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Pilatus PC12 Manual

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OPERATING, SERVICING, AND COMPONENT
WITH ILLUSTRATED PARTS LIST
1) COMPRESSOR CONDENSER MODULE ASSEMBLY, PART # 1250900-4
2) EVAPORATOR MODULE ASSEMBLY, PART # 1250200-42 (L) /-43 (C,R)
ATA SPECIFICATION
COPYRIGHT  2007
ENVIRO SYSTEM INC.
MAINTENANCE MANUAL
PILATUS PC12
R-12 AIR CONDITIONING SYSTEM COMPONENTS:
ORIGINAL ISSUE
DECEMBER 28/ 2007
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
21-00-22
21-00-22
JULY 21, 2011

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  • Page 1 Fax (405) 382-0737 http://www.enviro-ok.com OPERATING, SERVICING, AND COMPONENT MAINTENANCE MANUAL WITH ILLUSTRATED PARTS LIST PILATUS PC12 R-12 AIR CONDITIONING SYSTEM COMPONENTS: 1) COMPRESSOR CONDENSER MODULE ASSEMBLY, PART # 1250900-4 2) EVAPORATOR MODULE ASSEMBLY, PART # 1250200-42 (L) /-43 (C,R) ATA SPECIFICATION 21-00-22 COPYRIGHT ...

  • Page 2: Record Of Revisions

    Component Maintenance Manual RECORD OF REVISIONS DESCRIPTION OF CHANGE DATE APPROVAL ORIGINAL RELEASE 12/28/07 Updated Storage, Section 14. Updated information concerning 5/5/08 cold weather operations under General and System Off Season/On Aircraft Functional Testing. Delete page 2002 Subtask 21-00-22-99-002 9/19/08 This removes wiring diagram Figure 3, and removes 4.2 “Wiring Schematic”and4.2.1 "The following electrical schematic shows the system components and how they interrelate to each other."...

  • Page 3: Record Of Temporary Revisions

    Component Maintenance Manual RECORD OF TEMPORARY REVISIONS DESCRIPTION OF CHANGE DATE APPROVAL EFFECTIVITY: ALL 21-00-22 Record of Temporary Revisions Page 2 JULY 21, 2011...

  • Page 4: List Of Service Bulletins

    Component Maintenance Manual LIST OF SERVICE BULLETINS SERVICE DESCRIPTION DATE BULLETIN # RELEASED EFFECTIVITY: ALL 21-00-22 List of Service Bulletins Page 3 JULY 21, 2011...

  • Page 5: List Of Effective Pages

    Component Maintenance Manual LIST OF EFFECTIVE PAGES CHAPTER / SECTION PAGE DATE CHAPTER / SECTION PAGE DATE 12/28/07 5/5/08 9/19/08 07/21/11 EFFECTIVITY: ALL 21-00-22 List of Effective Pages Page 4 JULY 21, 2011...

  • Page 6: Table Of Contents

    Component Maintenance Manual TABLE OF CONTENTS RECORD OF REVISIONS...........................1 RECORD OF TEMPORARY REVISIONS......................2 LIST OF SERVICE BULLETINS .........................3 LIST OF EFFECTIVE PAGES..........................4 TABLE OF CONTENTS ............................5 LIST OF ILLUSTRATIONS ..........................7 LIST OF TABLES ..............................7 INTRODUCTION..............................8 MANUAL INTRODUCTION........................8 1.1 General introduction (How to Use): ....................8 1.2 Acronyms, Abbreviations, and Symbols:...................9 1.3 Standard Torque Values: ........................10 1.4 Documents Required:.........................10...

  • Page 7: Table Of Contents

    Component Maintenance Manual REPAIRS ...............................6001 R12 AIR CONDITIONING SYSTEM COMPONENT – REPAIR PROCEDURES......6001 8.1 General:............................6001 8.2 Compressor Condenser Module Repair Procedures:..............6001 8.3 Evaporator Module Assembly Repair Procedures:..............6003 ASSEMBLY ..............................7001 R12 AIR CONDITIONING SYSTEM COMPONENT - ASSEMBLY..........7001 9.1 General:............................7001 9.2 Compressor Condenser Module Assembly Procedures ............7002 9.3 Evaporator Module Assembly Procedures ..................7007 SPECIAL TOOLS, FIXTURES, AND EQUIPMENT..................9001 10.0...
  • Page 8 Component Maintenance Manual LIST OF ILLUSTRATIONS Figure 2 R12 Refrigerant Flow Schematic....................2001 Figure 3 Brush Removal Details.........................3005 Figure 4 Commutator In Excellent Condition...................5002 Figure 5 Commutator In Serviceable Condition ..................5003 Figure 6 Commutator In Unserviceable Condition ..................5004 Figure 7 Belt Tensioning Reference......................7006 Figure 10001 Compressor Condenser Module Assembly 1250900-4...........10002 Figure 10001 Compressor Condenser Module Assembly (1250900-4) Details ........10003 Figure 10001 Compressor Condenser Module Assembly (1250900-4) Details Cont.

  • Page 9: Introduction

    General introduction (How to Use): 1.1.1 This operating, servicing and component maintenance manual (OSCMM) covers the requirements for field servicing the R-12 air conditioning system for the Pilatus PC12 Aircraft. This document includes component descriptions, servicing, maintenance, inspection requirements and an illustrated parts list.

  • Page 10: Acronyms, Abbreviations, And Symbols

    Component Maintenance Manual 1.1.6 A complete Illustrated Parts Listing (IPL) is supplied as additional documentation (Section 11) to provide service technicians access to exploded views and a parts list while performing maintenance, testing, disassembly and assembly procedures. Refer to the IPL for all figure and item numbers.

  • Page 11: Standard Torque Values

    270-350 IN LBS CONNECTIONS Table 1 Standard Torque Values SUBTASK 21-00-22-99F-004 Documents Required:  Illustrated Parts Listings (IPL) (included with this manual)  Pilatus PC12 Aircraft Maintenance Manual SUBTASK 21-00-22-99F-005 Consumable Products: PART NUMBER DESCRIPTION REMARKS 11602 SEALANT RTV BLACK...

  • Page 12: Description And Operation

    General: 2.1.1 The air conditioning system installed on the Pilatus PC12 Aircraft is not considered a primary flight system. However, an air conditioning system does perform the important function of providing passenger and flight crew comfort during aircraft movement on the ground and while in flight.

  • Page 13: System Description And Operation

    System Description and Operation: 2.2.1 The cabin cooling system installed in the Pilatus PC12 Aircraft operates using a closed vapor cycle concept using refrigerant R12 as the heat absorption media. The R12 air conditioning system cools the aircraft in a similar manner as systems found in an automobile or home.

  • Page 14: System Component Description And Operation

    Component Maintenance Manual SUBTASK 21-00-22-99F-008 System Component Description and Operation: 2.3.1 The R12 air conditioning system installed on the Pilatus PC12 Aircraft uses the following major system components:  Compressor Condenser Module Assembly 1250900-4  Evaporator Module Assembly 1250200-42 (L) /-43 (C,R) 2.3.2...
  • Page 15 Component Maintenance Manual 2.3.3.3 CONDENSER COIL ASSEMBLY: The condenser coil assembly is a copper tube and aluminum fin configuration with 6061-T6 aluminum support brackets. The coil heat rejection is 26,000 BTUH based on a 117°F ambient day. Condenser cooling airflow and coil sizes are based on the design cooling capacity and compressor input horsepower.
  • Page 16 Component Maintenance Manual 2.3.5.2 BLOWER MOTOR: The blower motor (1250210-1) operates on 24 VDC with a current draw of 5 amps and has a design RPM of 5225. The blower motor is a four brush design with an integrated controller and was selected for its efficiency, excellent controllability, long life and low vibration at high speeds.

  • Page 17: Testing And Fault Isolation

    Component Maintenance Manual TESTING AND FAULT ISOLATION TASK 21-00-22-70-801 R12 AIR CONDITIONING SYSTEM COMPONENT – TESTING AND FAULT ISOLATION SUBTASK 21-00-22-99F-009 General: 3.1.1 Testing and Fault Isolation of the R12 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.
  • Page 18 Component Maintenance Manual  Verify that there is a distinct and noticeable change in sound of blower motor when changing from low to high speed positions. This indicates that the cockpit selector switch is functioning properly and that the blower motor is responding accordingly. ...
  • Page 19 Component Maintenance Manual 3.4.3.1 Remove, if required, all panels, doors, shrouds, etc, to gain access to system/component being leak checked (refer to aircraft maintenance manual). 3.4.3.2 Remove, if required, any enclosures or access doors to expose all tubing, hoses, fittings, etc. to the system components. 3.4.3.3 Verify all plumbing connections are tight.
  • Page 20 Component Maintenance Manual 3.4.3.12 Using a wire brush and cleaning solvent, completely remove old thread sealant. Apply a thin layer of thread sealant primer to fitting threads. CAUTION: WHEN APPLYING THREAD SEALANT, TAKE EXTREME CARE TO KEEP SEALANT OFF FIRST 2 OR 3 THREADS. 3.4.3.13 Apply Loctite thread sealant on all male fitting threads sparingly.

