FlightSafety LEARJET 45 - INTRODUCTION; GENERAL

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INTRODUCTION

The Learjet 45 air-conditioning system consists of a bleed-air temperature control sys-

tem and independent distribution systems to the cockpit and cabin for pressurization and

ventilation. Prior to engine start, the system can also be operated during ground opera-

tions using the auxiliary power unit (APU), if installed.

Primary heating and cooling is accomplished

by controlling the temperature of the bleed-

air entering the cockpit and cabin distribu-

tion systems. Temperature control is

accomplished by mixing pressurized hot com-

pressed air and cooled compressed air as pro-

vided through the onboard environmental

control unit (ECU). Cooling is accomplished

by two methods; heat transfer within the pre-

cooler and primary/secondary heat exchanger

and compression with rapid expansion through

the air cycle machine (ACM).

The pressurization and air conditioning sys-

tem distributes conditioned bleed-air through-

out the cabin and cockpit. A portion of the

CHAPTER 11

AIR CONDITIONING

11-1

FOR TRAINING PURPOSES ONLY

LEARJET 45 PILOT TRAINING MANUAL

FlightSafety

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GENERAL