eligible for and receives disability insurance benefits under the Federal Social Security Act shall be deemed to have incurred a Disability. A Member who incurs a Disability is “Disabled”.