# JASC 7414: Magneto/Distributor

- Type: JASC system/component code (FAA)
- ATA chapter: 74 Ignition
- Title in the code table: MAGNETO/DISTRIBUTOR
- Service difficulty reports: 2,447
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=64
- Page: https://openairdocs.org/jasc/7414

## What it covers

The components which generate and distribute a high voltage to spark plugs in reciprocating engines for fuel/air combustion. Typical parts are coil, breaker points, gear, bearing, contact finger, distributor block, frame, impulse coupling, condenser, rotor, cam, electrode, seal, etc.

## Service difficulty reports (2,447, newest 50)

- [SDR 2026FA0000879](https://openairdocs.org/sdr/2026FA0000879), Oct 20, 2026: IMPULSE COUPLING. SHEARED. IMPULSE COUPLING FAILED ON SLICK 4373 MAGNETO. MAGNETO HAD 230 HOURS AND 123 START CYCLES SINCE 500 HOUR IRAN. TOTAL TIM (N797DL)
- [SDR 2026FA0000787](https://openairdocs.org/sdr/2026FA0000787), Sep 25, 2026: Gulstm GA7. IMPULSE COUPLING. DESTROYED. LOOSE RIVETS ON IMPULSE COUPLING THAT HOLD THE PAWLS ONTO THE PLATE. SMALL CONTACT DAMAGE TO UNDERSIDE OF MAGNETO FACE B (N797GA)
- [SDR 2026FA0000795](https://openairdocs.org/sdr/2026FA0000795), Sep 7, 2026: Piper PA28140. MAGNETO. FAULTED. DURING FLIGHT, THE ENGINE EXPERIENCED A SMOOTH PARTIAL LOSS OF POWER WITH AN RPM DECREASE OF APPROX 200–400 RPM. DISCONT (N1416T)
- [SDR 2026FA0000684](https://openairdocs.org/sdr/2026FA0000684), Sep 5, 2026: Cessna 172S. SEAL. FAILED. AFTER COMPLETION OF THE ANNUAL INSPECTION, WE PERFORMED A POST INSPECTION RUN. DURING IDLE WE CHECKED EACH MAGNETO AND F (N225WS)
- [SDR 2026FA0000662](https://openairdocs.org/sdr/2026FA0000662), Aug 23, 2026: Cessna 170B. POINTS. DEFECTIVE. THE ENGINE INTERMITTENTLY RAN ROUGH ON THE RIGHT MAG CHECK AND WOULD OCCASIONALLY COMPLETELY CUT OUT BUT THE EGT'S DIDN' (N2711C)
- [SDR 2026FA0000596](https://openairdocs.org/sdr/2026FA0000596), Jul 17, 2026: IMPULSE COUPLING. LOOSE. IMPULSE COUPLING CAM ASSEMBLY HAS LOOSE RIVETS SIMILAR TO THOSE FOUND WITHIN SB2-19A & AD 99-04-04. OUTSIDE OF S/N RANGE
- [SDR 2026FA0000595](https://openairdocs.org/sdr/2026FA0000595), Jul 17, 2026: IMPULSE COUPLING. LOOSE. IMPULSE COUPLING CAM ASSEMBLY HAS LOOSE RIVETS SIMILAR TO THOSE FOUND WITHIN SB2-19A & AD 99-04-04. OUTSIDE OF S/N RANGE
- [SDR 2026FA0000631](https://openairdocs.org/sdr/2026FA0000631), Jul 8, 2026: Beech V35. IMPULSE COUPLING. DESTROYED. THE PILOT/OWNER ATTEMPTED TO START THE PLANE. AFTER THE FIRST FAILED START, THE PROPELLER STOPPED SPINNING DURING THE SE (N231S)
