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During unpressurized flight, ram air may be used to ventilate the cockpit and cabin.
AIR CONDITIONING SYSTEM
Description
The air conditioning system converts 10th-stage bleed air from the engines, APU, or an external source into temperature-regulated pressurized air for distribution to the cockpit and cabin.
The air conditioning system consists of two packs, a temperature control system, distribution ducting, and a ram air system for pack cooling and supplementary ventilation.
A single pack can provide sufficient air to cool and pressurize the aircraft.
Components and Operation
Packs
The packs are located in the aft equipment bay, and are referred to as the left pack and right pack. The L (R) PACK switch/lights on the AIR CONDITIONING panel are used to operate the respective air conditioning pack.
The packs are monitored for overtemperature and overpressure conditions and have automatic protection for both cases.
The left pack is powered by the DC essential bus, and the right pack is powered by DC bus 2. In the event of a double-generator failure when airborne, leading to deployment of the air-driven generator, the left pack remains operational, enabling continued flight at high altitude.
In the event of a single-pack failure, the remaining pack can supply sufficient conditioned air to both compartments.
Pack Pressure Regulation
When the L (R) PACK switch/light is pressed in, the corresponding pressure-regulating shutoff valve (ACU valve) allows bleed air from the 10th-stage manifold to enter the pack. The ACU valves operate in two different modes, low mode or high mode, according to the following conditions:
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Low Mode: Airborne during dual-pack operation, or on the ground with the engines supplying the bleed air, output pressure 24 psig;
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High Mode: Airborne during single-pack operation, or on the ground with the APU/Ground Air Source supplying the bleed air, output pressure 39.5 psig.
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.2
Oct 05/06
NOTE
If single pack operation results from causes other than overpressure or overtemperature, then the failed pack switch/light must be deselected in order for the remaining pack to operate in high mode.
Pack Operation
The right pack normally operates from right engine bleed air and the left pack normally operates from left engine bleed air.
The prime function of the packs is to produce cold air. Heat exchangers and a cold air unit are used to cool the bleed air as it flows through the pack. The temperature of the hot bleed air entering the pack is first reduced by the precooler heat exchanger and the primary heat exchanger. The pressurized air then enters the cold air unit compressor, the secondary heat exchanger, and finally the cold air unit turbine to complete the cooling process.
Pack Air Treatment
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