ENVIRONMENTAL CONTROL – GENERAL
The environmental control system consists of the following sub-systems:
• ventilation
• heating
• air conditioning
VENTILATION SYSTEM – GENERAL
The purpose of the ventilation system is to supply fresh air to the cockpit and
cabin.
The ventilation system is composed of three independent sub-systems as
follows:
• Pilot ventilation sub-system
• Copilot ventilation sub-system
• Cabin ventilation sub-system
Pilot and copilot ventilation systems make up the cockpit ventilation system
controlled by a single CREW selector on the Environmental Control System
(ECS) control panel.
The cabin ventilation system is controlled by the PAX selector on the ECS
control panel.
In the long nose helicopter the nose avionic bay is provided with a dedicated
ventilation sistem.
COCKPIT VENTILATION
Pilot and copilot ventilation systems are independent and arranged
symmetrically but controlled by a single rotary knob only (VENT CREW).
Each of them is composed of:
• a ram air intake located under the lower part of the nose compartment
• a flapper valve, electrically controlled to be either fully open (ventilation
on) or fully closed (ventilation off)
• an electrical fan for forced air operation
• five outlets:
- two adjustable face outlets on the instruments panel
- two free outlets for the windshield (main and side)
- one free outlet for the lower window.
CABIN VENTILATION
The cabin ventilation system is a single independent system which provides
fresh air to passengers and is composed of:
• a ram air intake located on the upper deck fairing
• a flapper valve electrically controlled to be either fully open (ventilation
on) or fully closed (ventilation off)
• an electrical fan for forced air operation
• twelve adjustable outlets located in the PSUs (Passenger Service
Units)
NOSE AVIONIC BAY VENTILATION
For long nose helicopter only, the nose avionic bay ventilation system
consists of two electric fans located on the forward frame of the nose landing
gear bay.
The fans are automatically operated when the aircraft is on the ground
(WOW microswitch) to extract hot air from the nose avionic bay.