Looking for M20J airspeed safety switch

[PierreL]

Hello all,

I am looking for an airspeed safety switch for a 1989 M20J and after contacting some Mooney service centers and Lasar it seems a bit tricky.

Reference is 880013-507.

Let me know which companies could supply these parts or if anyone knows an equivalent?

Many Thanks

[47U]

9 minutes ago, PierreL said:

I am looking for an airspeed safety switch for a 1989 M20J and after contacting some Mooney service centers and Lasar it seems a bit tricky.

Reference is 880013-507.

Found one on controller.com… but it’s in Germany.

[haymak3r]

I think this is what you're after:

 

[PierreL]

17 minutes ago, 47U said:

Found one on controller.com… but it’s in Germany.

Many thanks I will contact them if I cannot find it in the US.

[201Mooniac]

Seems like a great use for VARMA

[PierreL]

2 hours ago, haymak3r said:

I think this is what you're after:

 

VEP V21614 drawing indicates Mooney P/N 880013-505

The one I am looking for is 880013-507. So I am not sure it is compatible.

[haymak3r]

agreed. Was hoping that link would get you to where you can find the right one though. Good luck.

[KSMooniac]

My J uses a squat switch on the MLG instead of the airspeed switch, but many years ago I added a generic TCW airspeed switch to trigger a hobbs meter to record flight time.  It works great, was relatively inexpensive, and could probably be adapted to replace the unobtanium Mooney switch under VARMA.

[Fly Boomer]

2 hours ago, 201Mooniac said:

Seems like a great use for VARMA

Has anyone expended the time and effort required for VARMA, and actually received a VARMA letter?

[KSMooniac]

I half-watched an EAA webinar on Wednesday evening on the topic, but haven't tried it myself yet.  I would encourage every owner to go watch it as I believe they're archived, and count for WINGS credit in case that is useful for anyone.  I believe it was developed for exactly this type of situation.

[PT20J]

5 hours ago, PierreL said:

after contacting some Mooney service centers and Lasar it seems a bit tricky.

Define "tricky."

 

[PierreL]

9 minutes ago, PT20J said:

Define "tricky."

 

Difficult to find

[Ragsf15e]

5 minutes ago, PierreL said:

Difficult to find

It’s one of the parts that scares me about my Mooney.  Even with the factory making parts, there are a few things that seem to be unobtainable… new gears for the dukes electric gear, airspeed switches, etc.  

I thought there was a way to take the asss apart and replace the seals though, no?

Edited August 18, 2023 by Ragsf15e

[PT20J]

1 minute ago, PierreL said:

Difficult to find

The IPC pdf has the following comment: S/N 24-0001 thru 24-1685 order 880013-505 (All earlier 14V)
S/N 24-1686 thru 24-TBA order 880013-507 (later 14V and All 28V)

I would contact Frank Crawford at Mooney and ask about the difference (he maintains the IPCs and wrote the comment). I'm pretty sure VEP made both of the switches. Frank might be willing to cross reverence the VEP part number for the -507 if the -505 won't work.

fcrawford@mooney.com
(830)792-2920

 

 

[PierreL]

32 minutes ago, PT20J said:

The IPC pdf has the following comment: S/N 24-0001 thru 24-1685 order 880013-505 (All earlier 14V)
S/N 24-1686 thru 24-TBA order 880013-507 (later 14V and All 28V)

I would contact Frank Crawford at Mooney and ask about the difference (he maintains the IPCs and wrote the comment). I'm pretty sure VEP made both of the switches. Frank might be willing to cross reverence the VEP part number for the -507 if the -505 won't work.

fcrawford@mooney.com
(830)792-2920

 

 

Many thanks I just send him an email

[Larry]

Wasn't Don Maxwell replacing the diaphragm on the Airspeed Safety Switches?

It may be worth a call.

 

[Fly Boomer]

3 hours ago, PT20J said:

The IPC pdf has the following comment: S/N 24-0001 thru 24-1685 order 880013-505 (All earlier 14V)
S/N 24-1686 thru 24-TBA order 880013-507 (later 14V and All 28V)

I would contact Frank Crawford at Mooney and ask about the difference (he maintains the IPCs and wrote the comment). I'm pretty sure VEP made both of the switches. Frank might be willing to cross reverence the VEP part number for the -507 if the -505 won't work.

fcrawford@mooney.com
(830)792-2920

 

 

FWIW the K-model IPC says

2-  52  880013-503  .SWITCH, AIRSPEED SAFETY  V/   1
2-  52  880013-507  .SWITCH, AIRSPEED SAFETY  VI/  1

and under EFFECTIVITIES

V   25-0001 THRU 25-0446
VI  25-0447 THRU 25-TBA

Could it be that the 507 was just a version of the switch that could run from 10-30 volts?