  • Page 21: Table 3 Trouble Shooting List

    Component Maintenance Manual NOTE: Refer to Refrigerant Flow (Figure 2) INDICATION PROBABLE CAUSE POSSIBLE SOLUTION A. No System Power 1. Ground power not connected 1. Plug in ground power cart 2. Aircraft power switch off 2. Energize power switch 1. Air conditioner breaker off 1.
  • Page 22 Component Maintenance Manual INDICATION PROBABLE CAUSE POSSIBLE SOLUTION C. System Operates But Does 1. Low refrigerant charge 1.Charge as required Not Cool 2. Overcharged system cutout 2. Reclaim refrigerant as required 3. Failed Compressor 3. Replace 4. Failed Drive Motor 4.

  • Page 23: Table 3 Trouble Shooting List

    Component Maintenance Manual INDICATION PROBABLE CAUSE POSSIBLE SOLUTION 1. Circuit Breaker failed or off 1. Energize or replace G. Compressor Assembly Will Not Operate 2. Relay failed 2. Replace 3. Pressure switch failed 3. Replace 4. Drive motor failed 5. Replace 5.

  • Page 24: Schematic And Wiring Diagrams

    Component Maintenance Manual SCHEMATIC AND WIRING DIAGRAMS 21-00-22-99-801 R12 AIR CONDITIONING SYSTEM SCHEMATIC AND WIRING DIAGRAMS SUBTASK 21-00-22-99-001 R12 Refrigerant Flow Schematic: 4.1.1 The following schematic shows an air conditioning system and its associated components as well as the flow of the R12 refrigerant. Figure 2 R12 Refrigerant Flow Schematic EFFECTIVITY: ALL 21-00-22...

  • Page 25: Disassembly

    Component Maintenance Manual DISASSEMBLY TASK 21-00-22-00-801 R12 AIR CONDITIONING SYSTEM COMPONENT - DISASSEMBLY SUBTASK 21-00-22-99F-010 General: WARNING: SERVICE TECHNICIANS ARE ADVISED TO OBSERVE STANDARD SAFETY PRECAUTIONS, SUCH AS WEARING PERSONAL SAFETY GEAR, TO PREVENT INJURY WHILE PERFORMING SERVICE TO THE UNIT. CAUTION: SERVICE TECHNICIANS MUST PREVENT CONTAMINATION OF INTERNAL SYSTEM PLUMBING DURING ANY SERVICING AND/OR MAINTENANCE OPERATION.

  • Page 26: Compressor Condenser Module Disassembly Procedures

    Component Maintenance Manual 5.1.7 Tools, fixtures, equipment, or consumable items required:  Small hand tools and socket set  Scribe or wire hook  Volt or OHM meter (digital)  Shop air, 40 PSIG max  Respiration mask SUBTASK 21-00-22-00-001 Compressor Condenser Module Disassembly Procedures (refer to Figure 10001): 5.2.1...
  • Page 27 Component Maintenance Manual 5.2.3.2 Slightly loosen the upper compressor mounting bolts. 5.2.3.3 Loosen lower compressor rod end tensioning adjustment nut. 5.2.3.4 Loosen drive motor pulley set screws. 5.2.3.5 Slide lower compressor in towards drive motor, slide drive pulley and belt from motor shaft, while at the same time sliding the drive belt off the compressor pulley.
  • Page 28 Component Maintenance Manual 5.2.6 Removal of Fan 5.2.6.1 Remove motor shaft retaining nut and washer. 5.2.6.2 Loosen fan hub set screw. 5.2.6.3 Slide fan assembly and 2 washers from motor shaft. 5.2.7 Removal of Fan Shroud 5.2.7.1 Remove four shroud mounting screws, washers, and nuts. 5.2.7.2 Cut RTV between shroud and coil using a putty knife.

