PRATT & WHITNEY CANADAMAINTENANCE MANUAL MANUAL PART NO. 3043512 LIST OF EFFECTIVE PAGES CHAPTER SECTION PAGE DATE LEP 1 2 blank Nov 21/2008 Nov 21/2008 Contents 1 2 Nov 21/2008 Nov 21/2008 74-20-00 Description and Operation 1 2 Nov 26/2004 Nov 26/2004 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 Nov 21/2008 74-20-00 Maintenance Practices 74-20-04 Description and Operation 74-20-04 Maintenance Practices 1 2 blank Nov 26/2004 Nov 26/2004 201 202 blank 203 deleted 204 deleted 205 deleted 206 deleted Nov 26/2004 Nov 26/2004 P&WC Proprietary Information. Subject to the restrictions on the title page. 74-20 LEP Page 1/2 Nov 21/2008 PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. 3043512 TABLE OF CONTENTS SUBJECT PAGE IGNITION CABLES AND SPARK IGNITERS - DESCRIPTION AND OPERATION 1. Description and Operation 74-20-00 1 IGNITION CABLES AND SPARK IGNITERS - MAINTENANCE PRACTICES 74-20-00 1. General 201 2. Consumable Materials 201 3. Special Tools 201 4. Fixtures, Equipment and Supplier Tools 201 5. Removal/Installation 202 A. Removal of Spark Ignition Cables 202 B. Removal of PT6A-114/-114A Spark Ignition Cables 202 C. Removal of PT6A - 135A Spark Ignition Cables 203 D. Installation of Spark Ignition Cables 203 E. Installation of PT6A-114/-114A Spark Ignition Cables 207 F. Installation of PT6A-135A Spark Ignition Cables 212 6. 7. 8. G. Removal of Spark Igniters 213 H. 213 Installation of Spark Igniters Cleaning/Painting 215 A. Spark Igniters 215 B. Ignition Cables 215 Inspection/Check 216 A. Ignition Cables 216 B. Spark Igniters 216 Approved Repairs 218 A. Cable Braiding Minor Damage 218 B. Cable Braiding Major Damage 218 P&WC Proprietary Information. Subject to the restrictions on the title page. 74-20 CONTENTS Page 1 Nov 21/2008 Equipment and Supplier Tools 201 5. Inspection/Check 201 P&WC Proprietary Information. 3043512 TABLE OF CONTENTS SUBJECT PAGE IGNITION CABLES AND SPARK IGNITERS . Removal/Installation 201 6. Cleaning/Painting 201 7. Special Tools 201 4.MAINTENANCE PRACTICES 74-20-04 1. 220 Ignition Cables SPARK IGNITERS . Adjustment/Test 220 A. 74-20 CONTENTS Page 2 Nov 21/2008 . General 201 2.DESCRIPTION AND OPERATION 1. 74-20-00 Description and Operation 74-20-04 1 SPARK IGNITERS . Fixtures. Consumable Materials 201 3.MAINTENANCE PRACTICES (Cont’d) 9. Subject to the restrictions on the title page.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. Although parts may thus differ in detail appearance. As this potential increases. Mounting flanges for attachment to the engine fireseal mount rings are brazed onto the flexible braiding. high energy discharges between the electrodes. The electrical potential developed by the ignition exciter is applied across the gap between the central conductor and the igniter shell (ground). 3043512 IGNITION CABLES AND SPARK IGNITERS . 74-20-00 Page 1 IGNITION CABLES AND SPARK IGNITERS . the functioning is identical and they are fully interchangeable. a small current passes across the semi-conducting material. Each lead assembly consists of an electrical lead contained in a flexible metal braiding. Coupling nuts at each end of the assembly facilitate connection to the respective connectors on the ignition exciter and spark igniter. Fig. The latest configurations feature air cooling holes for greater durability. located at the 4 and 9 o’clock positions on the gas generator case and adjacent to the fuel manifold.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. This current increases until the air between the central conductor and the shell ionizes. The spark always occurs somewhere in the annular space between the central conductor and shell. are in the form of a double-ended.DESCRIPTION AND OPERATION Nov 26/2004 . Description and Operation (Ref.DESCRIPTION AND OPERATION 1. The spark igniters. Spark igniters are available under several different part numbers. to cover parts obtained from different sources. threaded plug with a central positive electrode enclosed in an annular semi-conducting material. 