- [SDR 2026FA0000593](https://openairdocs.org/sdr/2026FA0000593), Jul 8, 2026: Cessna 172M. IMPULSE COUPLING. SHEARED. AIRCRAFT REPORTED TO BE HARD TO START OVER MULTIPLE STARTS. DURING 100HR INSPECTION REMOVED LEFT MAGNETO P/N 4371 AND DI (N5367H)
- [SDR 2026FA0000419](https://openairdocs.org/sdr/2026FA0000419), May 20, 2026: Piper PA28140. MAGNETO. OUT OF ADJUST. ENGINE WAS INSTALLED JULY 2025. TIME SINCE OVERHAUL IS 100 HOURS. FOUND ENGINE DAMAGE DUE TO LEFT MAG BEING ADVANCED 15  (N556PA)
- [SDR 2026FA0000408](https://openairdocs.org/sdr/2026FA0000408), May 19, 2026: Gulstm GA7. IMPULSE COUPLING. UNSERVICEABLE. MAGNETO REMOVED FOR IMPULSE COUPLING INSPECTION. CHAMPION PRODUCED IMPULSE COUPLING FOUND INSTALLED. BOTH RIVETS HOLDING (N797GA)
- [SDR 2026FA0000578](https://openairdocs.org/sdr/2026FA0000578), Apr 27, 2026: Cirrus SR20. MAGNETO. FAILED. PILOT REPORTED NO START. MAINTENANCE CONFIRMED NO START. CHECKED POWER TO SLICK START, OKAY. CHECKED MAGNETO TO ENGINE T (N662JJ)
- [SDR 2026FA0000201](https://openairdocs.org/sdr/2026FA0000201), Mar 20, 2026: Cessna 172M. IMPULSE COUPLING. DEFECTIVE. MAGNETO PULLED DURING ROUTINE MAINTENANCE TO CHECK FOR THE PRESENCE OF A CHAMPION MANUFACTURED IMPULSE COUPLING. ONE WAS (N314AV)
- [SDR 2026FA0000173](https://openairdocs.org/sdr/2026FA0000173), Mar 11, 2026: Cessna 172R. COIL. BENT. UNDER NORMAL FLIGHT OPERATIONS, AT FIRST ROUTINE 500-HOUR INSPECTION FOUND COIL TAB WORN OUT OF LIMITS BECAUSE THE TAB W
- [SDR 2026FA0000157](https://openairdocs.org/sdr/2026FA0000157), Mar 4, 2026: Piper PA32300. DOWEL PIN. SHEARED. THE MAGNETO IMPULSE COUPLER LOCKED UP AND BROKE THE GEARS INSIDE THE BACK OF THE ENGINE. THIS SHEARED THE DOWEL PIN IN T (N4181W)
- [SDR 2026FA0000064](https://openairdocs.org/sdr/2026FA0000064), Jan 29, 2026: MAGNETO. FAILED. SLICK MAGNETO (MODEL NR 6350 S/N 15087263) FOLLOWER ARM OF CONTACTOR POINTS BROKE AFTER 76 HOURS SINCE NEW. THE BREAK OC
- [SDR 2026FA0000198](https://openairdocs.org/sdr/2026FA0000198), Jan 23, 2026: Cessna 172S. IMPULSE COUPLING. DESTROYED. PILOT REPORT OF FLUCTUATING RPM'S WHILE IN CRUISE FLIGHT, PLUS OR MINUS 400RPM. DURING GROUND RUN FOR TROUBLESHOOTING, R (N126AV)
- [SDR 2026FA0000226](https://openairdocs.org/sdr/2026FA0000226), Nov 17, 2025: Cessna 150. MAGNETO. FAILED. WHILE REDUCING POWER ON LANDING, ENG RAN VERY ROUGH. AFTER LANDING MAGNETO CHECK CAUSE LARGE DROP IN RPMS ON BOTH MAGS. 
- [SDR YENA2025100200990](https://openairdocs.org/sdr/YENA2025100200990), Oct 1, 2025: Airbus A321271NX. IGNITER. WORN. FLT#687, BOS-LAX. (ETOPS) ENGINE IGN 1 B FAULT ( IGNITION SYSTEMS B) SYSTEM B ); FOUND L ENG IGN-B IGNITER PLUG FULLY WO (N2169J)
