Looking for Stall Warning Switch

[moosebreath]

Mooney part number 800364-509 or Mooney Kit 940065-605 which I believe is the same thing.  The pivot points on my are worn out and it randomly sticks on in flight.  Currently the hanger elf has ... adjusted ... it.  I would like to replace it if one can be found for a resonable price.

[FloridaMan]

There are some on eBay right now. Not sure if it's the same part. 

[moosebreath]

This is for reference in case another person has to repair their switch.  The switch used in Mooney part number 800364-509 or kit 940065-605 is:

MicroSwitch (now Honeywell) V3-2451-D8  The only thing special about it
is a low activation force of 15 grams.

This part is obsolete but new old stock is currently available on Ebay for $22
each.

The functional equivalent Honeywell switch is the V7-5F17-D8  It has the
same electrical specs, activation force, and mounting.    $4.44 each
plus shipping from DigiKey.  I splurged and bought two.

NOTE:  The switch is wired between the normally open and common
contacts.

The stall vane and switch assembly is simple as dirt and the microswitch is easily replaced by even a junior hanger elf.  The current price from Mooney is over $500.

[KSMooniac]

Any idea if those switches work for 12V and 24V planes?  I'm too lazy to look that up myself right now.   Nice work finding a reasonable solution!  How much fun was it to R&R the switch?

[moosebreath]

The switch is rated for 125 volts so it will work on either a 24 or 12 volt system.  Access is through a plate on the lower wing surface behind the switch.  The assembly is held in place by two screws on the wing leading edge that engage a nut plate on the switch bracket. It is a simple matter to extract the switch assembly.  The microswitch is held to the bracket by two small screws.  The wires have spade lugs connecting them to the wiring harness so it can easily be totally removed.  I chose not to clip the tie wraps on the wires and simply soldered the leads to the new switch in place.  The whole job took me less than 30 minutes.  

Note that the speed at which the switch actuates is set by sliding the assembly vertically by loosening the wing attachment screws.  The vane itself is a hardened steel piece that is not meant to be bent for adjustment.

[takair]

51 minutes ago, moosebreath said:

The switch is rated for 125 volts so it will work on either a 24 or 12 volt system.  Access is through a plate on the lower wing surface behind the switch.  The assembly is held in place by two screws on the wing leading edge that engage a nut plate on the switch bracket. It is a simple matter to extract the switch assembly.  The microswitch is held to the bracket by two small screws.  The wires have spade lugs connecting them to the wiring harness so it can easily be totally removed.  I chose not to clip the tie wraps on the wires and simply soldered the leads to the new switch in place.  The whole job took me less than 30 minutes.  

Note that the speed at which the switch actuates is set by sliding the assembly vertically by loosening the wing attachment screws.  The vane itself is a hardened steel piece that is not meant to be bent for adjustment.

Do you happen to have photos?  Are you talking about a Safe Flight switch or is this something different?  The ones I have run into are riveted together and I never did find an equivalent switch.

[carusoam]

Nice follow-up, MB.

Best regards,

-a-

[moosebreath]

On the J model for serial number 3154 onward Mooney made their own switch assembly which is what I have.  I believe kit 940065-605 replaces the Safe Flight switch supplied on earlier serials with the Mooney made type. The $520 or so for the kit is still half what folks state they have paid for a new Safe Flight part.