1) The two individual ignition cable assemblies carry the electrical energy output from the ignition exciter to the engine mounted spark igniters. When ionization occurs. 3043512 POWER TURBINE STATOR HOUSING COMBUSTION CHAMBER LINER SPARK IGNITER C6292 Spark Igniter Installation (Typical) .DESCRIPTION AND OPERATION Nov 26/2004 .PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO.Cross Section Figure 1 74-20-00 Page 2 IGNITION CABLES AND SPARK IGNITERS . Antiseize Alcohol. Name PWC05-058 PWC05-066A PWC06-005B PWC11-014 PWC11-031 PWC11-032 Solder. Insulating Lubricant. B. Tin-Alloy Lubricant. Fluorocarbon Alcohol. 3. Antiseize Compound. and will not be specified in instructions. Item No. Isopropyl Cleaner. 74-20-00 IGNITION CABLES AND SPARK IGNITERS . Fluorocarbon DELETED Compound. Engine Solvent. 0. Engine Solvent.MAINTENANCE PRACTICES Page 201 Nov 21/2008 . Tin-Alloy Tape. Consumable Materials The consumable materials listed below are used in the following procedures. Equipment and Supplier Tools Not Applicable P&WC Proprietary Information. Maintenance personnel should make reference to the INTRODUCTION section and Chapter 70-00-00 STANDARD PRACTICES of this manual to familiarize themselves with general procedures. Subject to the restrictions on the title page. Degreaser Item No. Degreaser Special Tools Not Applicable 4. Fixtures.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. Name PWC05-058 PWC06-005B PWC06-009 PWC06-023 PWC06-036 PWC06-036A PWC11-014 PWC11-031 PWC11-032 Solder. 3043512 IGNITION CABLES AND SPARK IGNITERS . 2. C. Lockwire used shall comply with specification AMS5687. heat and corrosion resistant steel wire MS9226-03.MAINTENANCE PRACTICES 1.025 inch diameter. Isopropyl Cleaner. Antiseize Compound. Install suitable protective caps/covers over all disconnected tubes/lines and component openings. General A. Subject to the restrictions on the title page. and remove the clamps (5). and the clamps (14 and 16) from the brackets (13 and 15) respectively. (d) Remove the self-locking nuts and bolts securing the mounting flanges of each ignition cable at the respective locations on the center and rear fireseals. ALWAYS USE INSULATED TOOLS TO REMOVE THE CABLE COUPLING NUTS.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. and the clamps (8 and 9) from the brackets (7 and 10) respectively. AND THE SYSTEM HAS BEEN INOPERATIVE FOR AT LEAST SIX MINUTES BEFORE REMOVING ANY IGNITION COMPONENTS. (3) Detach the ignition cables (18) from the engine: (a) Views A and C: Remove the self-locking nuts. A. DO NOT TOUCH THE OUTPUT CONNECTORS OR COUPLING NUTS WITH BARE HANDS. (b) View C: Remove the self-locking nuts and bolts. 74-20-00 IGNITION CABLES AND SPARK IGNITERS . (4) B. and forward from the rear fireseal. 202) (1) Disconnect the power input cable from the receptacle on the ignition exciter. MAKE SURE THE IGNITION IS SWITCHED OFF. ALWAYS DISCONNECT THE COUPLING NUTS AT THE IGNITION EXCITER END FIRST. and remove the clamp (11) from the bracket (12). Cap/cover cable connections. (2) Disconnect the ignition cables (18) from the receptacles on the ignition exciter and the spark igniters on the gas generator case. and remove the clamps (2 and 3) from the brackets (1 and 4) respectively. bolts (and washers if applicable). and the clamps (16) from the brackets (17) at the rear fireseal. at the center fireseal. Remove the cables (6) by withdrawing rearward from the center fireseal. Removal of Spark Ignition Cables (Ref. Removal of PT6A-114/-114A Spark Ignition Cables (Ref. and remove the clamps (1 and 3) from the brackets (2 and 4) respectively. Removal/Installation WARNING: RESIDUAL VOLTAGE IN THE IGNITION EXCITER MAY BE DANGEROUSLY HIGH. 201) (1) Disconnect the power input cable from the receptacle on the ignition exciter. Cap/cover cable connections. (c) View D: Remove the self-locking nuts and bolts. Remove the brackets (17) at the rear fireseal. (3) Detach the ignition cables (6) from the engine: (a) View A and B: Remove the self-locking nuts and bolts. the clamps (13) and back plate (14) from the