TELEDYNE CONTINENTAL IGNITION SYSTEMS ... - tcmlink.com

1 ISSUEDREVISEDPAGE NO REVISIONMODAYYEARMODAYYEAR1 of 10101894 TELEDYNE CONTINENTAL Box 90 MOBILE ALABAMA 36601(205) 438-3411 TELEDYNE CONTINENTAL IGNITION SYSTEMSSERVICE INFORMATION LETTERC ontains Useful Information Pertaining To Your AircraftIgnition SystemSUBJECT:OPTIONAL CONVERSION TO "SHOWER-OF-SPARKS" IGNITIONREASON FOR To provide installation data regarding "Shower-Of Sparks" IGNITION :EQUIPMENTAFFECTED:MAGNETOMAGNETOMAGNETO MAGNETOTYPENUMBERPARTNUMBERTYPENUMBERPAR TNUMBERS4LN-2110-51360-26S6RN-2510-79020 -19S4LN-2110-51360-37S6 RSC-2510-500556-1S4LN-2110-51360-45S6 LSC-2510-500556-3S4LN-2110-51360-54S4LN- 122710-349365-3S4LN-2110-51360-55S4LN-12 2710-349365-9S4LN-2110-51360-58S6RN-1225 10-349350-4S4 LSC-2110-500514-1S6RN-122510-349350-5S4 LSC-2110-500514-2S6LN-122510-349350-6S6L N-2110-51365-39S6LN-122510-349350-7S6LN- 2110-51365-47S6LN-122710-349370-4S6LN-21 10-51360-57D6LN-203110-385126-105S6 LSC-2110-500516-2D6LN-203110-385126-107S 6

2 LSC-2110-500516-4D6LN-300010-685126-105S 6LN-2510-79020-6D6LN-300010-685126-107S6 RN-2510-79020-10D6LN-300010-685126-108S6 LN-2510-79020-16D6LN-300010-785126-105S6 LN-2510-79020-18D6LN-300010-785126-107 COMPLIANCE:At user s INFORMATION:Since the 1940's, the vast majority of four and six cylinder aircraft engines have been manufactured toinclude one of two SYSTEMS to assist magneto IGNITION during engine start: either the impulse coupling orthe "Shower-of-Sparks" booster impulse coupling is a mechanical device attached to the drive shaft of the magneto. Impulsecouplings contain moving parts which are subject to wear.

3 In order to avoid periodic inspections forimpulse coupling wear, operators may convert their IGNITION equipment from impulse coupling 5 SIL648 FAA APPROVEDISSUEDREVISEDPAGE NO REVISIONMODAYYEARMODAYYEAR2 of 10101894 TELEDYNE CONTINENTAL Box 90 MOBILE ALABAMA 36601(205) 438-3411A typical Shower-of-Sparks IGNITION system includes a special IGNITION switching arrangement, a"boosted" left mounted magneto fitted with a retard breaker, a "non-boosted" right mounted magnetowhich is grounded during starting, and a starting function of the special IGNITION switching arrangement is to ground the right mounted magnetoduring the start cycle, to energize the starter relay and the starting vibrator.

4 And to direct the startingvibrator output voltage to both the main and retard breakers in the left mounted magneto for engine applications can be converted from impulse coupled to Shower-of-Sparks starting. SeeTable 1for a complete listing of eligible engines. All engines listed in Table 1 may be converted byremoving the impulse coupled magneto(s) and replacing them with Shower-of Sparks magnetos asdetailed in Table 1. Follow Detailed Instructions, paragraph A for complete installation instructions. In afew cases, impulse coupled magnetos themselves may be converted to Shower-of-Sparksconfigurations.

