Environmental Systems

Question 1

What are the available environmental systems?

Answer 1

Heater
Air conditioner
Vents
Defogger

Question 2

How does the heater work?

Answer 2

Operates off bleed air system
Controlled by pilot in cockpit via valve
- either combo set-up: valve in cockpit above left shoulder with director on front left side pilot seat
- or (412CF): just valve on front left side pilot seat

MGT is increased with use of heater

Question 3

What are the components of the air conditioner system?

Answer 3

Compressor
Condenser
Evaporator

Question 4

Purpose of the compressor

Answer 4

Pressurize refrigerant, increases its temp, sends it to the condenser
Its mounted in engine compartment
- belt driven by TR drive shaft

Question 5

Purpose of the condensor?

Answer 5

Cool the refrigerant by forcing the air over the condenser heat exchanger
- mounted below baggage compartment

Question 6

Purpose of evaporators

Answer 6

The evaporators remove heat from the cabin by forcing cabin air across coils.
- one in front of the pilot station, one in the crew compartment on the back wall

Question 7

Describe the ventilation system

Answer 7

2 side windows in passenger doors
2 circle vents in crew doors
2 vent knots on instrument panel

Question 8

Describe the DEFOG system

Answer 8

Provides airflow for vent and defog on the ground or hovering
Powered by 2 electrically driven axial flow blowers installed in inlet end of defroster nozzles