AirComm Corporation Bell 407 Air Conditioner Instructions for Continued Airworthiness User Manual

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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19. AIR CONDITIONER FEATURES 
The  vapor  cycle  air  conditioner  features  one  or  two  forward  mounted  evaporator 
(cockpit),  one  aft  mounted  evaporator  (main  cabin),  one  condenser,  and  a 
compressor  driven  by  the  tail  rotor  drive  shaft  just  forward  of  the  aft  engine 
compartment  fire  wall.  These  components  combine  to  provide  “conditioned  air” 
through  the  existing  air  distribution  system...

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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Figure 2:  A/C Temperature Control Knob 
The  compressor  is  mounted  to  the  surface  of  the  engine  drain  pan,  in  the  aft 
aircraft  left  portion  of the  engine  compartment.  It  is  driven  by  a  V-belt  and  a 
pulley  which  is mounted  to  the  tail  rotor drive  shaft.  Access  to  the  compressor is 
provided by engine compartment access doors. 
Airflow through the condenser heat exchanger is provided by one 28...

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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20. 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...

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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21. Refrigeration Cycle Illustration 
(PLEASE NOTE: This illustration is provided as a reference only and may 
not match actual installation) 
 
 
 
 
Figure 3:  Refrigerant Cycle Illustration 
 
High pressure liquid 
Low pressure vapor 
Low pressure liquid 
High pressure vapor 
Compressor  
Condenser 
Evaporator 
Receiver 
Drier Bottle  
Bypass 
Valve 
Expansion 
Valves  
Evaporator   

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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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 paragraph 43.16 and 91.403 of the Federal Aviation 
Regulations unless an alternative program has been FAA approved. 
 
No airworthiness limitations are associated with this type design change....

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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CHAPTER 3 
INSPECTIONS 
 
1. INSPECTION REQUIREMENTS 
 
PERIODIC INSPECTIONS 
(Hours are aircraft time) 
 
Item Annual, +/- 1 month Every 50 Hours of  Operation, +/- 5 hrs. Every 100 Hours of Operation, +/-10 hrs. Special Inspection Information Evaporator Blower Hi/Lo Operation  X   X Check for operation. 
Condenser Blower Motor, Scoop Door Actuator ES39210-2 
 X    X Check for operation.  
Forward Evaporator Blower Motor ES61064-10...

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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3. INSPECTION PROCEDURES.  
 
NOTE 
Refer to “Chapter 4 location and access” to locate all components for inspection. 
 
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...

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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b. Install a jumper between the contacts of the binary switch if 
required. 
c. Connect 28V ground power to the aircraft and place the A/C 
mode switch in the “A/C” position and verify that: 
1. Condenser scoop opens. 
2. Condenser fan is activated and operating. This fan should 
pull air into the aircraft through the open scoop and exit at 
the screen below the condenser. 
3. Compressor clutch is engaged. Verify compressor clutch...

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D. Inspection of air conditioner placards and markings. 
a. Check all air conditioner placards and markings for security and 
legibility. 
 
E. Inspection of air conditioner compressor assembly 
NOTE: 
The air conditioning system must be serviced with refrigerant to perform this 
inspection 
a. Connect 28V ground power to the aircraft and place the A/C 
mode switch in the “A/C” position and verify: 
1.  Compressor clutch is engaged....

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 removal instructions to allow removal and further inspection to 
 determine if the pulley or drive ring need to be replaced. 
4. If there is no detectable looseness, and no significant metal 
 dust/powder residue present, re-tension the belt per Section 8. 
5. Check security and condition of all related fasteners. 
 
I. Inspection of Blower Electrical Connectors 
1. Locate the electrical connectors that power the evaporator and...