On Monday, December 9, 2019 at 11:48:33 PM UTC-7, 2G wrote:
On Monday, December 9, 2019 at 2:45:07 PM UTC-8, BG wrote:
On Saturday, December 7, 2019 at 9:27:51 AM UTC-8, Dave Nadler wrote:
I've been persuaded to give an OSTIV talk about motorglider safety issues,
in particular propulsion system failures. I'm going to discuss
common failures, the systemic reasons this stuff has happened and
WILL CONTINUE to happen, and some ideas for systemic improvements.

I'm looking for pictures and/or documentation of failures, for example:
- failed position switches (ie limit switches, prop position sensor)
- failed fuel systems (improper hoses, routing, leak sources, etc)
- failed structural components (cracked exhaust, mounts, pylons, etc)
- failed drive belts
- failed electrical connectors
- failed motor controller
- failed electronics
and anything else you might happen to have.

Ideally a good photo, make and model, approximate date, brief description.
Please email to me offline.

Thanks in advance for the help!
Best Regards, Dave

PS: Probably time to redo this study, but situation isn't that much changed:
http://www.nadler.com/public/DeRese_...ilplanes.p df

In the late 80's a DG 400 taking off from El Tiro lost his prop after the bolts sheared off. It was concluded the wooden prop had shrunk and the bolts were free to move. It happened about 1000AGL, those of us who were watching heard the engine rev really high then a shut down followed by call on the radio for a emergency landing. The prop walked down the wing hitting it three times, the last hit near the end went through the top and bottoms skins. All was OK on landing.

DR Jack's ASW 26e had a fire in the engine bay that nearly burnt the tall boom off. A belt came apart and cut a fuel line. He stayed with the plane till landing. As I was in the shop, the repair people were amazed it did not break off, the composited was completely burned through in most places.

My worse events in my DG 800b were a failure of the uphaul motor so I could not retract the engine and second was a contamination in the fuel line after they were replaced. Debris kept the needle valve open so the engine was flooding on a air restart. Using full throttle it would run, preventing a landout

BG

Dr Jack's in-flight fire was the scariest incident I have heard of. Does anyone know if he shut off fuel after the start of the fire?

Tom

Haven't there been 3-4 Stemme in-flight fires world wide?

Frank