Piper SEMINOLE PA-44-180, Maintenance Manual

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CHART 2103. INSPECTION (IGNITION UNIT)
INSPECTION OF IGNITION UNIT.
Inspect components as directed in Chart 2103 and Figure 21-13.
— Note —
Replace any component that fails to meet checks listed in Chart 2102.
CYCLING SWITCH AND LIMIT (OVERHEAT) SWITCH. (Refer to Figure 21-18)
1. Removal:
A. If the limit switch is damaged or defective, disconnect the three electrical leads from the switch
terminals. Be sure to mark the leads for proper reassembly. (The switch terminals are identified by
numbers “1”,“2” and “3”).
B. Remove the two attaching screws and lift the limit switch and spacers (gaskets) from the
jacket opening.
C. If the cycling switch is damaged or defective, disconnect the electrical leads being sure
to mark them for proper reassembly.
D. Remove the two screws and lift the cycling switch from the jacket opening.
— Note —
No attempt should be made to repair either of these switches. If they do not operate
properly, they should be replaced.
2. Installation: (Refer to Figure 21-18)
A. Install the limit switch and spacers (gaskets) by placing them in position in the heater jacket
opening and installing two screws.
B. Tighten screws securely; then reconnect the electrical leads in accordance with markings made
during disassembly. (Refer to wiring diagram, Figure 21-7)
C. Install the cycling switch (refer to Figure 21-18) by placing it in position in the heater jacket
opening and securing it with the two screws. Tighten screws securely; then reconnect the electrical
leads to their respective terminals as marked during disassembly. (Refer to wiring diagram, Figure
21-7)
Index No. Nomenclature Inspection
1 Cover Assembly Inspect for security of lead assembly to cover.
Ignition cable, grommet, terminal and connector
for carbon tracks, cracks or distortion. Repair
or replace for any of the above conditions.
4 Ignition Coil Inspect for broken bakelite, carbon tracks, oil
leaks, and dents in coil cover. Replace for any
of the above conditions.
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
2 1 - 4 3 - 2 0
Page 21-27
Revised: May 15, 1989
1F18
PIPER AIRCRAFT