The PoH or Manual will contain details of defects which may be deferred and what flight conditions are permissible. At our FTO, this is supplemented for local operations and includes details of what defects may be deferred for PPLs,FIs and Students (e.g. U/S stall warner No students). This is good risk management practice and gets round the problem of making decisions on an ad hoc basis, implying to students that there is a carefree attitude toward A/C servicability, whilst still permitting flights to be undertaken safely.