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RAM AIR VALVE
If the air conditioning system fails, ram air can be used to ventilate the cockpit and cabin at low altitude. After descending below 10 000 ft, selecting the guarded RAM AIR switch to ON opens the ram air valve to provide air flow into the aircraft.
RAM AIR — Used to provide ambient air to ventilate the cockpit and cabin, in the event of PACK and TRIM AIR failure.
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
02-03-04 AIR CONDITIONING SYSTEM (Cont)
PNEUMATIC SOURCES
IN FLIGHT OPERATIONS
The engines can provide bleed air at all altitudes. The APU can provide bleed air up to 20 000 ft.
GROUND OPERATIONS
The air conditioning PACK can be operated with air from the APU, aircraft engines, or external ground cart. However, due to low pressure from the engines at ground idle, it is recommended to use the APU during ground operations.
AIR DISTRIBUTION AND EXHAUST SYSTEM
The Air Distribution and Exhaust System is used to distribute, and ensure air exhaust of conditioned air to the flight deck, cabin, and lavatory areas. The system is consists of low pressure ducting installed below and above the aircraft floor.
FLIGHT DECK DISTRIBUTION
Flight deck air distribution is ensured by a duct connected to the bulkhead check valve manifold. This duct runs under the aircraft floor, from the aft pressure bulkhead area to the cockpit. Air is then distributed by outlets at foot and leg level, on each side of the instrument panel, and a grill outlet on each side console. There are also overhead gaspers that distribute cold air only. All other outlets are temperature controlled.
PASSENGER CABIN DISTRIBUTION
Cabin air distribution is provided by two main lines connected to the bulkhead check valve manifold. These lines provide air at foot and head level. Air distribution from the overhead gaspers is cold air only. Air from provided at floor level is temperature controlled. The upper feed line runs upwards between the aircraft skin and the liner of the cargo compartment and is integral to the interior furniture located on either side of the aircraft at head level.
LAVATORY VENTILATION
A gasper supplies fresh air to the lavatory compartment.To avoid unpleasant odors in the passenger cabin, more air from the lavatory is exhausted underfloor than is supplied by the conditioned air system. A vent is installed in the lavatory wall to equalize pressure.
AIR EXHAUST AND VENTILATON PATH
After fresh air is supplied to the cabin and cockpit, it is dumped overboard through the cabin pressure control system. The air path in the cabin is designed for optimum comfort of the passengers and crew and optimum equipment ventilation man-agement. Cabin exhaust air to the under-floor area and outflow valve is ensured through holes in the floor sill. Some of the cabin air exhaust is also directed under the floor, to ventilate and heat the battery compartment, and directly dumped over-board through the avionics valve. Cockpit exhaust air to the under-floor area and outflow valve is ensured through holes in the cockpit floor and center pedestal. Air circulation is also provided at the back of the cockpit displays through specially designed grilles.
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