clamps (15) on the fuel lines.MAINTENANCE PRACTICES Page 202 Nov 21/2008 . Fig. P&WC Proprietary Information. at the center fireseal. (2) Disconnect the ignition cables (6) from the receptacles on the ignition exciter and the spark igniters on the gas generator case. Cap/cover cable connections. Fig. 3043512 5. at the center fireseal. P&WC Proprietary Information. the clamps (11) from the brackets (12) at the rear fireseal. Cap/cover cable connections. and remove the clamp (15) from the bracket (16). (b) Detail C : Remove the self-locking nuts. Remove the brackets (12) at the rear fireseal. and remove the clamp (9) from the bracket (10). (d) Detail E and Section F-F (For Post-SB1640 Engines): Remove bolt (20). 74-20-00 IGNITION CABLES AND SPARK IGNITERS . and forward from the rear fireseal. (d) Remove the self-locking nuts and bolts securing the mounting flanges of each ignition cable at the respective locations on the center and rear fireseals. and remove the clamps (5).135A Spark Ignition Cables (Ref. Remove the cables (6) by withdrawing rearward from the center fireseal. Remove the cables (18) by withdrawing rearward from the center fireseal. 3043512 (b) View D: Remove the self-locking nuts. Cap/cover cable connections. (c) Detail C (For Pre-SB1640 Engines): Remove bolt (20). the clamps (5) from the brackets (6) at the rear fireseal and the clamp (11) from the bracket (12). (e) Detail D: Remove the self-locking nuts and bolts. nut (22) and clamp (17). Cap/cover cable connections. (c) View B: Remove the self-locking nut and bolt. Remove the brackets (6) at the rear fireseal. and remove the clamps (2 and 3) from the brackets (1 and 4) respectively. and the clamps (8 and 9) from the brackets (7 and 10) respectively. Remove the self-locking nuts and bolts securing the mounting flanges of each ignition cable at the respective locations on the center and rear fireseals. the clamp (14) from the clamp (13) on the fuel line. Fig. and forward from the rear fireseal. Removal of PT6A . (2) Disconnect the ignition cables (6) from the receptacles on the ignition exciter and the spark igniters on the gas generator case. (3) Detach the ignition cables (6) from the engine: (a) View A and B: Remove the self-locking nuts and bolts. 201) (1) Install and connect the ignition cables (6): (a) Pass the elbowed connector of each cable through the center fireseal (from the rear side) and route to the respective spark igniter at the 4 and 9 o’clock positions on the gas generator case. 203) (1) Disconnect the power input cable from the receptacle on the ignition exciter. washer (21). Installation of Spark Ignition Cables (Ref. bolts (and washers if applicable). Subject to the restrictions on the title page.MAINTENANCE PRACTICES Page 203 Nov 21/2008 . Fig. nut (22) and the clamp (17) from the bracket (18). (4) C.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. bolts (and washers if applicable). the clamp (8) from the clamp (7) on the fuel line. (f) (4) D. Remove bolt (23) and bracket (19). and remove the clamps (17). MAINTENANCE PRACTICES Page 204 Nov 21/2008 . 74-20-00 IGNITION CABLES AND SPARK IGNITERS . Subject to the restrictions on the title page.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. 3043512 7 9 1 3 2 8 10 4 DETAIL A DETAIL 18 B D A C B 16 11 17 13 13 20 5 14 19 16 12 6 15 DETAIL 15 17 C DETAIL D C6978A Removal/Installation of Spark Ignition Cables Figure 201 P&WC Proprietary Information. 9. 20.MAINTENANCE PRACTICES Page 205 Nov 21/2008 . 13. 7. 74-20-00 IGNITION CABLES AND SPARK IGNITERS . (d) View D: Secure the cables with the clamps (5). bolt and self-locking nut. 2. bolts and self-locking nuts. 3043512 Key to Figure 201 1. 5. 2 To the clamps (15) on the fuel lines with the back plate (14). (b) Views A and B: Secure the cables to the brackets (1. 17. 7 and 10) with the respective clamps (2. 18. Subject to the restrictions on the title page. self-locking nuts and bolts. (c) View C: Secure the cables: 1 To the brackets (17) at the rear fireseal with the clamps (16). 