AirComm Corporation Airbus EC130 Cabin Air Conditioner Instructions for Continued Airworthiness User Manual

							 
AIR CONDITIONER SERVICE MANUAL EC130-200M-1 
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12. CHANGES TO INSTRUCTIONS FOR CONTINUED AIRWORTHINESS 
Changes made to a line or paragraph of this document will be indicated by a vertical bar 
in the right hand margin, while a complete page change will be indicated by a vertical 
bar next to the page number. 
 
 
(Example: Any change will appear with a vertical bar next to that change). 
 
 
13. AIR CONDITIONER FEATURES 
 
The vapor cycle air conditioner features one forward mounted evaporator (cockpit), one 
aft mounted evaporator assembly (behind main cabin), one condenser, and a 
compressor driven by the tail rotor drive shaft just aft of the aft main transmission 
aircraft left. These components combine to provide “conditioned air” through the existing 
air distribution system when the engines are operating during both ground and flight 
operations.  
 
This system can be operated in either the Air Condition (A/C), or Fan mode. In the A/C 
mode, conditioned air is provided by the forward and aft evaporators to the cockpit and 
main cabin areas respectively. In the Fan mode, the evaporator blowers are used to 
circulate cabin air, while the compressor clutch remains disengaged. When using the 
cabin heater it is acceptable to operate the air conditioner if desired, to assist in 
defogging the cabin windows. 
 
The air conditioning system is connected electrically to the aircraft’s DC Power Panel 28 
VDC Bus. 
 
The control panel for the air conditioner system is located on the existing overhead 
switch panel just forward of the pilot’s and co-pilot’s seats. This panel consists of the 
A/C & Fan switch, two switches, for the control of the Cockpit & Cabin evaporator blower 
fan speeds, a “FRESH” / “RECIRC” switch which opens and closes an air inlet box 
located just forward of the aft evaporator, a Temperature control rheostat knob, and 
panel light dimmer rheostat knob.   
						

							 
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Forward Evaporator optional 
 
 
             
 
COCKPIT A/C CONTROL PANEL 
  
 
The Fan motors feature dual speed operation (Hi or Lo), and this feature can be used in 
both the air conditioner or fan modes. 
 
The compressor is mounted to the surface of the Main Gearbox (MGB) Coupling Case, 
in the aft aircraft center portion of the transmission compartment. It is driven by a Ploy 
V-belt and a pulley which is mounted to the main drive shaft. Access to the compressor 
is provided by transmission compartment access doors. Airflow through the condenser 
heat exchanger is provided by one 28 volt DC high performance blower, and is 
enhanced by means of a retractable scoop door providing ram air in forward flight. 
(Condenser is mounted in the L/H side baggage compartment when the EC130-202 kit 
is installed). 
 
The aft evaporator is equipped with a Freeze Switch. The Freeze Switch probe is 
located in the core of the evaporator heat exchanger. This unit performs two functions; 
1. It acts to prevent coil freeze-up by limiting the minimum coil temperature to 32º F (0º 
C), and 2. It acts in conjunction with the cabin air temperature control system, by 
controlling the bypass of refrigerant through the evaporator coil in response to 
adjustment of the thermostat Switch located on the overhead control panel assy. 
between the pilot and co-pilots seats. 
 
 
The system is also equipped with a binary pressure switch, which is located on the air 
conditioner discharge line. This switch is designed to protect the system against over-
pressure situations, or under-pressure in the event of refrigerant loss from the system. 
The switch also prevents the system from operating in low ambient temperatures below 
50º F (10º C).  
						

