IGNITION EXCITER - REMOVAL/INSTALLATION
P&WA 74-11-1, Page 401 and 402, May 01/91
1. General
A. This procedure contains the steps for the removal and the installation of the single pack exciters (20-4 joule)(par. 2) and the dual pack exciters (20 joule or 20-4 joule)(par. 3).
2. Single Pack (20-4 Joule) Exciter
A. Remove Ignition Exciter (Fig. 401)
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.
(1)
Disconnect coupling nuts that secure ignition cables to output connectors on rear of exciter.
(2)
Install protective caps on coupling nuts of cables and on mating threaded output connectors on exciter.
(3)
Disconnect coupling nut which secures (input) airframe cable to input connector on front of exciter and install protective covers on nut and connector.
(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 exciter, input (front) end first.
B. Install Ignition Exciter (Fig. 401)
(1)
Spread front and rear ignition exciter supports and insert ignition exciter 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.
(2)
Secure ignition exciter to supports with four bolts and washers. Tighten bolts and lockwire.
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 AIRPLANE RADIO EQUIPMENT.
(3)
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.
(4)
Remove protective cap and secure exciter coupling nut on air frame input cable to threaded connector on front of exciter. Tighten to recommended torque and lockwire.
(5)
Perform ignition system (audible) check (AMM 74-00/501).
569
Oct 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 74-11-11 Page 401
3. Dual Pack (20 or 20-4 Joule) Exciter
A. Remove ignition Exciter (Fig. 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.
E65920
Ignition Exciter (Single Pack) Installation 569
74-11-11 Figure 401 Feb 01/95
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
P&WA 74-21-1, Page 401, Nov 01/94
(1)
Disconnect coupling nuts that secure ignition cables to output connectors on rear of exciter.
(2)
Install protective caps on coupling nuts of cables and on mating threaded output
connectors on exciter.
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