(3)
Disconnect coupling nuts on airframe cables from input connectors on front of exciter and install protective covers on nuts and on connectors.
(4)
Cut lockwire and remove four bolts and washers securing ignition exciters to front and rear supports.
(5)
Spread front and rear supports and remove ignition exciters, input (front) end first.
(6)
Remove bolts and locknuts securing exciters together.
B. Install Ignition Exciter (Fig. 402)
(1)
Position exciters on bench with larger threaded (output) connectors at operator's right. Align four small holes in tabs at ends of both boxes and secure together with bolts and locknuts, boltheads against upper exciter (away from operator). Tighten bolts to recommended torque.
(2)
Spread front and rear ignition exciter supports and insert ignition exciters between supports, output (rear) end first.
CAUTION: USE OF BOLTS LONGER THAN THOSE SPECIFIED FOR IGNITION EXCITER MOUNTING WILL RESULT IN DAMAGE TO IGNITION EXCITER HOUSING, WITH SUBSEQUENT LOSS OF HERMETIC SEALING AND RISK OF ELECTRICAL GROUNDING.
(3)
Secure ignition exciters to supports with four bolts and washers. Tighten bolts and lockwire.
(4)
Bolt exciter to brackets using washers under boltheads and secure with self-locking nuts. Tighten bolts to recommended torque.
WARNING: IGNITION CABLE RUBBER BUSHINGS AND ADJACENT PARTS MAY CONTAIN RESIDUE OF KRYTOX 240 AC GREASE. DO NOT CONTAMINATE SMOKING MATERIALS (CIGARETTES, CIGARS, ETC.) WITH KRYTOX 240 AC GREASE. COMBUSTION PRODUCTS OF KRYTOX 240 AC GREASE COULD BE HARMFUL IF INHALED. AVOID SKIN CONTACT. WASH HANDS IMMEDIATELY AFTER CONTACT WITH KRYTOX 240 AC GREASE. THIS GREASE IS NO LONGER USED ON THE IGNITION CABLES.
CAUTION: ENSURE THAT OUTPUT (HIGH TENSION) LEADS ARE CORRECTLY INSTALLED. INSUFFICIENT TORQUE ON LEAD NUTS AT EXCITER AND IGNITER ENDS CAN CAUSE IGNITION RADIATED NOISE WHICH CAN BE PICKED UP BY AIRCRAFT RADIO EQUIPMENT.
(5)
Remove the caps and connect the coupling nuts for the output cables to the connectors on the rear of the exciter. Tighten the nuts with your fingers, then tighten them a maximum of 45 degrees more.
(6)
Remove protective caps and secure exciter coupling nuts on air frame input cables to threaded connectors on front of exciter. Tighten to recommended torque and lockwire.
(7)
Perform ignition system (audible) check (AMM 74-00/501)
569
Feb 01/96 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 74-11-11 Page 403
G42760
Ignition Exciter (Dual Rack) Installation 569
74-11-11 Figure 402 Oct 20/91
Page 404
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
HIGH TENSION LEADS - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Lubricant, Molykote Type Z per MIL-M-7866
B. Solvent -Acetone
C. Bushing - Rubber, PN 10-319434, Bendix Corp., Sidney, NY 13815 or Unison Industries, 7575 Baymeadows Way, P.O. Box 17880, Jacksonville, FL 32245
D. Bushing - Rubber, PN 23711, Simmonds Precision, Engine Systems Division, Norwich, NY 13815
E. Ring - Retaining, PN 5100-25-H, Simmonds Precision, Engine Systems Division, Norwich, NY 13815
2. Remove High Tension Leads (Fig. 401 and 402)
WARNING: IGNITION SYSTEM VOLTAGE IS DANGEROUSLY HIGH. IGNITION SWITCH MUST BE IN "OFF" POSITION BEFORE REMOVAL OF ANY IGNITION COMPONENTS. ALLOW SEVERAL MINUTES TO ELAPSE BETWEEN OPERATION OF IGNITION SYSTEM AND REMOVAL OF IGNITION COMPONENTS. IMMEDIATELY UPON DETACHING IGNITER CABLE FROM IGNITER PLUG, DISCHARGE CURRENT BY GROUNDING IGNITER CABLE TERMINAL TO ENSURE COMPLETE DISSIPATION OF ENERGY FROM IGNITION SYSTEM. FAILURE TO FOLLOW THIS PROCEDURE COULD RESULT IN SEVERE INJURY TO PERSONNEL.
A. Disconnect coupling nuts that secure ignition cables to output connectors on rear of exciter.
WARNING: IGNITION CABLE RUBBER BUSHINGS (CHAMFER WASHERS) AND ADJACENT PARTS MAY CONTAIN RESIDUE OF KRYTOX 240 AC GREASE. DO NOT CONTAMINATE SMOKING MATERIALS (CIGARETTES, CIGARS, ETC.) WITH KRYTOX 240 AC GREASE. COMBUSTION PRODUCTS OF KRYTOX 240 AC GREASE COULD BE HARMFUL IF INHALED. AVOID SKIN CONTACT. WASH HANDS IMMEDIATELY AFTER CONTACT WITH KRYTOX 240 AC GREASE. THIS GREASE IS NO LONGER USED ON THE IGNITION CABLES.
B. Disconnect coupling nuts that secure ignition cables to the left and right igniter plugs.
C. Install protective caps on coupling nuts on both ends of cables, on mating threaded output connectors on exciter, and igniter plug openings in fan discharge duct caused by removal of the cables.
D. Remove nuts and bolts securing single clip on left cable, and four clips on right, to brackets on flange J1 and remove cables and coupling nut assemblies.
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