5 See Detailed Instructions, paragraph B, for conversion instructions, then installreconfigured magnetos in accordance with paragraph INSTRUCTIONSA. "Shower-of-Sparks" Conversion1. Remove impulse coupled magneto(s). If possible, magneto(s) may be converted to Shower-of-Sparks configuration in accordance with paragraph B. Install Shower-of-Sparks replacementmagneto(s) and associated mounting and drive parts in accordance with applicable engineparts list (see NOTE, below). Adjust magneto-to-engine timing in accordance with enginemanufacturer's instructions. See Table 1 for application many Lycoming installations, some additional engine parts, such as gears,standoffs, drive plates, studs and clamps may be necessary for conversion.

6 Consult engineparts list. Also for many Lycoming installations, only the left magneto was originally equippedwith an impulse coupling. Therefore, these engines can be converted to Shower-of-Sparkswithout affecting the right magneto in any Using suitable mounting hardware and acceptable standard shop practice, install startingvibrator unit on airframe. Refer to Table 4 for a list of typical installation materials. Vibrator unitis to be mounted in a location which will provide minimum wire lengths, freedom from excessiveheat or exposure to the elements, freedom from interference with other parts of the aircraft, andaccessibility for inspection.

7 Vibrator unit part number selection is based on electrical systemvoltage and magneto type. See Table 2 for vibrator applications. Complete the Shower-of-Sparks wiring using standard 18 gage (or larger) aircraft wire as necessary. See Figure 1 orFigure 2 for typical wiring aircraft grade materials must be used. Selection of materials, installationpositioning, routing of wires, and installation workmanship must be performedin accordance with all applicable Federal Aviation Regulations, including but notlimited to: Section , , , , , and NO REVISIONMODAYYEARMODAYYEAR3 of 10101894 TELEDYNE CONTINENTAL Box 90 MOBILE ALABAMA 36601(205) 438-34113.

8 Complete an FAA Form 337 with all pertinent information regarding conversion, referencing thisService Information Letter and detailing specific parts added and deleted as well as specificnew wiring Magneto ConversionCertain impulse coupled magnetos may be economically converted to magneto specifications withretard breaker (boosted) or with no start assist mechanism (non-boosted). Such magnetos arelisted in Table 3. Following the latest revision of the appropriate service manual and parts catalog(included in TCM IGNITION SYSTEMS Master Service Manual, Form X40000):1. Remove impulse coupling and replace with P/N 10-163003 drive plate and associatedattaching Stop pins in S-20 Series magnetos being converted may be left in place.

9 Stop pins in S-1200 Series magnetos being converted MUST be left in place, unless flange is replaced with P/N 10-349392-1 flange with sealed stop pin holes. If converting to non-boosted magneto, proceed tostep When converting to boosted (with retard breaker) magnetos, mark and adjust distributor gearas specified for boosted magnetos, then install and adjust retard breaker. Install retard lead andassociated For S6LN-25 and S6RN-25 magnetos, remove and discard cap nut P/N 10-163177 anddisk P/N 10-163384 from retard For all other magnetos, remove magneto cover from magneto housing and drill hole.

10 290inch diameter through cover at retard countersink position. Remove all debris and burrsfrom cover prior to assembly of retard stud terminal and associated Assemble new data plate onto magneto to indicate new magneto part number and typenumber. Data plate P/N 10-400012 is to be used for S-200 Series magnetos. Data plate P/N10-400009 is to be used for S-1200 Series REQUIRED:As determined by HOURS REQUIRED:Approximately 2 hours per CHANGE:As determined by CONSIDERATION:None. Compliance with this Service Information Letter is optional. New or Rebuilt parts installed inaccordance with this Service Information Letter are covered under the terms and conditions of thestandard TCM IGNITION SYSTEMS Warranty NO REVISIONMODAYYEARMODAYYEAR4 of 10101894 TELEDYNE CONTINENTAL Box 90 MOBILE ALABAMA 36601(205) 438-3411 TABLE 1 SHOWER-OF-SPARKS CONVERSION INFORMATIONMAGNETO TO ENGINE APPLICATION CHARTISSUEDREVISEDPAGE NO REVISIONMODAYYEARMODAYYEAR5 of 10101894 TELEDYNE CONTINENTAL Box 90 MOBILE ALABAMA 36601(205)