3 Secure the right-hand cable to the bracket (12) on the gas generator case with the clamp (11). 14.) Support Bracket (b) Connect the cables to the respective spark igniter.) Rear Fireseal (Ref. bolt and self-locking nut. 11. clamps (13). 8. Tighten the coupling nuts fingertight plus 45 degrees. 4. Bracket Clamp Clamp Bracket Clamp Ignition Cable Bracket Clamp Clamp Bracket Clamp Bracket Clamp Back Plate Clamp Clamp Bracket Center Fireseal (Ref. 19. 6. The bolt heads are to be on the air inlet side of the fireseals. 16. bolts and self-locking nuts.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. 15. 3. 12. P&WC Proprietary Information. 3. 4. (2) Secure the ignition cables (6) to the engine: (a) Secure the mounting flanges to each cable and the brackets (17) (at the rear fireseal) to the respective fireseal with the bolts and self-locking nuts. The upper bolts also secure the support bracket (20) to the rear fireseal. 10. 8 and 9). PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. Subject to the restrictions on the title page. 74-20-00 IGNITION CABLES AND SPARK IGNITERS .MAINTENANCE PRACTICES Page 206 Nov 21/2008 .PT6A-114/-114A Engines Figure 202 P&WC Proprietary Information. 3043512 1 17 4 18 A 2 3 B 18 A B D C 5 18 12 11 14 13 10 16 15 9 6 8 7 D C C37164 Removal/Installation of Spark Ignition Cables . 2. 7. 10. 17. 3. 74-20-00 IGNITION CABLES AND SPARK IGNITERS . 15. 5. 9. DO NOT APPLY LUBRICANT ON ANY CABLES HAVING TEFLON INSULATED SLEEVES. 16. Screw the coupling nuts onto the mating threads. (3) Using fluorocarbon dry spray lubricant (PWC06-005B). 11. (4) Connect the ignition cables to the respective spark igniters and connectors on the ignition exciter. 4. 12. 6. FERRULES OR IGNITER PLUGS TO TURN WHEN SCREWING ON THE COUPLING NUTS. CAUTION: DO NOT ALLOW THE BRAIDING. making sure that no binding occurs between the nut and cable. 18. 8.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. CAUTION: UNDER NO CIRCUMSTANCE IS LUBRICANT CONTAINING GREASE OR SILICONE OR LUBRICANTS SUCH AS PETROLATUM TO BE USED ON ANY IGNITION COMPONENT OR ALLOWED TO COME IN CONTACT WITH CENTRAL CONDUCTORS OF CABLES. 3043512 Key to Figure 202 1. lightly spray the insulated end of the cables having rubber insulated sleeves. Subject to the restrictions on the title page. 14. Loop Clamp Bracket Loop Clamp Bracket Loop Clamp Bracket Loop Clamp (fuel line) Loop Clamp Bracket Loop Clamp Loop Clamp Bracket Bracket Loop Clamp Bracket Loop Clamp Loop Clamps Ignition Cables (e) Tighten all self-locking nuts 36 to 40 lb. 202) (1) Install and connect the ignition cables (18) as follows: P&WC Proprietary Information. Tighten the nuts fingertight plus 45 degrees.in.MAINTENANCE PRACTICES Page 207 Nov 21/2008 . 13. Installation of PT6A-114/-114A Spark Ignition Cables (Ref. (5) Connect the power input cable to the receptacle on the ignition exciter. CONTACT WITH CONDUCTORS MAY RESULT IN A HIGH RESISTANCE PATH WHICH COULD GENERATE HEAT AND OXIDATION. E. Secure the coupling nuts with lockwire. Fig. MAINTENANCE PRACTICES Page 208 Nov 21/2008 . 3043512 A 1 E D C 3 2 4 DETAIL A 7 B 9 8 10 22 20 11 DETAIL B PRE−SB1640 18 17 5 16 12 14 6 13 15 DETAIL DETAIL C D C147780 Removal/Installation of Spark Ignition Cables .PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. 74-20-00 IGNITION CABLES AND SPARK IGNITERS .PT6A-135A Engines Figure 203 (Sheet 1 of 2) P&WC Proprietary Information. Subject to the restrictions on the title page. 15. 4. 74-20-00 IGNITION CABLES AND SPARK IGNITERS . 16. 5. 19. 18.MAINTENANCE PRACTICES Page 209 Nov 21/2008 . 20. 2. 22. 13. 12. 6. 21.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. 11. 23. Bracket Clamp Clamp Bracket Clamp Ignition Cable Bracket Clamp Clamp Bracket Clamp Bracket Clamp Clamp Bracket Clamp Clamp Bracket (Pre-SB1640) Bracket (Post-SB1640) Bolt Washer (Post-SB1640) Nut Bolt P&WC Proprietary Information. 3. 8. 10. 17. Subject to the restrictions on the title page. 3043512 Key to Figure 203 1. 14. 7. 9. MAINTENANCE PRACTICES Page 210 Nov 21/2008 .) 