  • Page 29: Evaporator Module Disassembly Procedures

    Component Maintenance Manual Figure 3 Brush Removal Details SUBTASK 21-00-22-00-002 Evaporator Module Disassembly Procedures (refer to Figure 10002): 5.3.1 Removal of Evaporator Module Assembly 5.3.1.1 Refer to aircraft maintenance manual for removal of Evaporator Module Assembly. 5.3.2 Removal of Expansion Valve 5.3.2.1 Disconnect refrigerant plumbing lines and cap off immediately.

  • Page 30: Cleaning

    Component Maintenance Manual CLEANING TASK 21-00-22-10-801 R12 AIR CONDITIONING SYSTEM COMPONENT – CLEANING PROCEDURES SUBTASK 21-00-22-99F-011 General: 6.1.1 This section details the procedures required to perform certain cleaning functions. The components listed have certain cleaning procedures associated with them, however these procedures are in no way an all encompassing list of what may be required.

  • Page 31: Compressor Condenser Module Cleaning Procedures

    Component Maintenance Manual SUBTASK 21-00-22-10-001 Compressor Condenser Module Cleaning Procedures: 6.2.1 The following components of the Compressor Condenser Module will require periodic cleaning (refer to the Inspection Schedule in section 7 for time intervals). This is in no way an all encompassing list. If at any time during the inspection process a component is found to be dirty, use a soft cloth to remove all contaminants from external surfaces (refer to Figure 10001).
  • Page 32 Component Maintenance Manual  Expansion Valve CAUTION: USE EXTREME CARE TO PREVENT DAMAGE OR BENDING OF COIL FINS 6.3.1.1 EVAPORATOR COIL AIR INLET: The coil fins will, over time, become clogged with dirt, dust and other foreign matter. It is essential that the coil fins remain clear for proper operation of the evaporator module assembly.

  • Page 33: Check (Inspection Schedule)

    Component Maintenance Manual CHECK (INSPECTION SCHEDULE) TASK 21-00-22-21-801 R12 AIR CONDITIOING SYSTEM COMPONENT – INSPECTION SCHEDULE SUBTASK 21-00-22-21-001 Compressor Condenser Module Inspection Schedule: NOTE: This is the recommended visual inspection schedule for the Compressor Condenser Module Assembly. Adherence to this schedule will ensure that all components of the assembly are in accordance with the manufacturer’s specifications and is necessary to detect structural failure, deterioration or damage, and to determine the need for corrective action.

  • Page 34: Figure 4 Commutator In Excellent Condition

    Component Maintenance Manual Figure 4 Commutator In Excellent Condition EFFECTIVITY: ALL 21-00-35 Page 5002 JUNE 15, 2011...

  • Page 35: Figure 5 Commutator In Serviceable Condition

    Component Maintenance Manual Figure 5 Commutator In Serviceable Condition EFFECTIVITY: ALL 21-00-35 Page 5003 JUNE 15, 2011...

  • Page 36: Figure 6 Commutator In Unserviceable Condition

    Component Maintenance Manual Figure 6 Commutator In Unserviceable Condition EFFECTIVITY: ALL 21-00-38 Page 5004 MAY 1/ 2008...

