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

							AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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5) Place the A/C mode switch into the Off position and verify: 
a. The condenser fan deactivates. 
b. The compressor clutch disengages and all blowers deactivate. 
 
C. Inspection of the Drive Belt: 
 
1) Remove  transmission  cowling  to  gain  access  to  compressor  drive  belt  and 
visually inspect the A/C compressor drive belt for the following: 
a. Any signs of excessive wear. 
b. Any signs of glazing. 
c. Any cracks or missing pieces. 
d. Any exposed fibers. 
2) Verify  proper  belt  tension  as  shown  in  the  illustration  shown  below.  (See 
Figure 3-1) 
 
 
Figure 3-1 – Belt Tension Inspection 
 
D. Inspection of Placards And Markings: 
 
1) Check all air conditioner placards and markings for security and legibility. 
 
E. Inspection of Compressor Assembly: 
 
NOTE: 
The  air  conditioning  system  must  be  serviced  with  refrigerant  to  perform 
this inspection. 
 
1) Connect  28V  ground  power  to  the  aircraft  and  place  the  A/C  mode  switch  in 
the  “A/C”  position  and  verify that  the Compressor  clutch  is  engaged  and  the 
“AC COMP FAIL” message is not illuminated on the ADIU display. 
2) Place  air  conditioner  switch  to  the  OFF  position  and  verify  that  the 
Compressor  clutch  is  disengaged  and  the  “AC  COMP  FAIL”  message  is  not 
illuminated on the ADIU display. 
3) Visually inspect the compressor assembly for the following. 
a. Security of all attaching hardware. 
b. Signs of refrigerant or oil leaks. 
c. Signs of excessive belt slippage or excessive heat. 
  
						

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F. Inspection of Compressor Mount Assembly: 
 
1) Visually inspect compressor mount of any signs of the following: 
a. Any cracks. 
b. Security of attaching hardware. 
c. Elongation of component mounting holes. 
 
G. Inspection of A/C Refrigerant Plumbing: 
 
1) Visually inspect for any signs of the following:  
a. Refrigerant gas leaks. 
b. Refrigerant oil leaks. 
c. Chaffing or excessive corrosion. 
d. Security of attaching hardware. 
 
H. Inspection  of Compressor  Drive  Quill  (Part  of  the EC120 aircraft  type 
design): 
 
1) Inspect security of attaching hardware. 
 
I.  Inspection Of Blower Electrical Connectors (annual requirement) 
 
1)  Locate the Molex electrical connectors that power the aft evaporator and 
condenser blowers. See figures 4-1,2 and 4-9 thru 13.The connectors are at 
the interface between the blower harness and the aircraft harness and 
identified by their white plastic housing. 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. 
2)  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. 
3)   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/.  
						

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3. Component Overhaul / Replacement Schedule 
 
Description Part Number Overhaul / Replacement 
Hours 
Condenser & Forward / Aft 
Evaporator Blower Motor & 
Fan replacement 
 
 
ES61136-12 Condenser    
    Motor for pre-Aug2014 kits 
 
ES61082-3  Condenser Motor     
    for post-Aug2014 kits 
   
ES61074-1 Fwd. / Aft    
     Evaporator Motor 
 
NOTE: This P/N also applies 
as replacement part for 
ES61060-2 motors installed 
pre-2014   
The blower manufacturer 
recommends TBO of 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. 
  
						

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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 pedestal 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 “Cockpit Evaporator 
above) 
Aft (Main Cabin) Evaporator Is located on the main cabin roof area just 
forward of the Main Rotor Transmission. 
Condenser Assembly qhe condenser assembly is located on the 
aircraft belly below the passenger 
compartment. 
Compressor The compressor is mounted to the aft center 
section of the main transmission deck. 
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. 
 
  
						

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Figure 4-1  Layout of Air Conditioner Features  
 
EC120-804 
EC120-502 
EC120-702  
						

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2. Compressor Installation (view looking down and drive pulley looking fwd.) 
 
 
 
 
Figure 4-2 Compressor Installation details   
						

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Figure 4-3 Compressor Installation details  
 
  
						

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Figure 4-4  Compressor Drive Pulley details  
 
3. Aft Evaporator Installation  
 
 
Figure 4-5  Aft Evaporator, looking down  
						

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Figure 4-6  Aft Evaporator, looking aft 
 
Figure 4-7  Aft Evaporator, looking inboard  
						

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4. Forward Evaporator Installation  
 
  
Figure 4-8  Forward Evaporator, looking Down  
 
  
                               Figure 4-9  Forward Evaporator, looking inboard