23 17 22 19 POST−SB1640 20 21 SECTION F−F C147781 Removal/Installation of Spark Ignition Cables .PT6A-135A Engines Figure 203 (Sheet 2) P&WC Proprietary Information. Subject to the restrictions on the title page. 3043512 F F OIL SCAVENGE TUBE (REF.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. 74-20-00 IGNITION CABLES AND SPARK IGNITERS .) DETAIL E POST−SB1640 ELBOW (REF. (c) View D: Secure the cables as follows: 1 To the brackets (6) at the rear fireseal with clamps (5). 2 To clamps (7) on the fuel line with clamp (8). (2) Secure the ignition cables (18) as follows: (a) Secure the mounting flanges of each cable and the brackets (6) (at the rear fireseal) to the respective fireseal with bolts. bolt and self-locking nut. 74-20-00 IGNITION CABLES AND SPARK IGNITERS . (e) Tighten all self-locking nuts 36 to 40 lb. 3. and self-locking nuts. 13 and 15) with the respective clamps (1. bolts (and washers if applicable). Secure the coupling nuts with lockwire. (3) Using fluorocarbon dry spray lubricant (PWC06-005B). 14 and 16). bolts and self-locking nuts. Tighten the coupling nuts fingertight plus 45 degrees. CAUTION: UNDER NO CIRCUMSTANCE IS LUBRICANT CONTAINING GREASE OR SILICONE OR LUBRICANTS SUCH AS PETROLATUM TO BE USED ON ANY IGNITION COMPONENT OR ALLOWED TO COME IN CONTACT WITH CENTRAL CONDUCTORS OR CABLES. The bolt heads are to be on the air inlet side of the fireseals.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. (b) Views A and C: Secure the cables to the brackets (2. making sure that no binding occurs between the nut and cable. CAUTION: DO NOT ALLOW THE BRAIDING. (4) Connect the ignition cables to the respective spark igniters and connectors on the ignition exciter. CONTACT WITH CONDUCTORS MAY RESULT IN A HIGH RESISTANCE PATH WHICH COULD GENERATE HEAT AND OXIDATION. Subject to the restrictions on the title page. 3 Secure the right hand cable to the bracket (9) on the gas generator case with the clamp (10). 3043512 (a) Pass the elbowed connector of each cable through the center fireseal (from the rear side) and route to the respective spark ignition at the 4 and 9 o’clock positions on the gas generator case. DO NOT APPLY LUBRICANT ON ANY CABLES HAVING TEFLON INSULATED SLEEVES. P&WC Proprietary Information. bolt and self-locking nut. (d) View B: Secure the cables with the clamp (17). bolts and self-locking nuts. (5) Connect the power input cable to the receptacle on the ignition exciter. 4.MAINTENANCE PRACTICES Page 211 Nov 21/2008 . lightly spray the insulated end of the cables having rubber insulated sleeves. FERRULES OR IGNITER PLUGS TO TURN WHEN SCREWING ON THE COUPLING NUTS. self-locking nuts (and washers if applicable). Tighten the nuts fingertight plus 45 degrees.in. (b) Connect the cables to the respective spark igniter. Screw the coupling nuts onto the mating threads. in. washer (21) and nut (22). 74-20-00 IGNITION CABLES AND SPARK IGNITERS .PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. (c) View C: Secure the cables as follows: 1 To the brackets (12) at the rear fireseal with clamps (11). bolt and self-locking nut. (4. 3 Attach the ignition cable to the bracket (19) with the clamp (17). Fig. Subject to the restrictions on the title page.MAINTENANCE PRACTICES Page 212 Nov 21/2008 . (d) View C (For Pre-SB1640 Engines): Install clamp (17) on bracket (18) with bolt (20) and nut (22). Tighten the coupling nuts fingertight plus 45 degrees. Detail D: Secure the cables with the clamps (5). 4. (e) View E and Section F-F (For Post-SB1640 Engines): (f) 1 Install the short end of the bracket (19) at the elbow of the oil scavenge tube with the bolt (23).72 to 4. 3043512 F.52 Nm). Installation of PT6A-135A Spark Ignition Cables (Ref. bolts and self-locking nuts. Tighten the bolt (23) 24 to 36 lb.in. (2. 8 and 9). The bolt heads are to be on the air inlet side of the fireseals. P&WC Proprietary Information.07 to 4. bolt (20). 7 and 10) with the respective clamps (2. self-locking nuts and bolts. bolt and self-locking nut. (b) Views A and B: Secure the cables to the brackets (1. 