AW139 PTS - Environmental System Flashcards
Describe the ventilation system
Supplies fresh air to the cockpit and cabin
Pilot and copilot have individual ventilation systems that are controlled together
Cabin has its own ventilation system
Where are the air intakes located for the ventilation system?
Cockpit vent/AC is under the nose
Cabin vent/AC is on the upper deck fairing
Heater is on the left side just behind the cabin
What does the OFF/ON/LOW FAN/HIGH FAN do?
OFF - valve off, no air flow
ON - valve open - ram air only
LOW FAN - fan operating at low speed
HIGH FAN - fan operating at high speed
What is the limitation below 25kts
AC must be in recycle
Describe the interior cooling system.
Separate compressor, condenser and evaporator for cockpit and cabin.
Compressors mechanically driven by the MGB via electromagnetic clutches.
Air Conditioning Control Boxes (ACCBs) monitor air temp, ECS control panel compares temperatures and controllers the compressors as required.
Where is the AC system?
Located on the upper deck.
Cockpit vents are in instrument panel.
Cabin vents are in the cabin ceiling.
Heating ducts are in the floor.
How many compressors are there and how are they powered?
2
Via the MGB
What happens when we go from NORM to RECYCLE on the A/C
Normal - draws outside air
Recycle - Recycles air in the aircraft
Describe the heating system
Draws ambient air from intake on the upper left side and mixes it with hot P3 bleed air from both engines.
Temp control valve is sent via the setting on the ECS panel.
Where is the air intake for the heating system?
Upper left hand side, behind the cabin door
Where does hot air come from for the heating?
P3 Bleed air
Is the ducting the same for the a/c and heating?
No - both separate.
What does the knob AUTO/MAN do?
Manual utilises the +/- setting. Auto uses the temp control.
