AirComm Corporation Airbus EC120 Cabin Air Conditioner Instructions for Continued Airworthiness User Manual

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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CHAPTER 1 
INTRODUCTION 
1. Scope 
The  scope  of  this  manual  encompasses  scheduled  and  unscheduled  maintenance 
procedures for continued airworthiness of Air Comm Corporation air conditioning system 
installed in Airbus EC120B series helicopter. 
2. Purpose 
The purpose of this manual is to provide aircraft field mechanic necessary information to 
maintain the air conditioning system. 
3. Arrangement 
This  manual  is  arranged  by...

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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temperature of cooling air. 
M. Vacuum: A  negative  pressure,  or  pressure  below  atmospheric;  it  is  usually 
expressed in inches of mercury. 
N. Vapor: The  gas  formed  by  boiling  or  evaporating  a  liquid.    A  gas  at  a 
temperature below its critical temperature. 
6. Abbreviations 
InHg: Inches of Mercury 
Lbs: Pounds 
Oz: Ounces 
Psig: Pounds per Square Inch (gauge) 
Gr: Grams 
Kg: Kilograms 
Kg/cm: Kilograms per Centimeter...

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In  addition  to  the  revision  of  the  manual,  those  changes  categorized  as safety-of-flight 
shall  have  a  Service  Bulletin  issued  to  the  operator  providing  the  necessary  information 
to comply with or to correct the safety-of-flight issue. 
 
Replacement or revised copies of this manual can be obtained by contacting: 
 
Air Comm Corporation Service Department 
1575 W. 124th Ave. 
Westminster, CO.80234 
Phone No....

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14.  Description of Vapor Cycle Air Conditioner and Installation 
 
This  section  contains  a  general  overview  of  a vapor-cycle  air  conditioning  system  and 
how  it  functions.  This  type  of  system  operates  in  a  closed  loop,  in  which  the  refrigerant 
absorbs heat from the cabin and ejects it into the outside air. The refrigerant then returns 
to  the  cabin  to  repeat  the  cycle.  The  operation  of  the  system  is...

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15. Refrigeration Cycle Illustration 
 
 
 
 
Figure 1-2 – Refrigeration Cycle Illustration 
(NOTE: This illustration is provided as a reference only and may not match actual installation) 
 
 
 
High pressure liquid 
Low pressure vapor 
Low pressure liquid 
High pressure vapor 
Compressor 
Condenser 
Aft Evaporator 
Receiver- 
Drier 
Bypass 
Valve 
Expansion 
Valves 
Fwd Evaporator  

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CHAPTER 2 
AIRWORTHINESS LIMITATION SECTION 
 
1. Airworthiness Limitations 
 
The  Airworthiness limitations  section  is  FAA  approved  and  specifies  inspections  and 
other  maintenance  required  under  Sections  43.16  and  91.403  of  Federal  Aviation 
Regulations unless an alternative program has been FAA approved. 
 
“No airworthiness limitations associated with this type design change.”...

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CHAPTER 3 
INSPECTIONS AND OVERHAUL  
 
1. Inspection Requirements 
 
PERIODIC INSPECTIONS 
(Hours are aircraft time) 
Item Annual Every 25 
Hours of  
Operation 
Every 100 
Hours of 
Operation 
Special Inspection Information 
Evaporator Blower Hi/Lo 
Operation 
 
X 
  
X Check for operation 
 Condenser  
 Blower Motor, Scoop Door 
Actuator 
 
X 
 
 
 
X Check for operation 
 
Forward & Aft Evaporator 
Blower motor 
X  X  Check for operation...

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A. Inspection of the Fwd and Aft Evaporator Blower Motors: 
 
CAUTION 
Fans  are  designed  to  operate  with  the  resistance  of  the  entire  ducting 
system.  Operation  of  the  evaporator  fans  with  any  part  of  the  distribution 
system removed may cause permanent damage to the fan motor. 
 
WARNING 
Fans  may  take  up  to  10  seconds  to  start  after  the  switch  is  turned  on. 
Keep hands away from fan wheels or blades...