3 Secure the right hand cable to the bracket (15) on the gas generator case with the clamp (16). 2 To clamps (13) on the fuel line with clamp (14).in. Tighten the bolt (20) 36 to 40 lb. (2) Secure the ignition cables (6) to the engine: (a) Secure the mounting flanges to each cable and the brackets (12) (at the rear fireseal) to the respective fireseal with the bolts and self-locking nuts. 2 Lockwire the bolt (23). 3. bolts and self-locking nuts. (g) Tighten all self-locking nuts 36 to 40 lb. 203) (1) Install and connect the ignition cables (6): (a) Pass the elbowed connector of each cable through the center fireseal (from the rear side) and route to the respective spark igniter at the 4 and 9 o’clock positions on the gas generator case. (b) Connect the cables to the respective spark igniter.07 Nm). (4) Remove the copper gasket (1) from each spark igniter. (3) Remove the spark igniters (2) from the gas generator case. Secure the coupling nuts with lockwire. CAUTION: DO NOT ALLOW THE BRAIDING. Tighten the nuts fingertight plus 45 degrees. 72-30-04. FERRULES OR IGNITER PLUGS TO TURN WHEN SCREWING ON THE COUPLING NUTS. ALWAYS USE INSULATED TOOLS TO REMOVE THE CABLE COUPLING NUTS. 204) WARNING: RESIDUAL VOLTAGE IN THE IGNITION EXCITER MAY BE DANGEROUSLY HIGH. 204) (1) Install a new copper gasket (1) on each spark igniter (2). ALWAYS DISCONNECT THE COUPLING NUTS AT THE IGNITION EXCITER END FIRST. Subject to the restrictions on the title page. G. Screw the coupling nuts onto the mating threads. chase igniter boss threads (Ref. Installation of Spark Igniters (Ref. CAUTION: WHEN UNSCREWING THE COUPLING NUTS. DO NOT ALLOW THE BRAIDING. (4) Connect the ignition cables to the respective spark igniters and connectors on the ignition exciter. making sure that no binding occurs between the nut and cable. 74-20-00 and 74-20-04). (3) Using fluorocarbon dry spray lubricant (PWC06-005B). (1) Isolate the power from the ignition system. FERRULES OR IGNITER PLUGS TO TURN AT THE SAME TIME. H. Removal of Spark Igniters (Ref.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. DO NOT TOUCH THE OUTPUT CONNECTORS OR COUPLING NUTS WITH BARE HANDS. 74-20-00 IGNITION CABLES AND SPARK IGNITERS . 3043512 CAUTION: UNDER NO CIRCUMSTANCE IS LUBRICANT CONTAINING GREASE OR SILICONE OR LUBRICANTS SUCH AS PETROLATUM TO BE USED ON ANY IGNITION COMPONENT OR ALLOWED TO COME IN CONTACT WITH CENTRAL CONDUCTORS OF CABLES. (2) Remove the coupling nuts of the ignition cables from the respective spark igniters (Ref. Approved Repairs). (2) If necessary.MAINTENANCE PRACTICES Page 213 Nov 21/2008 . DO NOT APPLY LUBRICANT ON ANY CABLES HAVING TEFLON INSULATED SLEEVES. (5) Connect the power input cable to the receptacle on the ignition exciter. Fig. Fig. lightly spray the insulated end of the cables having rubber insulated sleeves. MAKE SURE THE IGNITION IS SWITCHED OFF. P&WC Proprietary Information. AND THE SYSTEM HAS BEEN INOPERATIVE FOR AT LEAST SIX MINUTES BEFORE REMOVING ANY IGNITION COMPONENTS. CONTACT WITH CONDUCTORS MAY RESULT IN A HIGH RESISTANCE PATH WHICH COULD GENERATE HEAT AND OXIDATION. 74-20-00 IGNITION CABLES AND SPARK IGNITERS . Subject to the restrictions on the title page. 3043512 SPARK IGNITER 1 SPARK IGNITER VIEW FROM REAR OF ENGINE 2 C63B Removal/Installation of Spark Igniters Figure 204 P&WC Proprietary Information.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO.MAINTENANCE PRACTICES Page 214 Nov 21/2008 . (PWC11-014). WEAR PROTECTIVE CLOTHING AND USE IN PROPERLY VENTILATED AREA.in.060 in. DO NOT REMOVE CARBON FROM THE ELECTRODES OR FROM ANNULAR GAP AREAS. (3) Dry using clean. Spark igniter threads must not be lubricated with oil. (3) Apply a thin coat of anti-seize compound (PWC06-023 or PWC06-036 or PWC06-036A) to spark igniter threads. loosen to zero. NOTE: 6. dia. P&WC Proprietary Information. clean the inside surface of the terminal well and contact pin. CAUTION: DO NOT IMMERSE CABLE IN ALCOHOL. (4) Install spark igniters in bosses at 4 o’clock and 9 o’clock positions on gas generator case.in.050 to 0. Tighten igniters 300 lb. CARBON DEPOSITS IN THE GAP AREA ACT AS AN AID IN IGNITER OPERATION. dry compressed air. dry compressed air. Spark Igniters CAUTION: DO NOT CLEAN THE NOSE (FIRING) END OF THE IGNITERS.) dampened with isopropyl alcohol (PWC11-014).MAINTENANCE PRACTICES Page 215 Nov 21/2008 . 