- [SDR 8HBR20260215074](https://openairdocs.org/sdr/8HBR20260215074), Sep 26, 2025: Cessna 152. MAGNETO. MECHANIC ERROR. AIRCRAFT EXPERIENCED A TOTAL LOSS OF ENGINE POWER RESULTING IN AN UNSCHEDULED LANDING. AFTER THE RH MAGNETO WAS CHANGED  (N89312)
- [SDR 8HBR20260215073](https://openairdocs.org/sdr/8HBR20260215073), Sep 26, 2025: Cessna 152. MAGNETO. MISMANUFACTURED. PILOT EXPERIENCED A TOTAL ENGINE FAILURE. UPON INSPECTION IT WAS FOUND THAT THE RH MAGNETO WAS ASSEMBLED INCORRECTLY, CA (N89312)
- [SDR 2025FA0000636](https://openairdocs.org/sdr/2025FA0000636), Aug 26, 2025: Mooney M20J. IMPULSE COUPLING. FAILED. I HAVE NOW HAD 2 QUALITY AICRAFT ACCESSORIES (QAA/HARTZELL)-OVERHAULED SLICK 4372 MAGNETOS W/ IMPULSE COUPLINGS VIOLENTL (N374SM)
- [SDR 2025FA0000559](https://openairdocs.org/sdr/2025FA0000559), Aug 20, 2025: MAGNETO. FAILED. LOSS OF POWER IN FLIGHT. MAGNETO FAILURE (N120N)
- [SDR 3EJA202508200002](https://openairdocs.org/sdr/3EJA202508200002), Aug 4, 2025: Cessna 525B. PICKUP. UNKNOWN. TESTED THE ANTI ICE SYSTEMS DURING CLIMB. ACTIVATED ANTI-ICE SYSTEMS PRIOR TO ENTERING AND EXPERIENCED MODERATE ICING CO (N799JS)
- [SDR 2025FA0000513](https://openairdocs.org/sdr/2025FA0000513), Jul 23, 2025: Cirrus SR22T. MAGNETO. FAILED. PILOT OBSERVED #4 CYLINDER INDICATING IN THE RED. PERFORMED UNSCHEDULED LANDING AT KBOI. LOCAL FBO PERFORMED TROUBLESHOO (N822R)
- [SDR 2025FA0000529](https://openairdocs.org/sdr/2025FA0000529), Jul 18, 2025: Cirrus SR22T. FILTER. MELTED. PRESSURIZED MAGNETO AIR SOURCE FILTER MELTED/DEFORMED AFTER ONLY 79H AFTER INSTALLATION. BLOCKAGE OF AIR TO MAGNETO CAUS
- [SDR 2026FA0000200](https://openairdocs.org/sdr/2026FA0000200), Jun 30, 2025: Piper PA30. IMPULSE COUPLING. DESTROYED. PILOT REPORT OF HEARING A BANG AT STARTUP. WHILE BRINGING THE PLANE TO THE MAINTENANCE SHOP ACROSS THE AIRFIELD, THE PIL (N2VQ)
- [SDR 2026FA0000199](https://openairdocs.org/sdr/2026FA0000199), Jun 25, 2025: Piper PA39. IMPULSE COUPLING. DESTROYED. I HEARD THE ENGINE BACKFIRE A FEW TIMES DURING TAKEOFF/INITIAL CLIMB OUT AROUND 6/20/2025. PLANE WAS BROUGHT TO MAINTENA (N24TE)
- [SDR 2025FA0000401](https://openairdocs.org/sdr/2025FA0000401), Jun 6, 2025: Cessna T182. HOUSING. FAILED. I HAD THE ELECTROAIR DUAL EIS INSTALLED BY THEIR RECOMMENDED INSTALLER. I HAD 3 NEW SEPARATE MTH (MAG TIMING HOUSING) FA (N93HB)
- [SDR 2025FA0000286](https://openairdocs.org/sdr/2025FA0000286), Apr 22, 2025: Cessna 172R. IMPULSE COUPLING. BROKEN. WHILE PERFORMING HARTZELL AVIATION ALERT S.B. NO. 225 IT WAS FOUND ON MAGNETO S/N H-Y103862 HAD A BROKEN IMPULSE CAM ASS (N42007)
