R-11, r. 1 - Regulation under the Act respecting the Teachers Pension Plan

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6. A teacher is physically disabled or mentally incompetent if he suffers from a serious, prolonged pathological condition.
A pathological condition is serious if it makes the teacher totally incapable of performing the work required by his position for an extended period of time.
A pathological condition is prolonged if it will last indefinitely, that is, if it is unlikely that a cure is possible in the present state of medical knowledge.
T.B. 169291, s. 6.