Airworthiness Directive · Amendment 39-14122 · Teledyne Continental Motors (Formerly Bendix) S-20, S-1200, D-2000, and D-3000 Series Magnetos
Teledyne Continental Motors (Formerly Bendix) S-20, S-1200, D-2000, and D-3000 Series Magnetos
(c) This AD applies to Teledyne Continental Motors (TCM) (formerly Bendix) magnetos that have a magneto part number (P/N) listed in Table 1 of TCM Mandatory Service Bulletin (MSB) No. MSB645, dated April 4, 1994, installed on Lycoming AEIO-540, HIO-540, IO-540, 0-540, and TIO-540 series engines. These engines are installed on, but not limited to, airplanes manufactured by the Cessna Aircraft Company, Maule Aerospace Technology Corporation, Mooney Aircraft Corporation, The New Piper Aircraft Inc., and Raytheon Aircraft Company (Formerly Beech Aircraft Company).
(d) This AD results from data provided by the manufacturer that indicates a need to reduce the inspection intervals for riveted-impulse coupling assemblies used on certain Lycoming engine models. We are issuing this AD to prevent failure of the magneto impulse coupling assembly and possible engine failure.
The FAA is superseding an existing airworthiness directive (AD) for Teledyne Continental Motors (TCM) (formerly Bendix) S-20, S- 1200, D-2000, and D-3000 series magnetos equipped with impulse coupling assemblies. That AD currently requires replacing riveted-impulse coupling assemblies and snap-ring coupling assemblies, which are worn beyond limits, with serviceable riveted-impulse coupling assemblies or snap-ring impulse coupling assemblies. This ad requires a reduced inspection interval for magnetos with riveted-impulse coupling assemblies installed on certain Lycoming engine models. This AD does not lower the inspection interval for magnetos with snap-ring impulse coupling assemblies. This AD also limits the applicability to certain Lycoming engine models. This AD results from data provided by the manufacturer that shows a need to reduce the inspection intervals for riveted-impulse coupling assemblies used on certain Lycoming engine models. We are issuing this AD to prevent failure of the magneto impulse coupling assembly and possible engine failure.
(f) For all magnetos that have a P/N listed in Table 1 of TCM MSB No. MSB645, dated April 4, 1994, that have never been inspected, perform an initial inspection of the impulse coupling assembly for wear using paragraphs 1.2 through 1.4.5 of the Detailed Instructions of TCM MSB No. MSB645, dated April 4, 1994. Use the following Table 1 for the compliance times. Snap-ring impulse coupling assemblies will have an “A” stamped in the lower-right quarter of the magneto data plate.
| Engine Model | Type of impulse coupling assembly | Time on impulse coupling assembly on the effective date of this AD | Inspect |
|---|---|---|---|
| Lycoming AEIO-540, HIO-540, IO-540, 0-540, and TIO-540 series engines | (1) Riveted | (i) 100 or more hours time-since-new or overhaul (TSN) or if the TSN is unknown (ii) Fewer than 100 hours TSN | Within 10 hours time-in-service (TIS) after the effective date of this AD. Before accumulating 100 hours TSN. |
| (2) Snap ring | (i) 450 or more hours TSN (ii) Fewer than 450 hours TSN | Within 50 hours TIS after the effective date of this AD. Before accumulating 500 hours TSN. |
(g) Replace any impulse coupling assembly that fails the inspection with a serviceable riveted or snap-ring impulse coupling assembly. Paragraphs 2 through 2.6 of the Detailed Instructions of TCM MSB No. MSB645, dated April 4, 1994 contain information on replacing the impulse coupling assembly.
(h) If you replace a snap-ring impulse coupling assembly with a riveted-impulse coupling assembly, strike out the “A” on the magneto data plate.
(i) For all magnetos that have a P/N listed in Table 1 of TCM MSB No. MSB645, dated April 4, 1994, that have had an initial inspection as specified in paragraph (f) of this AD, perform repetitive inspections of the impulse coupling assembly for wear using paragraphs 1.2 through 1.4.5 of the Detailed Instructions of TCM MSB No. MSB645, dated April 4, 1994. Use the following Table 2 for the compliance times. Snap-ring impulse coupling assemblies will have an “A” stamped in the lower-right quarter of the magneto data plate.
| Engine model | Type of impulse coupling assembly | Inspect |
|---|---|---|
| Lycoming AEIO-540, HIO-540, IO-540, 0-540, and TIO-540 series engines. | (1) Riveted (2) Snap ring | Within 100 hours time-since-last inspection (TSLI). Within 500 hours TSLI. |
(j) Replace any impulse coupling assembly that fails the inspection with a serviceable riveted or snap-ring impulse coupling assembly. Paragraphs 2 through 2.6 of the Detailed Instructions of TCM MSB No. MSB645, dated April 4, 1994 contain information on replacing the impulse coupling assembly.
(k) If you replace a snap-ring impulse coupling assembly with a riveted-impulse coupling assembly, strike out the “A” on the magneto data plate.
(l) Installing a “Shower-of-Sparks” ignition system in place of a magneto system that has a riveted-impulse coupling assembly or a snap-ring impulse coupling assembly ends the repetitive inspection requirements specified in paragraph (i) of this AD. You can find more information on installing a “Shower-of-Sparks” ignition system in TCM Service Information Letter No. SIL648, dated October 18, 1994.
(m) To assist owners and operators, the description of the magneto numbering system used for TCM S-20, S-1200, D-2000, and D-3000 series magnetos is in the following Table 3:
| Code: | Signifies: |
|---|---|
| S or D | Ignition Type (Single or Dual) |
| 6 | Number of Cylinders |
| L or R | Direction of Rotation (Left-hand or Right-hand) |
| N (Not used on SC Models) | Manufacturer Designation |
| SC (if applicable) | Short Cover Configuration |
| -25, -1209, or -3200 | Magneto Series |
| Examples: | Description: |
| S6LN-1209 | Single type ignition, 6-cyclinder engine, left-hand rotation, TCM (formerly Bendix), S-1200 series |
| D6RN-3200 | Dual type ignition, 6-cylinder engine, right-hand rotation, TCM (formerly Bendix), D-3000 series |
| S6LSC-25 | Single type ignition, 6-cylinder engine, left-hand rotation, short cover configuration, S-20 series |
(n) The Manager, Atlanta Aircraft Certification Office, has the authority to approve alternative methods of compliance for this AD if requested using the procedures found in 14 CFR 39.19.
(o) TCM SB No. 639, dated March 1993, contains additional information for replacing impulse coupling assemblies on a TCM magneto. TCM Service Information Letter No. SIL648, dated October 18, 1994, contains information for converting an engine to a “Shower-of-Sparks” ignition system.
(p) You must use Teledyne Continental Motors Mandatory Service Bulletin No. MSB645, dated April 4, 1994 to perform the inspections and replacements required by this AD. The Director of the Federal Register approved the incorporation by reference of this service bulletin as of July 18, 1996 (61 FR 29934, June 13, 1996). You can get a copy from Teledyne Continental Motors, P.O. Box 90, Mobile, AL 36601; telephone (334) 438-3411. For the Teledyne Continental Motors Web site: Go to http://www.TCMLINK.com. You can review copies at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_ register/code_of_ federal_regulations/ ibr_locations.html.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Appliances and equipment
