TM 9-2320-209-20-3-4 b. Removal. FRAME 1 1. Using screwdriver, loosen two screws in two clamps (1). Pull ram air duct (2) and heater outlet duct (3) from heater assembly (4). 2. Unplug heater motor electrical cable connector (5). 3. Using wrenches, unscrew and take off four screws and lockwashers (6) and nuts (7). Take heater assembly (4) from heater support (8). END OF TASK 23-2