3. Install High Tension Leads (Fig. 401 thru 404)
CAUTION: CERAMIC INSULATOR MUST BE DRY. ENSURE THAT HIGH TENSION LEADS ARE CORRECTLY INSTALLED. INSUFFICIENT TORQUE ON LEAD NUTS AT IGNITION EXCITER AND IGNITER ENDS CAN CAUSE IGNITION RADIATED NOISE WHICH CAN BE PICKED UP BY AIRPLANE RADIO EQUIPMENT.
A. Remove protective caps from coupling nuts on left and right high tension leads.
B. Replace Bendix high tension lead rubber bushings (chamfer washers) as follows (Fig. 403):
NOTE: Bushing (chamfer washer) replacement procedure is not applicable for new cable assemblies. Perform inspection of cable during bushing (chamfer washer) replacement.
(1) Remove and discard rubber bushing (chamfer washer) at both ends of cable.
WARNING: 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 APPLICATION OF KRYTOX 240 AC GREASE.
Bendix High Tension Lead Installation 569
74-21-11 Figure 401 Feb 01/96
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(2) Clean new rubber bushing (chamfer washer) with clean lint-free cloth moistened with solvent.
569 Simmonds Precision (GLA) High Tension Lead Installation
Feb 01/96 Figure 402 74-21-11
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
L12023
P&WA, 74-21-1, Page 402, Jan 01/90 P&WA, 74-21-1, Page 407/408, Jan 01/90
C. Insert new packing in groove in OD of igniter plug coupling nuts on left and right high tension leads.
D. Clean threads on ID of nuts with petroleum solvent and apply Molykote Type Z.
E. Carefully insert leads, install ends of leads into the terminal well of igniter plugs, thread coupling nuts on plugs, and tighten to recommended torque.
F. Remove protective caps, replace chamfered washer in accordance with par. 3.B. and secure exciter coupling nuts on left and right ignition output cables to two threaded connectors on rear of exciter(s). Tighten to recommended torque.
G. Secure single clip on left output cable, and four clips on right output cable, to brackets on Flange J1, with bolts and nuts. Tighten to recommended torque.
H. Perform ignition system (audible) check (Ref 74-00 A/T).
Bendix High Tension Lead Rubber Bushing 569
74-21-11 (Chamfer Washer) Replacement Oct 20/90
Page 404 Figure 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
P&WA 74-21-1, Page 405, Nov 1/94
C. Replace Simmonds Precision (GLA) rubber bushing as follows (Fig. 403):
NOTE: Bushing replacement procedure is not applicable for new cable assemblies. Perform inspection of cable during bushing replacement.
(1)
Remove and discard retaining ring from high tension contact.
WARNING: 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 APPLICATION OF KRYTOX 240 AC GREASE.
(2)
Slide high tension insulator and rubber bushing from cable wire. Discard rubber bushing.
(3)
Clean new rubber bushing with clean lint-free cloth moistened with solvent.
(4)
Apply a light coat of Krytox 240 AC grease to rubber bushing sealing face. Sealing face is identified as shoulder of rubber bushing facing high tension insulator.
(5)
Slide rubber bushing and existing high tension insulator on cable wire and secure in place with new retaining ring on high tension contact.
CAUTION: DO NOT TWIST PLUG OF CABLE WHEN TURNING COUPLING NUT. DAMAGE TO CABLE COULD RESULT.
NOTE: No grease is allowed externally on insulator or other details of lead.
NOTE: Torque all plug-in type threaded connections finger-tight plus 45 degree maximum turn.
569 Simmonds Precision (GLA) High Tension Lead
Feb 01/96 Rubber Bushing Replacement 74-21-11
Figure 404 Page 405
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. Insert new packing in groove in OD of igniter plug coupling nuts on left and right high tension leads.
E. Clean threads on ID of coupling nuts with petroleum solvent and apply Molykite, Type Z.
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