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1250284-1
REDUCER FITTING
1
63
1134419-1
SPRING CLIP
1
70
NAMEPLATE
N/P
110
NAS1149FN832P
FLAT WASHER
4
120
8-32X5/8IHS
SCREW
4
Figure 10003 Evaporator Module Assembly Details
- ITEMS NOT ILLUSTRATED
N/P ITEMS NOT PROCURABLE
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 11001
FEBRUARY 16, 2010
SPECIAL PROCEDURES
TASK 21-00-09-82-801
12.0
SPECIAL PRODECURES
SUBTASK 21-00-09-82-001
12.1
Motor Insulation Resistance Check:
12.1.1
After the inspection of the commutator, a quick check of the motor insulation resistance should be performed. This check may be done with or without the brushes installed, but the power leads must be removed from the motor during this procedure.
12.1.2
Gain access to the Compressor Drive Module, Forward Evaporator Module, or Aft Evaporator Module (refer to the aircraft maintenance manual for removal of access panels and other hardware that might need to be removed)
12.1.3
Verify that power is removed from aircraft. If it is not practical to remove aircraft power, technician must pull and collar applicable circuit breakers.
12.1.4
With OHM meter positive lead connected to the motor positive terminal and the other lead connected to motor case (grnd), measure and record resistance. Resistance value must be equal to or greater than 10,000 OHM’s. If less, the motor should be replaced.
SUBTASK 21-00-09-20-001
12.2
Motor Bearing Inspection:
12.2.1
Motor bearing should be inspected every 800-1000 operational hours to ensure that premature seizure does not occur.
12.2.2
Gain access to the Compressor Drive Module, Forward Evaporator Module, or Aft Evaporator Module (refer to the aircraft maintenance manual for removal of access panels and other hardware that might need to be removed)
12.2.3
Verify that power is removed from aircraft. If it is not practical to remove aircraft power, technician must pull and collar applicable circuit breakers.
12.2.4
Remove brush cover (on some systems, removal of power leads is required prior to brush cover removal, tag positive terminal).
12.2.5
Remove brushes from guides and remove belt from motor pulley (refer to Disassembly, Section 5).
12.2.6
Rotate motor shaft by hand to ensure freedom of movement. Visually inspect bearing for sign of overheating or loss of lubrication using an inspection mirror.
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 11002
FEBRUARY 16, 2010
CAUTION: CAREFULLY LAY BRUSH SHUNT LEADS IN A POSITION WHICH WILL PREVENT ANY POSSIBLE SHORTING PROBLEMS. LEADS MUST EASILY FOLLOW BRUSH AND SPRING MOVEMENT AS WEAR OCCURS. IMPROPER LEAD PLACEMENT MAY RESULT IN MOTOR DAMAGE.
12.2.7
If bearings rotate smoothly and are good, reinstall belt and brushes (refer to Assembly, Section 9). Check belt alignment and tensioning (refer to Assembly, Section 9).
SUBTASK 21-00-09-82-002
12.3
Motor Brush Seating Procedure:
12.3.1
Cut 4” long by 1.5 “ wide strip of 400-500 grit paper and place, with rough side out, on motor commutator. Secure one end of the paper to the commutator with masking tape in a manner such that the taped end will lead in the direction of shaft rotation (CCW looking at fan end). The other end will remain loose and overlap the taped end. Raise each brush momentarily while rotating the shaft until the taped end passes under each brush. After the grit paper is properly located tight against the commutator and encompasses all brush surface area, carefully rotate the armature by hand in the normal direction of rotation until a full seat is obtained on each new brush. Three to four rotations is generally adequate.
CAUTION: EXCESSIVE SEATING IS NOT ADVISED OR BRUSH LIFE MAY BE REDUCED.
12.3.2
Remove grit paper and blow out all the carbon dust and other contamination from commutator and brush area.
SUBTASK 21-00-09-20-002
12.4
Compressor Oil Level Check:
NOTE: Checking compressor oil quantity is only required if an excessive amount of oil is observed due to leaking or the system has been vented quickly thereby causing a loss of oil. An oil check can only be made with the system vented.
12.4.1
When replacing the compressor, use the following procedure to add required oil to system.
12.4.2
Drain and measure oil from new compressor (3 oz).
12.4.3
Drain and measure oil from failed compressor. Record quantity in ounces.
　
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