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Subsequent Aircraft Post SB 604−21−004) 02−10−17
Figure 02−10−9 Takeoff at Sea Level to Land at 14,000 feet 02−10−18
Figure 02−10−10 Takeoff at 14,000 feet to Land at Sea Level 02−10−19
Figure 02−10−11 Air Conditioning Panel 02−10−20
Figure 02−10−12 Cabin Pressurization Panel 02−10−21
Figure 02−10−13 Standby Cabin Altitude Indicator 02−10−22
Figure 02−10−14 Copilot’s Side Panel − Demist Knob 02−10−22
AIR CONDITIONING AND PRESSURIZATION
Table of Contents
Vol. 2 02−00−1
REV 66, Feb 01/07
CHAPTER 2 - AIR CONDITIONING AND PRESSURIZATION
02−00−1
CL−604 Operating Manual
PSP 604−6
TABLE OF CONTENTS
Page
TABLE OF CONTENTS
LIST OF ILLUSTRATIONS
DESCRIPTION
Figure 02−10−15 Air Conditioning and Pressurization Indications 02−10−23
Figure 02−10−16 Air Conditioning and Pressurization Indications 02−10−24
AIR CONDITIONING AND PRESSURIZATION
Table of Contents
Vol. 2 02−00−2
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
Page
GENERAL
The air conditioning system provides temperature-regulated conditioned air to the cockpit and
passenger cabin using two air conditioning units (ACUs), commonly referred to as “packs”.
An electric cockpit heating system and avionics cooling system are also provided.
Aircraft pressurization is accomplished by regulating the overboard discharge of the conditioned air
through two outflow valves. The automatic pressurization system maintains cabin pressure to provide
passenger comfort throughout all phases of flight within the limitations of the aircraft structure.
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 power 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 and high mode, according to the following
conditions:
• Low Mode: Airborne during dual-pack operation, or on the ground with the engines
supplying the bleed air, output pressure 24 psig;
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−1
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
AIR CONDITIONING SYSTEM (CONT'D)
• 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.
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 air cycle machine compressor, the secondary
　
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