3043512 Key to Figure 204 1. Ignition Cables CAUTION: ISOPROPYL ALCOHOL.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. (5) Insert central conductor of ignition cable into respective spark igniter. (1) Using a felt swab soaked in isopropyl alcohol (PWC11-014) or engine cleaner (PWC11-031). and retighten 300 to 360 lb. B. (1) Clean inside of cable terminal with a wood stick (0. 74-20-00 IGNITION CABLES AND SPARK IGNITERS . KEEP AWAY FROM IGNITION SOURCE. (2) Dry using clean. Copper Gasket Spark Igniter CAUTION: APPLY COMPOUND TO IGNITER THREADS OR IGNITER BOSS THREADS ONLY. 2. IS FLAMMABLE AND HARMFUL TO EYES AND BREATHING PASSAGES. Subject to the restrictions on the title page. Cleaning/Painting A. (2) Spray isopropyl alcohol (PWC11-014) in terminal to remove any dirt or foreign material.. 3000 N/A ** 3031213 Bendix: 10-390667-1 0. (b) Contact must hold a 0.015 inch. Retention Rest Tool Specification B. Table 201).: 5611760 0. 74-00-00. DIM. (3) Do a functional test on acceptable and replacement spark igniters (Ref. Wear is acceptable to a depth of 0. Subject to the restrictions on the title page. (4) Do retention test on igniter end of cable only: (a) Connect contact with tool (Ref. Fig. 3014981. 3032096.3000 N/A **3035102 Champion: CH34055 0. Spark Igniter Erosion Limits P&WC PART NO.0613 to 0.3437 0.125 lb. reject the spark igniter.0312 * 3024706 A. A (IN) DIM. 74-20-00 IGNITION CABLES AND SPARK IGNITERS .C. ship cable to an authorized repair shop for inner cable replacement. TABLE 202.125 lb. Ignition Cables (1) Inspect cables for signs of damage to braiding and general condition. Spark Igniters (1) Inspect the exterior cylindrical area of the firing end of the igniter shell for chafing wear. ** Later parts supplied under ordering Part No. Pin Diameter Pin Surface Finish Weight 0. TABLE 201. 205 and Table 202). B (IN) * 3014986 Champion: FHE-182 0.MAINTENANCE PRACTICES Page 216 Nov 21/2008 . (c) If contact does not hold weight. (3) Inspect central conductor and insulation for contamination and burning.3000 N/A * Earlier parts supplied under ordering Part No.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. weight. VENDOR NAME AND PART NO. Igniters eroded beyond limits should be replaced by latest part(s). P&WC Proprietary Information. Inspection/Check A.1000 ** 3027280 Champion: CH34055 0.0617 inch 8 to 16 µinch 0. if available. (2) Inspect cable coupling nuts for corrosion. 3043512 7. If erosion equals or exceeds amounts shown. (2) Inspect the igniter shell and electrode for erosion (Ref. Adjustment/Test).2750 0. DIM. POSSIBLY NOT DETECTABLE BY TEST. Subject to the restrictions on the title page.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. INTERNAL DAMAGE. A DIM.MAINTENANCE PRACTICES Page 217 Nov 21/2008 . RECOMMENDATION IS TO REPLACE THE IGNITER PLUG. C174 Spark Igniter Erosion Limits Figure 205 P&WC Proprietary Information. B NEW IGNITER ACCEPTABLE WEAR WORN OUT NOTE: FOR DIMENSIONS A AND B REFER TO TABLE 201. 3043512 CAUTION: SHOULD AN IGNITER PLUG BE DROPPED. CAN OCCUR. 74-20-00 IGNITION CABLES AND SPARK IGNITERS . as required. Approved Repairs A. Starting at opposite end. Make sure damage.375 inch long. 3043512 8. to remove all contaminants from ignition cable.500 inch from nearest connector. 