TM 9-2320-209-34-2-3 FRAME 3 1. Test air pressurizing system with air system leak test. Refer to TM 9-2320-209-20. 2. Turn off engine. Refer to General Operating Procedures, TM 9-2320-209-10. 3. Take out flywheel housing drain plug (1) and put it into storage boss hole (2). NOTE Follow-on Maintenance Action Required: Close hood. Refer to Engine Equipment General Maintenance, TM 9-2320-209-10. END OF TASK 21-146