The International Cessna^® 170 Association

Should the oil temp bulb be safetied? Mine isn't drilled for safety wire. The housing it screws into is safetied just not the bulb itself. Ive always wondered about it. I put torque seal on it so I can visually see if it has loosened.

Thoughts?

My thoughts are that it is not logical that it does not have a safety.

There are thousands of small continental engines that have flown hundreds of thousands of hours without the bulb being safetied over the last 70 years. I say this as I've never seen one safetied and would expect as they don't come drilled, very few have taken it upon themselves to drill a safety hole so it could be safetied.

I admit I've left the bulbs loose and that makes a mess real quick. Maybe if I had to look forward to doing a safety on it I would have remembered to tighten it.

Have you ever heard of a temp bulb coming loose? I haven't. Perhaps it has. You'd think if it was a problem it would have been addressed maybe 60 years ago.

Now that I've thought this much about it I wonder if we don't safety way to may things we just don't need to.