74-20-00 IGNITION CABLES AND SPARK IGNITERS . (4) Clean braiding with solvent (PWC11-014) or (PWC11-032). flange or existing repair. Cable Braiding Major Damage (Ref. WEAR PROTECTIVE (RUBBER) GLOVES AND WASH HANDS AFTER EXPOSURE TO CLEANER. (3) Use a solder (PWC05-058) with suitable flux to solder damaged area. (2) Clean damaged area of braiding with clean cloth dampened with solvent (PWC11-014) or (PWC11-032). then dry repaired area with filtered. AdjustmentTest). APPLY ONLY ENOUGH HEAT TO FLOW SOLDER.MAINTENANCE PRACTICES Page 218 Nov 21/2008 . (4) Wrap repaired area with stainless steel wire as shown. Repeat Step (4). Replace ignition cable assembly if damage exceeds these limits. CAUTION: SOLDERING IRON MUST NOT EXCEED 250 WATTS. A. Overlap damaged area by approximately 0. WARNING: CLEAN CABLE ASSEMBLY IN A WELL-VENTILATED AREA. (6) Check cable assembly for continuity and insulation resistance prior to installation (Ref. (5) Smooth repaired area with abrasive cloth to blend with braided surface. (3) Wrap tape (PWC05-066A) around cable braiding. 206) (1) Examine damaged area. covering all of damaged area as shown.500 inch from nearest connector or flange and there is no damage to underlying insulation. edge of damage is at least 0. Fig. WARNING: WEAR PROTECTIVE EQUIPMENT FOR EYES AND FACE WHEN USING COMPRESSED AIR.). wrap wire tightly and uniformly over cable braiding and repaired area.125 inch. Make sure damage does not exceed 0. Subject to the restrictions on the title page. B. (Ref. P&WC Proprietary Information.00 inch long and is at least 0. NOTE: Make sure wire overlaps tape and contacts cable braiding at each end of repair. Cable Braiding Minor Damage (1) Examine damaged area. AIR PRESSURE MUST NOT EXCEED 30 PSI MAXIMUM. Subpara. Hold wrapping wire supply along length of cable braid beginning from the left. does not exceed 1. AVOID PROLONGED INHALATION OF FUMES. compressed air not exceeding 30 psi. (2) Remove loose strands of braiding around damaged area.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. MAINTENANCE PRACTICES Page 219 Nov 21/2008 . 74-20-00 IGNITION CABLES AND SPARK IGNITERS . 3043512 INSULATING TAPE B X 1/3 X C A C4960C Repair of Ignition Cable .PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. Subject to the restrictions on the title page.Major Damage Figure 206 P&WC Proprietary Information. allow short end of loop to remain exposed. (5) When approximately two-thirds of wrapping is completed. or other low voltage continuity device. Subject to the restrictions on the title page. (6) After final turn of wrapping. 74-20-00 IGNITION CABLES AND SPARK IGNITERS .MAINTENANCE PRACTICES Page 220 Nov 21/2008 . 3043512 9. insert wire ‘‘A’’ through loop as shown. NOTE: Return defective cables to authorized repair shop for inner cable replacement. Resistance from terminal to terminal must be 0. Cut wire and ’’C‘‘ flush. Adjustment/Test A.5 Ω max. (2) Insulation resistance between metal braiding and inner cable must be 100 KΩ min. Continue wrapping wire to complete remaining distance. (7) Test cable assembly for continuity and insulation resistance prior to usage (Ref. AdjustmentTest). Cut off surplus end ‘‘B’’ of wire so that length is approximately one-third of repair length.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. shown as ‘‘1/3X’’. Pull loop and ‘‘C’’ until wire at ‘‘A: is snug and end ’’B‘‘ of wire has just disappeared underneath final turn of wrapping. Ignition Cables (1) Check for continuity using an ohmmeter Model 260. P&WC Proprietary Information. 3043512 SPARK IGNITERS .DESCRIPTION AND OPERATION Page 1/2 Nov 26/2004 . Description and Operation Information moved to chapter 74-20-00.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO.DESCRIPTION AND OPERATION 1. DESCRIPTION AND OPERATION. 74-20-04 SPARK IGNITERS . . 6. 7. Removal/Installation Information moved to chapter Chapter 74-20-00. General A. Fixtures. Inspection/Check Information moved to chapter Chapter 74-20-00. Special Tools Not Applicable 4. Consumable Materials NOTE: 3.MAINTENANCE PRACTICES Page 201/202 Nov 26/2004 . MAINTENANCE PRACTICES. Information moved to Chapter 74-20-00.MAINTENANCE PRACTICES 1. MAINTENANCE PRACTICES. 3043512 SPARK IGNITERS . Information moved to Chapter 74-20-00. MAINTENANCE PRACTICES. MAINTENANCE PRACTICES. Cleaning/Painting Information moved to chapter Chapter 74-20-00.PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO. MAINTENANCE PRACTICES. 2. Equipment and Supplier Tools Not Applicable 5. 74-20-04 SPARK IGNITERS .