Description and Operation
2-3.
Maintenance and Overhaul Periods
NOTE: Refer to Figure 1 for an exploded view of the Magneto.
Figure 2-3. Cam End of Dual Contact Assembly Magneto
Magneto grounding circuit function and Magneto-to-engine timing must be inspected at
each 100 hour, annual, or progressive inspection. Perform the grounding check according
to instructions in Section 6-2.1 at each of these intervals, and perform the contact
inspection according to the instructions in Section 6-2.2 any time magneto-to-engine
timing is found to be outside engine manufacturer's limits.
Inspect magnetos equipped with snap-ring impulse couplings (8) at the first 500 hours in
service and every 500 hours thereafter according to instructions in Section 6-2.4. Inspect
magnetos equipped with riveted impulse couplings (8) at the first 100 hours in service and
every 100 hours thereafter according to instructions in Section 6-2.3.
Inspect all magnetos according to instructions in Section 6-2.4 at the first 500 hours in
service and every 500 hours thereafter. If the magneto has more than 500 hours,
inspection, as outlined above must take place within the next 100 hours, or at the next
scheduled inspection period, whichever occurs first, and at 500-hour intervals thereafter.
Upon completion of inspection, make an appropriate logbook entry signifying inspection
compliance, referencing the serial numbers of the inspected magnetos.
S-20/S-200 Series High Tension Magneto Service Support Manual
29 October 2018
2-3
Description and Operation
The magneto is an integral part of the engine and undergoes the same deterioration as the
engine. Severe environmental conditions, engine over-speeds, sudden stoppage,
immersion and other unusual circumstances may require complete or partial engine
overhaul prior to the overhaul time recommended by the engine manufacturer. Under
these circumstances, the magneto (regardless of “In Service” time) must be overhauled
with particular attention focused on all rotating parts, bearings, and electrical components.
Magnetos with serial number older than Dl5FA000(R)1 or, El5FA000(R)1 (June 1, 2015)
must be overhauled or replaced at the expiration of five years since the date of original
manufacture or last overhaul, or four years since the magneto was placed in service,
whichever occurs first, without regard to operating hours.
In addition to the requirements listed in the two paragraphs above, S-20 and S-200 series
magnetos with a serial number newer than Dl5FA000(R)1 or El5FA000(R)1 (June 1, 2015)
must be overhauled or replaced at the expiration of thirteen years since the date of original
manufacture or last overhaul, or twelve years since the magneto was placed in service,
whichever occurs first, without regard to operating hours.
1. See latest revision of Section 2-5, “Serial Number Interpretation” for information regarding CMI serial numbers.
2-4
S-20/S-200 Series High Tension Magneto Service Support Manual
29 October 2018
Description and Operation
2-6.
Rebuilt Magnetos
Since May 1999, Continental Factory Rebuilt Magnetos have been marked with part
numbers beginning with BL-(“Blue Label”) instead of the 10- prefix. For example, the
part number of a factory rebuilt magneto typically reads BL-500514-1. Rebuilt data plates
are blue in color and include the word “REBUILT.”
Magnetos marked with a BL prefix part number are FAA-PMA eligible for installation on
the same engines for which the corresponding articles marked with a 10- part number are
approved. Magnetos marked with a BL prefix are fully interchangeable with
corresponding units marked with a 10- prefix. Likewise, to maintain BL- prefix magnetos,
use the corresponding 10- prefix parts list data.
2-7.
Storage and Transit
During periods of storage and/or transit, ensure that magnetos are adequately protected
from hazards including but not limited to shock, mechanical damage, contamination,
corrosive environment, extreme temperatures, and ultraviolet radiation.
Following periods of storage and/or transit, it is the installer’s responsibility to ensure
magneto is undamaged and suitable for installation.
Maximum magneto storage intervals are included in the maximum overhaul intervals
described in Section 2-3.
2-8
S-20/S-200 Series High Tension Magneto Service Support Manual
29 October 2018