- [SDR 2025FA0000265](https://openairdocs.org/sdr/2025FA0000265), Apr 12, 2025: Cessna 150H. MAGNETO. DEFECTIVE. LARGE MAG DROP ON RUNUP THAT WAS SIGNIFICANT ENOUGH TO ALMOST SHUT DOWN THE ENGINE. MAGNETO HAD 568.9 HOURS SINCE INSTAL (N7144S)
- [SDR 2025FA0000262](https://openairdocs.org/sdr/2025FA0000262), Apr 11, 2025: Piper PA44180. IMPULSE COUPLING. FAILED. IN FLIGHT, RH ENGINE SUFFERED PARTIAL OIL PRESSURE LOSS. PRECAUTIONARY LANDING MADE AT KOXB. TROUBLESHOT LOSS OF OIL PRE (N8024Q)
- [SDR 2025F00056](https://openairdocs.org/sdr/2025F00056), Mar 1, 2025: Piper PA32260. MAGNETO. FAILED. RUN UP ENGINE WENT DOWN WHEN TESTING. (N852VL)
- [SDR 2025FA0000103](https://openairdocs.org/sdr/2025FA0000103), Feb 12, 2025: Piper PA44180. MAGNETO. CONTAMINATED. THE MAGNETO WAS FOUND TO HAVE A LARGE AMOUNT OF GREASE ON THE CAM, ENOUGH TO EASILY SLING INTO THE POINT ASSEMBLY WHICH  (N5823A)
- [SDR 2025FA0000105](https://openairdocs.org/sdr/2025FA0000105), Feb 11, 2025: Piper PA44180. MAGNETO. CONTAMINATED. THE MAGNETO ROTOR SHEARED, THE MAGNETO DROPS DURING A CHECK WERE FOUND TO BE VERY HIGH. WHEN THE MAGNETO WAS REMOVED FRO (N834AT)
- [SDR 2025FA0000104](https://openairdocs.org/sdr/2025FA0000104), Feb 11, 2025: Piper PA44180. MAGNETO. CONTAMINATED. THE MAGNETO WAS FOUND TO HAVE A LARGE AMOUNT OF GREASE ON THE CAM, ENOUGH TO EASILY SLING INTO THE POINT ASSEMBLY WHICH  (N834AT)
- [SDR 2025FA0000140](https://openairdocs.org/sdr/2025FA0000140), Jan 24, 2025: Cirrus SR22T. MAGNETO. FAULTED. THE COMMERCIAL STUDENT ON BOARD WAS PERFORMING THE DUTIES OF PILOT IN COMMAND (PIC) WHILE A CERTIFIED FLIGHT INSTRUCTOR  (N81DX)
- [SDR 2025FA0000071](https://openairdocs.org/sdr/2025FA0000071), Dec 26, 2024: STOP PIN. LOOSE. CUSTOMER BROUGHT AIRCRAFT WITH ENGINE WITH DIFFICULTY LEANING ENGINE WITHOUT HAVING THE ENGINE REACH A VERY HIGH TIT. EN (N688C)
- [SDR 2024FA0000751](https://openairdocs.org/sdr/2024FA0000751), Oct 3, 2024: Cessna 402C. IMPULSE COUPLING. FAILED. IMPULSE COUPLING FAILURE CAUSED RT MAGNETO TO BE INOPERATIVE AND METAL CONTAMINATION OF ENGINE.
- [SDR 2024FA0000741](https://openairdocs.org/sdr/2024FA0000741), Sep 25, 2024: Cessna R182. MAGNETO. MAKING METAL. RECENTLY INSTALLED ELECTROAIR ELECTRONIC IGNITION SYSTEM EIS-61000-5M AND EIS-61000-5C. WHILE TROUBLE SHOOTING ERRONEOUS (N756MN)
- [SDR FQAR202409251214](https://openairdocs.org/sdr/FQAR202409251214), Sep 25, 2024: Piper PA44180. SHAFT. SHEARED. MAGNETO REMOVED AFTER 67 HRS IN SERVICE SINCE LAST 500HR INSPECTION, UPON DISSASSEMBLY FOUND THE DRIVE END OF THE ROTATI (N302PA)
- [SDR 8HBR20240909065](https://openairdocs.org/sdr/8HBR20240909065), Sep 9, 2024: Robsin R22BETA. BEARING. BROKEN. COIL TAB WAS BENT TOO FAR UP DURING MANUFACTURING INSTALLATION, WHICH CAUSED A DEEP ANGULAR DIVOT TO BE WORN IN THE COIL (N7148A)
