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- What is the overhaule interval of magnetos?
- My magnetos reached the TBO but run without any problem, why should they be inspected?
- My magnetos only run a couple of hours in the last years, should they be checked?
- What is going to be checked at a 500h/ 4 years inspection?
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What is the overhaul interval of magnetos?
TCM Bendix
Time between overhaul (TBO) is 500 hours or 4 years, whatever comes first. (Since the
upcoming of SB643A TCM the ignition harness, The starter vibrator and the ignition switch
are also included in these intervals)
Unision/Slick
for all engines with two ignition systems after a time of 500 hours;
for all single ingnition systems after a time of 2 years or 250 hours;
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My magnetos reached the TBO but run without any problem, why should they be inspected?
In aerospace we most times talk about inspection not repair. It’s like it should be at every inspection. The FBO should inspect if every part is still working proper, and he should make sure that axels or bearings run smooth and get new grease and Oil. A lot of smaller defects don’t show up at first. The shrinking power is most times not recognized because it comes slowly. Other problems are shown right at the start of the engine. Or they cause a higher consumption.
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My magnetos only run a couple of hours in the last years, should they be checked?
Yes, this regulations are airworthiness directives.
A mayor problem of the general aviation is the small runtime of the aircraft engines and aggregates. A lot of parts wear more because of rust than because of working. An inspection is always recommendable.
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What is going to be checked at a 500h/ 4 years inspection?
This question has to be answered separately for the two main magnetos Unison/Slick and TCM/Bendix.
Unison/Slick
The magneto is going to be mostly disassembled and cleaned. All parts are proved for applicable SB’s (Service Bulletin)
The ignition coil and the condenser are tested for their electrical tolerances and with a separate tester for hardware defects. The distributor block and the distributor gear electrode are cleaned from contaminants. All parts are visually – if needed with a 3D microscope – checked. The main contact, cam, screws of the main contact and gaskets for pressurized magnetos are replaced.
After the assembly the magneto is tested with different speeds on our magneto bench.
Every part of our control is written down at a detailed maintenance report including all tolerances required. You will receive an EASA FORM ONE with every inspected magneto.
TCM/Bendix
The magneto is completely disassembled and cleaned. All parts are checked for SB’s and LTA’S (German airworthiness directives). The housings are sandblasted and newly varnished (priming & varnishing) if they are in bad conditions.
The ignition coil and the condenser are also tested for their electrical tolerances and with a separate tester for hardware defects. The distributor block and the distributor gear electrode are cleaned from contaminants. Afterwards the distributor block will be deoiled, cleaned and oil again at 100 degree Celsius (the oiling takes one hour in the oven). Depending on the material of the distributor block it will receive new doping. All other components are cleaned in an ultrasonic wash-basin. Replaced are the main contact, felt strip and –washer, self-locking screws and the spring for the impulse coupling. Newly lubricated the magneto will be assembled.
After the assembly the magneto is tested with different speeds on our magneto bench.
Every part of our control is written down at a detailed maintenance report including all tolerances required. You will receive an EASA FORM ONE with every inspected magneto.
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