Environmental Control System
Introduction
The Environmental Control System is everything that keeps the cabin comfortable and pressurized for the pilot.
Controls
- Cockpit Pressure Selector Switch
- Console Airflow Lever
- Canopy and Windshield Defrost Lever
- IFF Antenna Selector Switch
- Cockpit Temperature Rheostat
- Cockpit Temperature Master Switch
- Marker Beacon Volume Knob (INOP)
Cockpit Pressure Selector Switch
The Cockpit Pressure Selector Switch has four positions:
| Selection | Description |
|---|---|
| RAM AIR ON | Main system shutoff valve closes, and the emergency ram air valve opens to admit ram air to the cockpit. |
| OFF | Closes the main system shutoff valve, the emergency ram-air valve, and the cockpit dump valve, and the cockpit pressure regulator is set to 2.75 psi. |
| 2.75 PSI | Main system shutoff valve opens to direct air to the cockpit, and air outlets and the emergency ram air valve closes. |
| 5.00 PSI | Main system shutoff valve opens to direct air to the cockpit, and air outlets and the emergency ram air valve closes. |
Note
The OFF position prevents rapid decompression of the cockpit.
Caution
Selecting *RAM AIR ON depressurizes the cockpit.
Cockpit Pressure Schedule
This figure describes how pressure scheduling works:
Console Airflow Lever
Controls the flow of air to the outlets along the console and to the outlet behind the seat. Moving the lever forward increases the airflow, and moving it aft reduces the airflow.
Canopy and Windshield Defrost Lever
Similaly to the Console Airflow Lever, this lever controls the distribution of heat to the canopy and windshield, preventing canopy fogging and condensation during descent.
IFF Antenna Selector Switch
The IFF Antenna Selector Switch has three position:
| Selection | Description |
|---|---|
| TOP | Use only the upper antenna. |
| BOTH | Use both upper and lower antenna. |
| BOTTOM | Use only the lower antenna. |
See also: ARN-72 Tacan
Cockpit Temperature Rheostat
Change the temperature of the cockpit when the Cockpit Temperature Master Switch is set to the AUTO position. It also has a small range that controls pilot suit temperature.
Cockpit Temperature Master Switch
The Cockpit Temperature Master Switch has four positions. Setting this switch to any position except OFF controls cockpit airflow temperature.
| Selection | Description |
|---|---|
| AUTO | Will automatically adjust the temperature of the cockpit. |
| OFF | Will turn the temperature control system off. |
| COLD | Will set the temperature of the cockpit to cool. |
| HOT | Will set the temperature of the cockpit to hot. |
Cockpit Pressure Altitude Indicator
Indicates cockpit pressure.