  • Page 37: Evaporator Module Inspection Schedule

    Component Maintenance Manual SUBTASK 21-00-38-21-002 Evaporator Module Inspection Schedule: NOTE: This is the recommended visual inspection schedule for the Evaporator Module Assembly. Adherence to this schedule will ensure that all components of the assembly are in accordance with the manufacturer’s specifications and is necessary to detect structural failure, deterioration or damage, and to determine the need for corrective action.
  • Page 38 Component Maintenance Manual REPAIRS TASK 21-00-22-30-801 R12 AIR CONDITIONING SYSTEM COMPONENT – REPAIR PROCEDURES SUBTASK 21-00-22-99F-012 General: 8.1.1 Refer to Illustrated Parts Listing (IPL) for figure/item numbers (Section 11). WARNING: SERVICE TECHNICIANS ARE ADVISED TO OBSERVE STANDARD SAFETY PRECAUTIONS, SUCH AS WEARING PERSONAL SAFETY GEAR, TO PREVENT INJURY WHILE PERFORMING SERVICE TO THE UNIT.
  • Page 39 Component Maintenance Manual 8.2.1.1 DRIVE BELT/COVER/PULLEYS: The drive belt and the associated pulleys will, over time, become worn or damaged, or may simply be out of alignment. It is essential that the drive belt and the pulleys are in excellent condition for proper operation of the Compressor Condenser Module assembly.
  • Page 40 Component Maintenance Manual 8.2.1.5 ELECTRICAL WIRING: The electrical wiring can, over time, become worn and damaged. If the wiring insulation is showing signs of abrasion or damage of any other kind, replace wiring as required 8.2.1.6 RECEIVER DRYER ASSEMBLY: The receiver dryer assembly can, over time, become damaged.
  • Page 41 (refer to aircraft maintenance manual). Contact Pilatus Aircraft Customer Service for replacement component. If Pilatus cannot support a replacement for the 1134200-42 (L) /-43 (C,R) evaporator, contact Enviro Systems for replacement. Replacement evaporator will be 1134200-60 (L)/-61(R)/-63 (C) and is not compatible with older evaporator 1134200-42/-43.
  • Page 42 Component Maintenance Manual 8.3.1.5 EXPANSION VALVE: The expansion valve can, over time, become damaged and/or not operate correctly. If the expansion valve shows signs of damage or does not function properly, remove and replace (refer to Disassembly, Section 5 and Assembly, Section 9).
  • Page 43 Component Maintenance Manual ASSEMBLY TASK 21-00-22-40-801 R12 AIR CONDITIONING SYSTEM COMPONENT - ASSEMBLY SUBTASK 21-00-22-99F-013 General: 9.1.1 Refer to Illustrated Parts Listing (IPL) during assembly procedures for figure/item numbers (Section 11). WARNING: SERVICE TECHNICIANS ARE ADVISED TO OBSERVE STANDARD SAFETY PRECAUTIONS, SUCH AS WEARING PERSONAL SAFETY GEAR, TO PREVENT INJURY WHILE PERFORMING SERVICE TO THE UNIT.
  • Page 44 Component Maintenance Manual  Shop air, 40 PSIG max  Micrometer  Scribe or wire hook  Inspection mirror  Thermometer, 0-150°F  Flash light or service lamp  Leak check fluid (soapy)  Thread sealant primer  Thread sealant ...
  • Page 45 Component Maintenance Manual 9.2.2 Assembly of Fan / Outlet Shroud 9.2.2.1 After insuring that the shroud/coil mating surfaces have been cleaned in accordance with section 6, apply a 1/8 inch bead of RTV to fan/outlet shroud/coil mating surface. CAUTION: DO NOT TIGHTEN FAN SHROUD MOUNTING SCREWS UNTIL MOTOR AND FAN HAVE BEEN INSTALLED.
  • Page 46 Component Maintenance Manual 9.2.4.8 Tighten drive motor mounting bolts and torque (refer to table 1, Section 1.3 for torque specifications). 9.2.5 Assembly of Compressor 9.2.5.1 Position compressor in mounting bracket and install 3 mounting bolts. Finger tighten bolts only. 9.2.5.2 Rotate lower compressor towards drive motor by adjusting rod end adjustment bolts.
  • Page 47 Component Maintenance Manual 9.2.6.7 Secure drive pulley by tightening drive pulley set screws (refer to table 1, section 1.3 for torque specifications). 9.2.6.8 Tighten and secure compressor mounting bolts, washers, and lock nuts (refer to table 1, section 1.3 for torque specifications). 9.2.7 Assembly of Belt Cover 9.2.7.1...