							 
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The switch operating pressures are: 
 
Low Pressure Function: 
Open at 28 ± 2.8 psig (2.0 ± 0.2 Kg/Cm)  
Close at 30 ± 4.3psig (2.1 ± 0.3 Kg/Cm)  
 
High Pressure Function: 
Open at 384 ± 30 psig (28.0 ± 2.0 Kg/Cm)  
Close at 298 ± 43 psig (20.9 ± 2.0 Kg/Cm) 
 
An optional Auxiliary Ventilation system may be installed to provide forced air ventilation 
to the existing overhead air outlets during forward flight. This optional ventilation system 
is operated manually by the means of a push / pull cable assembly mounted in the 
upper center area of the aft bulkhead. 
 
 
14. DESCRIPTION OF THE VAPOR CYCLE AIR CONDITIONER AND ITS 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 rejects it into the outside air. The refrigerant then 
returns to the cabin to repeat the cycle. The operation of the system is described below 
and depicted schematically in Figure 1.1 below. 
 
 
Liquid refrigerant is contained in the receiver-drier under pressure from the compressor. 
The receiver-drier also filters the refrigerant through a material known as desiccant. The 
desiccant insures that the fluid leaving this component is free of any water or other 
contaminants. 
 
The low pressure (suction) line from the compressor is attached to the evaporator lines, 
and causes the refrigerant to be pulled out of the receiver-drier and through the 
expansion valves. The expansion valves serve as a controlled spray orifice, to spray the 
correct amount of refrigerant into the evaporator.  
 
 
 This regulation of refrigerant allows the liquid to absorb the heat from the cabin air, and  
transform it to a vapor state just prior to its exiting the evaporator assembly.  
 
The low pressure vapor is then drawn into the compressor where its pressure is raised 
to approximately 200 psi (14.06 kgcm), and its temperature to around 200º F (93.3º C) 
This high pressure / high temperature vapor then travels to the condenser, (a heat 
exchanger cooled by a flow of outside air). Heat is extracted from the refrigerant, and as 
it cools it condenses back into a liquid and flows into the receiver-dryer, ready to repeat 
the cycle. 
 
  
						

							 
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      High pressure liquid 
      High pressure vapor 
      Low pressure liquid 
      Low pressure vapor 
      Expansion valve        
       By pass line 
 
 
Fig 1.1 Refrigeration Cycle Functional Schematic 
 
 
 
 
 
 
 
 
 
Receiver-Dryer 
Forward 
Evaporator 
 
Compressor 
Condenser 
Aft Evaporator 
By-pass valve  
						

							 
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CHAPTER 2 
AIRWORTHINESS LIMITATION SECTION 
 
1. AIRWORTHINESS LIMITATIONS  
 
“No airworthiness limitations associated with this type design change” 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
						

							 
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CHAPTER 3 
 INSPECTIONS 
 
1. INSPECTION REQUIREMENTS 
 
PERIODIC INSPECTIONS  
 
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 in Hi and Lo settings 
Compressor Drive Belt   X  X  X 
Check belt tension, and for signs of excessive wear (example: Glazing, Cracks, and exposed fibers) Air Conditioner Placards & Markings (see chapter 4) 
X   X Check for security and legibility 
Air Conditioner Compressor Assembly.  
 X  X  X 
Check for operation, security of attaching hardware, including dtrut protection clamps and signs of oil or refrigerant leaks. Check for minimum of 0.4” clearance between the compressor pulley and the transmission support strut. 
Air Conditioner Compressor Mount  X    X 
Check mount for cracks, and security of the attaching hardware. 
Plumbing and Fittings X  X Check for security and signs of oil or refrigerant leaks Air Conditioner Compressor drive pulley (mounted to tail rotor drive shaft) 
X  X Check for security of attaching hardware.  
Blower Electrical connectors X   
Visually inspect for signs of overheating. See sec. 2.0 below for details. 
 
 
2. INSPECTION OF BLOWER ELECTRICAL CONNECTORS  
 
a) Locate the electrical connectors that power the aft evaporator and condenser 
blowers. See figures 4-6 thru 4-13.The connectors are at the interface between the 
blower harness and the aircraft harness and identified by their white plastic housing.  
						

