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Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
EFFECTIVITY: ALL 21-00-09
Page 1002
FEBRUARY 16, 2010
SUBTASK 21-00-09-70-002
3.3
Evaporator Module Assembly testing procedures (refer to Figure 10003):
3.3.1
Verify blower motor (10) operation in all three (3) speed positions using cockpit mounted selector switch.
3.3.2
While blower motor is operating in all positions, listen carefully for the following:
•
Verify that there is a distinct and noticeable change in sound of blower motor when changing from low, mid, and high speed positions. This indicates that the cockpit selector switch is functioning properly and that the blower motor is responding accordingly.
•
Verify that there is a smooth transition when changing from low, mid, and high speed positions, and that there is no excessive noise or vibration coming from the blower motor during the change. Excessive noise could indicate that the blower wheel (20) is rubbing against the blower scroll (30).
3.3.3
If there is excessive noise and/or vibration coming from blower motor/wheel assembly (10,20,30) during this test, please refer to the disassembly procedures in section 5 and inspection procedures in section 7. This will help in identifying whether the blower motor wheel is dirty or damaged and is need of repair or replacement, the blower scroll is dirty or damaged and is need of repair or replacement, or the blower motor itself is in need of replacement.
3.3.4
Verify that the system is cooling properly.
SUBTASK 21-00-09-70-003
3.4
Compressor Drive Motor and Condenser Blower Motor Brush testing procedures:
3.4.1
The following procedures are required to calculate the remaining brush life for the compressor drive motor and the condenser blower motor (refer to Disassembly section 5 for brush removal).
3.4.2
Tools, fixtures, equipment, or consumable items required:
•
Small hand tools and socket set
•
Micrometer
•
Scribe or wire hook
•
Volt-OHM meter (digital)
•
Shop air (40 PSIG max)
•
Respiration mask
Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
EFFECTIVITY: ALL 21-00-08
Page 1003
FEBRUARY 16, 2010
3.4.3
Gain access to the compressor drive module and/or the condenser blower motor (refer to the aircraft maintenance manual for removal of access panels and other hardware that might need to be removed)
3.4.4
Verify that power is removed from aircraft. If it is not practical to remove aircraft power, technician must pull and collar applicable circuit breakers.
3.4.5
Remove brushes per Disassembly, Section 5.
3.4.6
After brushes have been removed from the motor, each brush should be measured in accordance with Figure 1.
Figure 1 Brush Length
3.4.7
Determine the brush with the shortest length and calculate remaining life per the following calculations:
3.4.7.1
Determine brush wear rate by subtracting the measured value from 0.895 inch and dividing by the operating hours. The remaining brush life is obtained by subtracting 0.395 inch (the minimum length) from the measured brush length and dividing by the wear rate.
3.4.7.2
Example:
3.4.7.2.1
Brush wear = 0.895-(measured value)
= 0.895-0.700= 0.195 inch
3.4.7.2.2
Wear = 0.195 inch
3.4.7.2.3
Wear rate = 0.195/500 hours=0.00039(in/hr)
3.4.7.2.4
Usable brush length = Measured value-Min length
Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
EFFECTIVITY: ALL 21-00-09
Page 1004
FEBRUARY 16, 2010
3.4.7.2.5
Remaining brush length =0.700-0.395=.305 inch
3.4.7.2.6
Remaining brush life =Usable brush length/wear rate
3.4.7.2.7
Remaining brush life =.305/0.00039 (in/hr)=782 hours
CAUTION: BRUSHES MUST BE RECHECKED PRIOR TO THE “REMAINING BRUSH LIFE” HOURS RUNNING OUT (CALCULATED HOURS REMAINING), OR DAMAGE TO THE MOTOR WILL RESULT.
SUBTASK 21-00-09-70-004
3.5
System Leak Check testing procedure:
3.5.1
A leak check of the refrigerant plumbing system is important to ensure the system maintains its charge to provide the designed performance and reduce damage to system components. A periodic check of the system charge is required to determine if any loss of refrigerant has occurred.
3.5.2
A system leak check is required any time one or more of the following conditions occur:
　
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