  • Page 48: Figure 7 Belt Tensioning Reference

    Component Maintenance Manual Figure 7 Belt Tensioning Reference 9.2.9 Assembly of Power Relay 9.2.9.1 Carefully slide power relay into position and attach using mounting hardware. 9.2.9.2 Connect electrical connections and install boots for protection. 9.2.10 Assembly of Hour Meter 9.2.10.1 Carefully slide hour meter into hour meter opening and secure with attaching hardware (refer to table 1, Section 1.3 for torque specifications).
  • Page 49 Component Maintenance Manual SUBTASK 21-00-22-40-002 Evaporator Module Assembly Procedures (refer to Figure 10002): 9.3.1 Assembly of Expansion Valve CAUTION: APPLY THREAD SEALANT SPARINGLY TO MALE FITTING THREADS STAYING CLEAR OF FIRST 2-3 THREADS. 9.3.1.1 Set new valve adjustment screw to same position as failed valve. 9.3.1.2 Using a wire brush and cleaning solvent, completely remove old thread sealant.
  • Page 50 Component Maintenance Manual SPECIAL TOOLS, FIXTURES, AND EQUIPMENT TASK 21-00-22-99F-803 10.0 SPECIAL TOOLS/EQUIPMENT SUBTASK 21-00-22-99F-014 10.1 General: 10.1.1 This section describes the necessary tools and test equipment required to perform maintenance, functional testing, troubleshooting, and repair procedures. Equivalent test equipment may be substituted only if it meets the listed equipment specifications. ...
  • Page 51 Component Maintenance Manual  Straight Edge  Measuring Device  Micrometer  Scribe or Wire Hook  Volt-OHM Meter  Belt Tensioning Tool T1134610  Spring Scale Wagner FDK 10 EFFECTIVITY: ALL 21-00-22 Page 9002 JULY 21, 2011...
  • Page 52 Component Maintenance Manual ILLUSTRATED PARTS LIST TASK 21-00-22-98-801 11.0 R12 AIR CONDITIONING SYSTEM COMPONENT ILLUSTRATED PARTS LISTING SUBTASK 21-00-22-99F-015 11.1 Introduction: 11.1.1 This Illustrated Parts Listing (IPL) is intended for use during testing and isolation, disassembly, cleaning, check (inspection), repair, assembly, and issuing the replaceable equipment components as well as in identification of new and reclaimed parts.

  • Page 53: Figure 10001 Compressor Condenser Module Assembly 1250900-4

    Component Maintenance Manual Figure 10001 Compressor Condenser Module Assembly 1250900-4 EFFECTIVITY: ALL 21-00-22 Figure 10001 Page 10002 JULY 21, 2011...

  • Page 54: Figure 10001 Compressor Condenser Module Assembly (1250900-4) Details

    Component Maintenance Manual FIG. ITEM PART NUMBER NOMENCLATURE UNITS ASSY. 10001-10C 1250104 DC MOTOR -11C 5/16-24X3/4H BOLT -12C MS35333-41 WASHER MOTOR BRUSH(SET CONTAINS 4 BRUSH -13C 1251171 PAIRS) 1250128 POWER RELAY -11B ¼-28X1/2H BOLT -12B ¼-28X1H BOLT -13B 21FK-428 -14B MS35333-40 FLAT WASHER -15B...

  • Page 55: Figure 10001 Compressor Condenser Module Assembly (1250900-4) Details Cont

    Component Maintenance Manual 100A 1250509 SHROUD -101 10-32X3/8IHW SCREW -102 NAS1149F0332P FLAT WASHER (AN960-10L) -103 409-1032Z 110A 1250502-3 CONDENSER SUPPORT BRACKET -111 AN500-A8-6 SCREW -112 NAS1149FN832P FLAT WASHER (AN960-8) -113 MS35265-30 SCREW -114 NAS1149FN632P FLAT WASHER (AN960-6) 120C 1250703-1 HOUR METER -121 AN500-6-6 SCREW...

  • Page 56: Figure 10002 Evaporator Module Assembly 1250200-42 (L) /-43 (C,R)

    Component Maintenance Manual Figure 10002 Evaporator Module Assembly 1250200-42 (L) /-43 (C,R) EFFECTIVITY: ALL 21-00-22 Figure 10002 Page 10005 JULY 21, 2011...

  • Page 57: Figure 10002 Evaporator Module Assembly (1250200-42/-43) Details

    Component Maintenance Manual FIG. ITEM PART NUMBER NOMENCLATURE UNITS ASSY. 10002-10A 1250218 EXPANSION VALVE (-42) 1250218-1 EXPANSION VALVE (-43) 1250540-11 AIR FILTER 190940 VELCRO (HOOK) (2.6 FT.) 190911 VELCRO (LOOP) (2.6 FT.) BLOWER MOTOR SHROUD ESCUTCHEON Figure 10002 Evaporator Module Assembly (1250200-42/-43) Details - ITEMS NOT ILLUSTRATED N/P ITEMS NOT PROCURABLE EFFECTIVITY: ALL...

