- if lack of quorum of permanent judges to hold or continue session of SC, CJI may appoint an HC judge as an ad hoc judge of SC for temporary period
- only after consultation of CJ of HC concerned
- if workload high, at any time, CJI can request a retired judge of SC or retired judge of HC (who is duly qualified for appt as a judge of SC), to act as a judge of SC for temporary period
- only w/ previous consent of President
- ad hoc appt to HC is made by President in consultation w/ collegium