 

[PT20J]

12 minutes ago, Fly Boomer said:

FWIW the K-model IPC says

2-  52  880013-503  .SWITCH, AIRSPEED SAFETY  V/   1
2-  52  880013-507  .SWITCH, AIRSPEED SAFETY  VI/  1

and under EFFECTIVITIES

V   25-0001 THRU 25-0446
VI  25-0447 THRU 25-TBA

Could it be that the 507 was just a version of the switch that could run from 10-30 volts?

 

I don't know what the difference is but I doubt it has anything to do with the bus voltage. The voltage spec on switches is related to arcing which shouldn't be an issue at these low voltages.

[Fly Boomer]

2 minutes ago, PT20J said:

I don't know what the difference is but I doubt it has anything to do with the bus voltage. The voltage spec on switches is related to arcing which shouldn't be an issue at these low voltages.

The specifications for one of their switches is 10-30 volts.  It made me wonder if there were low-voltage-only switches in the past.

[1980Mooney]

On 8/18/2023 at 6:43 PM, PT20J said:

I don't know what the difference is but I doubt it has anything to do with the bus voltage. The voltage spec on switches is related to arcing which shouldn't be an issue at these low voltages.

Correct.  The difference is in the "Increasing Pressure" and the "Decreasing Pressure" settings of the switch. 

It looks like the same switch just with different calibration.  Both switches are rated for 10-30 volts. DC.

880013-505  Increasing Pressure = 2.8 +/- 0.4 " H20  Decreasing Pressure = > 1.4" H2O

880013-507  Increasing Pressure = 2.4 +/- 0.4 " H20  Decreasing Pressure = > 1.6" H2O

Edited August 20, 2023 by 1980Mooney

[PT20J]

On 8/18/2023 at 6:47 AM, PierreL said:

Hello all,

I am looking for an airspeed safety switch for a 1989 M20J and after contacting some Mooney service centers and Lasar it seems a bit tricky.

Reference is 880013-507.

Let me know which companies could supply these parts or if anyone knows an equivalent?

Many Thanks

Do you know if the problem is the diaphragm or the microswitch? These units have two microswitches. One is used for the gear and the other is for a flight timer or some other accessory that is often not installed. If the microswitch is bad, you might be able to just switch the landing gear circuit to the other switch. 

[PierreL]

12 hours ago, 1980Mooney said:

Correct.  The difference is in the "Increasing Pressure" and the "Decreasing Pressure" settings of the switch. 

It looks like the same switch just with different calibration.  Both switches are rated for 10-30 volts. DC.

880013-505  Increasing Pressure = 2.8 +/- 0.4 " H20  Decreasing Pressure = > 1.4" H2O

880013-507  Increasing Pressure = 2.4 +/- 0.4 " H20  Decreasing Pressure = > 1.6" H2O

Many thanks.

looks like VEP reference for 880013-507 is 656-3. I will contact world magnetics asking for this reference.

[PierreL]

11 hours ago, PT20J said:

Do you know if the problem is the diaphragm or the microswitch? These units have two microswitches. One is used for the gear and the other is for a flight timer or some other accessory that is often not installed. If the microswitch is bad, you might be able to just switch the landing gear circuit to the other switch. 

Thank you PT20J.

i have seen this microswitch swap method on Mooneyspace. I will try it at next visit. If the problem comes from the diaphragm or the seal it seems more difficult to fix. 

[DCarlton]

My airspeed safety switch stuck a few years ago. We were able to remove it, remove the center screw I think, put a drop of mouse milk (I think) in it , and get it working on the bench.  Reinstalled and it's worked fine ever since (long enough for me to forget the details).  Have no idea if opening the switch creates a paper trail problem, but we got it working.  Might be worth a try.   Then there's the $$$$ World Magnetics option...  

Edited August 20, 2023 by DCarlton

[PT20J]

10 minutes ago, DCarlton said:

My airspeed safety switch stuck a few years ago. We were able to remove it, remove the center screw I think, put a drop of mouse milk (I think) in it , and get it working on the bench.  Reinstalled and it's worked fine ever since (long enough for me to forget the details).  Have no idea if opening the switch creates a paper trail problem, but we got it working.  Might be worth a try.   Then there's the $$$$ World Magnetics option...  

Are you saying you removed the cap and accessed the microswitches, or the large screw on the other side? The large screw adjusts the spring tension to set the calibration. 
https://www.knr-inc.com/shop-talk-articles.html?view=article&id=93&catid=25