  • Page 58: Table 4 Typical Operating Values

    Component Maintenance Manual SPECIAL PROCEDURES TASK 21-00-22-82-801 12.0 SPECIAL PRODECURES SUBTASK 21-00-22-82-001 12.1 Expansion Valve Alignment: 12.1.1 The expansion valve is set at the factory, but there may be times when it must be adjusted to assure proper refrigerant flow at the desired evaporating temperature; for example, excessive pressure drop for long suction line runs.
  • Page 59 Component Maintenance Manual 12.1.4 Gain access to the Evaporator Coil Assembly (refer to the aircraft maintenance manual for removal of access panels and other hardware that might need to be removed) 12.1.5 Remove all shrouds, covers or enclosures which prevent access to the evaporator expansion valve adjustment knob.
  • Page 60 Component Maintenance Manual 12.2.5 Allow system to stabilize, recheck the evaporator outlet temperatures and repeat adjustment procedure if required. Evaporator outlet temperatures should be within 1-3° of each other. NOTE: Proper evaporator balancing should not result in a change of the compressor suction pressure. Verify system pressures are typical values as shown in table 5.
  • Page 61 Component Maintenance Manual 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. 12.4.7 If bearings rotate smoothly and are good, reinstall belt and brushes (refer to Assembly, Section 9).
  • Page 62 Component Maintenance Manual 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.
  • Page 63 Component Maintenance Manual SERVICING TASK 21-00-22-60-801 13.0 R12 AIR CONDITIONING SYSTEM SERVICING PROCEDURES SUBTASK 21-00-22-99F-016 13.1 General: 13.1.1 Reclaiming the system (R12) refrigerant charge is required on systems before system removal, after an accidental line break, component failure or when the system has excessive leaks.
  • Page 64 Component Maintenance Manual  Reclaim/ Recycle Cart (R12)  Hose adapter (1/2 in, male acme to ¼ female flare) SUBTASK 21-00-22-60-001 13.2 Evacuating The System (R12): NOTE: The system must be evacuated for a minimum of 45 minutes to remove air and moisture which can cause the system to have less than optimal performance.

  • Page 65: Table 5 Refrigerant Charge

    Refer to the reclaim/recycle equipment manufacturer’s instruction manual for recovery unit handling and operation. Refrigerant charges for the system are as follows in Table 5. Aircraft Model Refrigerant Charge (lbs.) Pilatus PC12 2.0 lbs Table 5 Refrigerant Charge SUBTASK 21-00-22-60-003 13.4 Flushing The System (R12): 13.4.1 System flushing is required only when the system has experienced a catastrophic failure of...
  • Page 66 Component Maintenance Manual 13.4.5 Connect certified reclaim charging and recycle cart manifolds to system service ports (ensure reclaim cart is properly grounded) and recover remaining refrigerant (refer to the reclaim equipment manufacturer’s instruction manual for recovery unit handling and operation). 13.4.6 Remove expansion valve and install fittings and hoses to close loop after valve removal.
  • Page 67 Component Maintenance Manual STORAGE TASK 21-00-22-55-801 14.0 COMPRESSOR CONDENSER MODULE ASSEMBLY STORAGE PROCEDURES SUBTASK 21-00-22-99F-017 14.1 General: 14.1.1 This section defines the procedures and requirements necessary if the Compressor assembly is to be stored and not installed onto aircraft immediately. In addition, this section defines the procedures and requirements for operation on the aircraft during the cold winter months when the system is not typically needed or used.
  • Page 68 Component Maintenance Manual 14.2.4.2 Drain old oil into measuring cup to verify amount of oil being replaced. CAUTION: ONLY AN ENVIRO APPROVED TYPE OF OIL MAY BE USED IN THIS TYPE OF COMPRESSOR. CAUTION: DO NOT OVERFILL COMPRESSOR WITH OIL OR SYSTEM PERFORMANCE WILL BE AFFECTED.
  • Page 69 Component Maintenance Manual 14.4.1.3 If the component is removed from the original packaging and is not installed on the aircraft immediately, it is desirable that it be repackaged using the original Enviro Systems packaging. 14.4.1.4 If the component is removed from the original packaging and is not installed on the aircraft immediately and the original packaging is not available for repackaging, ensure that the component is packaged in the following manner.

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