Ignition Harness Inspection; Harness Maintenance - Piper PA-44-180 SEMINOLE Maintenance Manual

8. Insert a spare rotating magnet, with woodruff key in taper, into cam assembly. Turn magnet slightly in
direction of coupling rotation (to wind spring). Lift magnet with cam only enough to clear projections on
the body. Wind spring one-half turn and re-engage the cam assembly into the body.
9. Tension of the spring assembly in the assembled coupling when wound to point of impulse tripping must not
be less than 9 or more than 15 inch-pounds.
DISTRIBUTION.
IGNITION HARNESS.
INSPECTION OF HARNESS.
1. Inspect cover for cracks or other damage. Inspect lead assemblies for abrasions, mutilated braid or other
physical damage.
2. Inspect grommets for tears and eyelets for spark erosion.
3. Disconnect harness coupling nuts from the spark plugs and extract the lead terminations. Inspect contact
springs and compression springs for any damage or distortion. Inspect sleeves for cracks or carbon
tracking.
4. Inspect coupling nuts and elbow assemblies for damaged threads or other defects.
Replace any damaged components per instructions given in paragraph titled
Maintenance of Harness.
5. Test continuity of each harness lead using a High Tension Lead Tester, Part No. 11-8888 or 11-8888-1 from
Bendix as follows:
A. Connect black test lead to contact spring and red lead to eyelet of the same lead. (Refer to Figure 74-
20.)
B. Observe that the continuity lamp illuminates.
6. Test insulation resistance of each harness lead by using the 11-8888 or 11-8888-1 tester as follows:
A. Attach the red high voltage test lead to contact spring of harness lead. (Refer to Figure 74-21.)
B. Attach the black test lead to the ferrule of the same harness lead. (Refer to Figure 74-21.)
C. Depress PRESS-TO-TEST pushbutton switch.
D. Observe that indicator lamp flashes and GAP fires simultaneously as long as the PRESS-TO-TEST
switch is held depressed. Whenever indicator lamp flashes and GAP fails to fire, lead under test is
defective and must be replaced.
MAINTENANCE OF HARNESS.
Minor repairs of the harness assembly, such as replacement of contact springs, sleeves, compression springs,
eyelets, or grommets can be accomplished with the harness mounted on the engine. Lead assemblies may also be
replaced with harness mounted on the engine unless inaccessibility of installation or number of leads to be
replaced makes it unreasonable.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— Note —
3G12
7 4 - 2 1 - 0 3
Page 74-19
Revised: May 15, 1989