Bell OH-58A Technical Manual page 251

1.
Vent and Defog Control
Heat Control
2.
Heat Control Cable
3.
Bleed Air Tube
4.
Mixing Valve
5.
Plenum
6.
Remote Sensor
7.
Fresh Air Inlet
8.
Post Plenum
9.
10. Air Distribution Valves
Heating and Ventilating System (Bleed Air) A Model
Figure 15-2.
ENVIRONMENTAL CONTROL SYSTEM
Windshield Defog Nozzle
11.
Plenum Drain
12.
Plenum Valve Assembly
13.
14. Ventilating and Defogging Blower
Ram Air Intake Grill
15.
16. Air Distribution Vents
Coupling
17.
18. Clamp
19.
Noise Filter
Tube
20.
TM 55-1520-228-BD
15-3