HIGH TENSION LEADS - ADJUSTMENT/TEST
1. General
A. High tension leads adjustment/test consists of a cable and an insulation check.
(1)
When checking high tension leads cable for continuity, there must be continuity from terminal to terminal.
(2)
When checking high tension lead insulation, there must be no visual indication of insulation breakdown.
2. Equipment and Materials
A. Multimeter (Ohmmeter) - Part No. AN/PSM6 (continuously)
3. Check High Tension Lead Cable
A. Disconnect high tension lead cable terminal ends.
B. Check the high tension lead cable for continuity using an ohmmeter or other low voltage device. There must be continuity from terminal to terminal.
C. Replace or connect (as applicable) high tension lead (Ref Removal/Installation).
4. Check High Tension Lead Insulation
A. Disconnect high tension lead cable terminal ends.
B. Use an ohmmeter or other low voltage device between contact and conduit. No continuity shall be indicated.
NOTE: Ohmmeter (low voltage continuity check) test will only identify major defects. If insulation breakdown under high voltage is suspected, return high tension leads to overhaul for further testing.
C. Replace or connect (as applicable) high tension lead (Ref Removal/Installation).
500
Feb 15/79 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 74-21-11 Page 501
IGNITER PLUGS - REMOVAL/INSTALLATION
1. General
A. Two igniter plugs for each engine are mounted on the lower front of the combustion chamber outer case. One projects into the number four combustion chamber and the other projects into the number seven combustion chamber.
2. Equipment and Materials
A. Igniter Plug Boss Tap - PWA 33647 (supersedes PWA 8597), Pratt and Whitney Aircraft, East Hartford, Connecticut.
B. Combustion Chamber Igniter Plug Guide Aligning Tool - (local fabrication)
C. Compound - Antiseize, EASE-OFF 990 or FEL-PRO C5-A
D. Cleaning Solvent - BMS 3-2
E. Lubricant - Molykote Type Z
F. Compound - Antiseize, BG Mica Lube A-768
G. Compound - Antiseize, Parker Treadlube, Fleet Supplies, Inc., Cleveland, Ohio
H. Compound - Antiseize (PWA 36001), Silver Goop, Crawford Fitting Co., Solon, Ohio
3. Remove Igniter Plugs (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.
A. Disconnect coupling nuts that secure cables to left and right igniter plugs and install protective covers on coupling nuts.
WARNING: FOR ADDITIONAL PROTECTION AGAINST ELECTRICAL HAZARD, AFTER DETACHING THE IGNITER PLUG COUPLING NUTS TOUCH THE CONNECTOR CONTACT TO THE IGNITER PLUG BODY SHIELD.
B. Remove nuts, washers, bolts and spacer sleeves that secure packing holders to left and right igniter bosses on fan duct, and remove packing holders.
CAUTION: IT WILL BE NECESSARY TO REPLACE THE IGNITER PLUG IF IT IS DROPPED.
500
Feb 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 74-21-21 Page 401
Igniter Plug Removal/Installation 500
74-21-21 Figure 401 (Sheet 1) Oct 20/84
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