AirComm Corporation Cessna 182T T182T Maintenance Manual

 Products, Inc. 
Maintenance Manual with Illustrated Parts Catalog 
CR-182-10
 
Introduction 
Page xi 
October 15, 2009   
3. GLOSSARY 
 
Nonstandard abbreviations and symbols used in the Maintenance Manual are 
described below. 
 
A/C     - Air-conditioning 
A/R     - As Required 
Assy    - Assembly 
Comm. Avail.  -  Commercially Available 
Evap   - Evaporator 
Gnd    - Ground 
GPU    - Ground Power Unit 
SW     - Switch 
VDC    - Volts Direct Current 
 
  

 Products, Inc. 
Maintenance Manual with Illustrated Parts Catalog 
CR-182-10
 
21-50-00 
Page 1 
April 5, 2002  AIR-CONDITIONING SYSTEM
 
 
SYSTEM DESCRIPTION 
 
1. AIR-CONDITIONING SYSTEM DESCRIPTION 
 
The Keith Products vapor cycle air-conditioning system uses liquid refrigerant 
R134a to cool the aircraft cabin.  The major components for the R134a air-
conditioning system consist of a compressor, condenser, receiver/drier, expansion 
valve, and evaporator.  The starter ring-gear pulley turns the...

 Products, Inc. 
Maintenance Manual with Illustrated Parts Catalog 
CR-182-10
 
21-50-00 
Page 2 
April 5, 2002   
Figure 1.  Air-conditioning Vapor Cycle System
   

 Products, Inc. 
Maintenance Manual with Illustrated Parts Catalog 
CR-182-10
 
21-50-00 
Page 3 
April 5, 2002  2. SYSTEM OPERATION 
 
The air-conditioning system is operated with the engine operating and power supplied to 
the aircraft electrical system.  To operate the system proceed as follows: 
 
1)  Turn on air-conditioning system by placing left hand control switch in the 
AIR COND position. 
2)  For maximum cooling, place the FAN control knob in the HI position, place 
the CABIN COOLING control...

 Products, Inc. 
Maintenance Manual with Illustrated Parts Catalog 
CR-182-10
 
21-50-00 
Page 101 
April 5, 2002    
AIR-CONDITIONING SYSTEM
 
 
TROUBLESHOOTING 
 
1. GENERAL 
 
The procedures below present troubleshooting charts for the air-conditioning 
system and the compressor.  A diagnoses chart is presented for insufficient air-
conditioning system cooling.  The performance of the air-conditioning system 
varies with ambient temperature and humidity.  The information below presents 
possible...

 
21-50-00 
Page 102 
April 5, 2002   
 
INSUFFICIENT COOLING
SUCTION 
PRESSURE 
IS HIGH 
EXPANSIO0N VALVE IS 
OPEN EXCESSIVELY. 
 
CHECK SENSING BULB 
INSTALLATION.  IF 
SECURE & WELL 
INSULATED, THEN 
REPLACE EXPANSION 
VALVE.  IF NOT, THEN 
SECURE AND PROPERLY 
INSULATE AND RETEST. 
PLUMBING AT RECEIVER/DRIER 
OUTLET HAS LOW TEMPERATURE.  
RECEIVER/DRIER IS RESTRICTED.  
REPLACE RECEIVER/DRIER. 
BUBBLES IN SIGHT GLASS 
CHECK REFRIGERATION LINE FOR GAS 
LEAKS, AND REPAIR LEAKS IF ANY.  CHARGE...

 Products, Inc. 
Maintenance Manual with Illustrated Parts Catalog 
CR-182-10
 
21-50-00 
Page 103 
April 5, 2002  3. AIR-CONDITIONING SYSTEM TROUBLESHOOTING 
 
 CONDITION 
 
SERVICE 
PRESSURE 
GAUGE READING 
 
 PROBABLE CAUSE
 
CORRECTIVE 
ACTION 
 
INSUFFICIENT 
REFRIGERANT 
CHARGE 
 
Insufficient cooling.  
Bubbles appear in 
sight glass.    
SUCTION  
PRESSURE:  below 
normal 
 
DISCHARGE 
PRESSURE:  below 
normal  
 
Refrigerant is low, or leaking 
a little.  
 
1.  Leak test. 
2.  Repair leak. 
3....

 Products, Inc. 
Maintenance Manual with Illustrated Parts Catalog 
CR-182-10
 
21-50-00 
Page 104 
April 5, 2002   
 
 CONDITION 
 
SERVICE 
PRESSURE 
GAUGE READING 
 
 PROBABLE CAUSE
 
CORRECTIVE 
ACTION 
 
AIR IN SYSTEM 
 
Insufficient cooling.  
 
Sight glass shows 
occasional bubbles.    
SUCTION  
PRESSURE:  above 
normal 
 
DISCHARGE 
PRESSURE:  above 
normal  
 
 
Air mixed with refrigerant 
in system.  
 
 
1. Discharge system. 
2. Replace 
receiver/drier. 
3. Evacuate and 
charge system....

 Products, Inc. 
Maintenance Manual with Illustrated Parts Catalog 
CR-182-10
 
21-50-00 
Page 105 
April 5, 2002   
 
 CONDITION 
 
SERVICE 
PRESSURE 
GAUGE READING 
 
 PROBABLE CAUSE
 
CORRECTIVE 
ACTION 
 
FAULTY 
COMPRESSOR 
 
a) Insufficient 
cooling. 
 
 
 
b) Insufficient 
cooling. 
 
 
 
 
 
c) Rough running. a) SUCTION  
PRESSURE:  much 
below normal 
 
 
DISCHARGE 
PRESSURE: much  
below normal 
 
b) SUCTION 
PRESSURE:  much 
above normal 
 
DISCHARGE 
PRESSURE:  much 
below normal 
 
 
 a)...

Products, Inc. 
CR-182-10 System Service Manual 
 
21-50-00 
Page 201 
April 5, 2002 
 
AIR-CONDITIONING SYSTEM 
 
MAINTENANCE PROCEDURES 
A. General 
 
The following procedures are used to perform typical maintenance on the air-
conditioning system plumbing.  Procedures are provided for making connections 
to components, and replacing the expansion valve.  Keith Products air-
conditioning systems use swaged hose fittings with o-ring type connections. 
 
B. Tools and Equipment 
 
 
Designation  
Ref. No....