VENTILATION SYSTEM – CONTROLS AND INDICATORS
1 VENT CREW rotary knob
• OFF ................. pilot and copilot flapper valves are closed
(no airflow)
• ON ................... pilot and copilot flapper valves are open
(ram airflow)
• FAN LOW ........ pilot and copilot flapper valves are open
and electrical fan operates at low speed
(forced airflow)
• FAN HIGH ....... pilot and copilot flapper valves are open
and electrical fan operates at high speed
(forced airflow)
2 VENT PAX rotary knob
• OFF ................... cabin flapper valves are closed (no
airflow)
• ON ..................... cabin flapper valves are open (ram
airflow)
• FAN LOW .......... cabin flapper valves are open and
electrical fan operates at low speed
(forced airflow)
• FAN HIGH ......... cabin flapper valves are open and
electrical fan operates at high speed
(forced airflow)
3 VENT CONTR switch
• CREW ....... enables the VENT PAX rotary switch (2)
• PAX ........... enables the VENT rotary switch in the cabin
(optional)
NOTE. If the cabin controller is not installed,
selecting the VENT CONTR switch to PAX
causes the cabin flapper valves to open (ram
airflow) and disables the VENT PAX rotary
switch.