- [SDR 8HBR20240909068](https://openairdocs.org/sdr/8HBR20240909068), Aug 27, 2024: Cessna 152. GEAR. DAMAGED. CAM GEAR WAS IMPROPERLY INSTALLED/SEATED DURING MANUFACTURE, WHICH CAUSED EXCESSIVE WEAR AND DAMAGE TO THE CAM GEAR DURI (N5318M)
- [SDR 2024FA0000627](https://openairdocs.org/sdr/2024FA0000627), Aug 16, 2024: Cessna T206H. MAGNETO. FAILED. MAGNETO FAILED (N501GW)
- [SDR 2024FA0000599](https://openairdocs.org/sdr/2024FA0000599), Aug 13, 2024: Cessna 172M. CASE HALF. WORN. REMOVED AND REPLACED RH MAGNETO DUE TO 500 HOUR OVERHAUL LIMIT. NEW MAGNETO INSTALLED FOR 78.2 HOURS BEFORE A FLIGHT WAS (N20565)
- [SDR 8HBR20240909067](https://openairdocs.org/sdr/8HBR20240909067), Aug 7, 2024: Cessna 172P. GEAR. DAMAGED. CAM GEAR WAS IMPROPERLY INSTALLED/SEATED DURING INITIAL MANUFACTURING WHICH CAUSED EXCESSIVE WEAR AND DAMAGE TO THE CAM  (N90558)
- [SDR 2024FA0000575](https://openairdocs.org/sdr/2024FA0000575), Aug 7, 2024: Cessna 206H. MAGNETO. FAILED. MAGNETO FAILED (N246N)
- [SDR 2024FA0000573](https://openairdocs.org/sdr/2024FA0000573), Aug 6, 2024: Cessna 206H. MAGNETO. FAILED. MAGNETO FAILED (N246N)
- [SDR 8HBR20240712063](https://openairdocs.org/sdr/8HBR20240712063), Jul 3, 2024: Robsin R22BETA. BEARING. BROKEN. PILOTS EXPERIENCED ENGINE ROUGHNESS IN AIR. UPON LANDING, MAINTENANCE FOUND MAGNETO WAS DIFFICULT TO SPIN AND CLUNKY IN  (N508AD)
- [SDR J4YR202407013652](https://openairdocs.org/sdr/J4YR202407013652), Jul 1, 2024: Piper PA28161. ROTOR SHAFT. BROKEN. DURING GROUND RUN IT WAS NOTICED THAT THE RIGHT MAGNETO WAS INOPERATIVE. UPON TROUBLESHOOTING THE TECHNICIAN REMOVED AND (N8248T)

All 2,447: https://openairdocs.org/jasc/7414/reports.md

## Other codes in chapter 74

- [JASC 7400](https://openairdocs.org/jasc/7400): Ignition System (249 reports)
- [JASC 7410](https://openairdocs.org/jasc/7410): Ignition Power Supply (89 reports)
- [JASC 7411](https://openairdocs.org/jasc/7411): Low Tension Coil (14 reports)
- [JASC 7412](https://openairdocs.org/jasc/7412): Exciter (300 reports)
- [JASC 7413](https://openairdocs.org/jasc/7413): Induction Vibrator (5 reports)
- [JASC 7420](https://openairdocs.org/jasc/7420): Ignition Harness (Distribution) (213 reports)
- [JASC 7421](https://openairdocs.org/jasc/7421): Spark Plug/Igniter (703 reports)
- [JASC 7430](https://openairdocs.org/jasc/7430): Ignition Switching (111 reports)
- [JASC 7497](https://openairdocs.org/jasc/7497): Ignition System Wiring (97 reports)

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