Is it true that releasing the IDG DISC switchlight after pressing it regains the generator?

• A. False
• B. True
• C. Restart procedure required
• D. Regain is not possible in flight

Answer: (A)

The IDG DISC switchlight is a disconnect control. When you press it, the Integrated Drive Generator is physically disconnected from the electrical system and the switchlight illuminates to show that status. Releasing the switch does not automatically reclose or re-energize the generator—the connection stays open until you perform the proper re-engagement action (such as cycling the generator switch to ON or following the aircraft’s re-engagement procedure after the fault has been cleared). So simply letting go does not “regain” the generator in flight.