New Mooney Flyer article on the infamous "no back" clutch spring

[toto]

I had never heard of this obnoxious little spring until I read the 2013 thread here on MS, which has great input from Don Kaye and others.  

There's a new article in this month's Mooney Flyer about the actuator spring, worth a quick read to refresh painful memories.

My least favorite technical topics are single points of failure with safety implications.  Yay.

SBM20-282-A.pdf

[Bob - S50]

2 hours ago, toto said:

I had never heard of this obnoxious little spring until I read the 2013 thread here on MS, which has great input from Don Kaye and others.  

There's a new article in this month's Mooney Flyer about the actuator spring, worth a quick read to refresh painful memories.

My least favorite technical topics are single points of failure with safety implications.  Yay.

SBM20-282-A.pdf 230.61 kB · 4 downloads

We just had ours changed a couple weeks ago.  We had put a bit over 1000 hours on the plane since we changed it last time about 6 years ago.

Hard buggers to find.  Our MSC ordered them and it took a couple months to get them.  Total cost, installed for us was about $1300.

[carusoam]

The best info came with pics from Andrew... aka @Hyett6420

the failure mode came from surface crack propagation... surface cracks appeared with age and use...

Avoiding them was probably improved process control for the materials... while building the spring.

There were certain years of springs to be avoided...

Spring technology isn’t that challenging.

Best regards,

-a-

[toto]

It's an unfortunate design decision, in any case - a little spring that can take out both primary and secondary gear extension functions.

[toto]

I'm going to try to link directly to your post with the photos... Wish me luck. 

 

[steingar]

Once again, Johnson bar for the win!

[Hank]

3 hours ago, steingar said:

Once again, Johnson bar for the win!

Until the handle comes apart when trying to lower the gear . . . .  Right, Ned? Rob

[rbridges]

1 hour ago, Hank said:

Until the handle comes apart when trying to lower the gear . . . .  Right, Ned? Rob

   The handle coming loose was a non-event fortunately.  I was ready to use my feet for a Fred Flinstone landing.  

[Hank]

2 hours ago, rbridges said:

   The handle coming loose was a non-event fortunately.  I was ready to use my feet for a Fred Flinstone landing.  

I understand that! A gear up would likely end my flying career . . . .

[jetdriven]

Isn’t the no back spring where only the replacement ones had failed? I mean a clock spring by design gets flexed twice a second for 60 years and doesn’t fail, I just don’t get it I guess