Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
Copyright © 2017
ATA 21-00-23
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18
Revision 10
June 1, 2017
TESTING AND FAULT ISOLATION
TASK 21-00-23-70-801
3.0
R-134A AIR CONDITIONING SYSTEM COMPONENT – TESTING AND FAULT ISOLATION
SUBTASK 21-00-23-99F-009
3.1
General:
3.1.1
Testing and Fault Isolation of the R-134A Air Conditioning System may be necessary if the
system does not operate and/or perform in accordance with information contained herein.
Therefore it is necessary for the service personnel to diagnose the discrepancy by
troubleshooting the system and its components. To assist in this diagnoses, refer to table 3
(Trouble Shooting List)
SUBTASK 21-00-23-70-001
3.2
Compressor Condenser Module Assembly Testing Procedures
(refer to Figure 10001):
3.2.1
Ensure that power is applied to the aircraft and that the air conditioning system is switched
on using the cockpit mounted selector switch. Gain access to the Compressor Condenser
Module (refer to the aircraft maintenance manual for removal of access panels and other
hardware that might need to be removed). Verify that these components are operating and
perform the following:
3.2.1.1
Verify that system is running smoothly and that there is no excessive noise and/or
vibration coming from the assembly.
3.2.1.2
Verify that the system is cooling properly.
3.2.2
If there is excessive noise and/or vibration coming from the Compressor Condenser Module
assembly or the system is not cooling, refer to Fault Isolation, Section 3.6, Disassembly
procedures in section 5 and Check (inspection) procedures in section 7. This will help in
identifying whether one or more components are dirty or damaged and are in need of repair
or replacement.
SUBTASK 21-00-23-70-002
3.3
Evaporator Module Assembly Testing Procedures
(refer to Figure 10002):
3.3.1
Verify blower motor operation in both low and high speed positions using cockpit mounted
selector switch.
3.3.2
While blower motor is operating in both positions, listen carefully for the following:
