MikeOH Posted October 27, 2021 Report Posted October 27, 2021 Well, I habitually turn the key "OFF" before shutdown....and after this afternoon's flight nothing happened; engine kept right on running! Wiggling showed it was intermittent, and did goofy things with the Horizon electronic tach when on left or right, and the 'red' LED lit up on the tach, too. Previous run-up and the flight itself had been fine. Anyway, sounds like it's time for a new switch. Looking in the Mooney Parts Manual show the Bendix P/N: 10-357210-9, but I can't seem to find that part number at Spruce or Chief, or even a Google search. Help in finding the correct switch part number would be most appreciated! Thanks Quote
Robert Hicks Posted October 27, 2021 Report Posted October 27, 2021 I’ve got one I just pulled out of my airplane for an upgrade. I’ll give it to you for a 30 pack and shipping if you want. Quote
Ragsf15e Posted October 27, 2021 Report Posted October 27, 2021 Might want to check and see if there’s a loose wire back there. Also, I think theres a kit to rebuild them. Just options for you. 1 Quote
Guest Posted October 29, 2021 Report Posted October 29, 2021 Search for Continental manual X43002-1, Ignition switches and door lock manual. Clarence Quote
Prior owner Posted October 31, 2021 Report Posted October 31, 2021 As long as the rest of the switch is airworthy (the key cannot be removed in any position other than “off” and the switch operates smoothly) the rebuild kit is a great way to go. They periodically come up on eBay as well… IMHO quality control on the new TCM switches is hit and miss- so if you elect to buy a new one, I would recommend testing all functions (including having the lock cylinder smoothly return to “Both” after pushing to start) prior to installing it in order to avoid great frustration… Quote
DCarlton Posted October 31, 2021 Report Posted October 31, 2021 Pretty sure I bought an ignition and lock set at Aircraft Spruce about 10 years ago for my '67F. Works fine. Looks like they still have it. Quote
MikeOH Posted November 1, 2021 Author Report Posted November 1, 2021 Just an update. Doesn't look like the switch is to blame. We ohmmed out the switch in all positions. The problem was found to be an open shield wire on the left mag retard lead; the wires on the shield braid had frayed open. Thing is, it is not clear why that would prevent the mags from grounding when the ignition switch was turned to OFF. But, after grounding the shield properly, all problems went away. I am concerned something else is amiss and the open shield causing a failure is more of a clue than the solution. 1 Quote
carusoam Posted November 1, 2021 Report Posted November 1, 2021 Great follow-up Mike! Thanks for sharing the details. Got to put that in the memory banks for saving money… Some Bendix switches last 40+ years and several thousand flight hours…. Rebuild kits are available too… Then there are those new fangled keyless mag switches that look really cool and are easy to operate… Best regards, -a- Quote
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