							 
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Note that the evaporator blowers have an additional connector to inspect located several 
inches away from the harness connector.  
NOTE: Aft evaporators supplied in late 2014 and newer use a gray plastic Deutsch 
connector and are not part of this inspection requirement. 
b) De-mate each connector and inspect both mates for signs of overheating 
(discoloration or plastic deformation). If any signs of overheating of the housing are 
present the system must be rendered inoperative and the connector housing and 
contacts replaced before further operation. Contact ACC service dept. for replacement 
parts if necessary. 
c) Installation & replacement of the wire harness electrical connectors for the evaporator 
and condenser blowers. 
To avoid potentially serious overheating issues the Molex style connectors (identified 
by their white plastic housing) installed on the aircraft harness for connecting to the 
evaporator and condenser blowers must be installed per ACC procedure PPP23 and 
only using the appropriate terminal crimp tool. This document is available on the 
ACC website www.aircommcorp.com/customer-support/service-manuals/. 
 
 
3. COMPONENT OVERHAUL / REPLACEMENT SCHEDULE 
 
 
Description Part Number Overhaul / Replacement Hours 
Condenser & Forward / Aft Evaporator Blower Motor (EC130-200 Installation only)   
ES61136-1 (Condenser Motor) ES61064-2(Fwd. / Aft Evaporator Motor) 
NOTE 1: The blower manufacturer recommends TBO at 500 hrs. At the discretion of the operator it is acceptable to operate the blower until failure. A blower failure will result in a reduction in cooling, but no safety of flight issues are involved. Aft Evaporator Blower Motor (EC130-202 Installation only) ES61142-1 (Aft Evaporator Motor) See Note 1 above. 
Condenser Motor / Fan Assy. (EC130-202 Installation only) 
ES73131-1 (New) ES73131-2 (Overhauled) Condenser Blower Motor & Fan Assy. See Note 1 above. 
  
						

							 
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CHAPTER 4 
LOCATION AND ACCESS 
 
1. LOCATION OF AIR CONDITIONER FEATURES 
 
Nomenclature Description of Location 
Air Conditioner Control Panel The air conditioner control panel is located in the existing center overhead panel between the pilot & co-pilot seats.  
Optional Forward (Cockpit) Evaporator The forward evaporator is mounted to the center pedestal forward of the instrument panel in the chin bubble area.  
Forward Evaporator Blower Assemblies The forward evaporator blower assemblies are integral to the Forward Evaporator Assembly. (See Forward Evaporator above) 
Aft (Main Cabin) Evaporator Is located on aircraft right, just aft of the main cabin area, and to the right side of the Main Rotor Transmission. Condenser Assembly (EC130-200 Installation only) The condenser assembly is located on the aircraft belly below the passenger compartment. Condenser Assembly (EC130-202 Installation only) The condenser assembly is located on the L/H side of the aircraft in the baggage compartment. 
Compressor The compressor is mounted to the main gearbox (MGB) coupling case. 
Refrigerant Plumbing 
The refrigerant plumbing is routed from the compressor, to the area below the passenger compartment, and forward to the nose area. (As the refrigerant plumbing connects the Compressor, Condenser, and Evaporators, it may at times be necessary to access these components through several panels. 
Servicing Ports The Service Ports for this system are located in the transmission compartment on aircraft. 
 
 
SIDE VIEW 
Fig. 4-1 Layout of Airbus EC130B Air Conditioning System 
EC130-200-1,-2 Installation 
   
						

							 
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2. LAYOUT OF AIR CONDITIONER SYSTEM  
 
Fig. 4-2 Top View - Model C130B Fuselage, EC130-200-1,-2 Install 
   
						

							 
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3. LAYOUT OF AIR CONDITIONER SYSTEM 
 
Fig. 4-3 Side View - Model EC130B Fuselage- Baggage area Condenser Installation-  
EC130-202-1 (Shown), -2 Install (opposite)