(Throttle Control) Gear Warning Buzzer

[Matthew P]

Looking for information regarding the Gear Warning Buzzer that is tied to the Throttle Control that goes off if you pull the throttle back below 13" MP, looked in the service manual and POH but don't see it addressed. I do see the information about the buzzer tied to the air switch that will go off if you try to raise the gear below 80 mph.

TIA

 

Matt

[PeteMc]

In the M20J POH I looked at, it says approx. 12" MP  (13-15 for the 231).  If you have a PDF of your POH, try searching for "gear horn" and it should come up.

To check it, you pull the power back in flight with the gear up.  Adjustments might take a few flights if it got wacked or came loose and needed a major calibration. 

[phxcobraz]

Had to reinstall this when we put a new throttle in last year.

It's kind of a pain to adjust but very simple in design, it's just keyed off a position of the throttle. I got it set correctly after about 2 test flights.

[RescueMunchkin]

What info are you looking for on it? It's a little switch that's clamped to the throttle cable plunger housing behind the cluster on the non quadrant planes. I found mine a big pita to adjust because of getting the angle of screwdriver and socket behind the gaps for access. I believe the switch is open when the throttle plunger is pulled back past a certain point to break the circuit and activate the alarm.

[Matthew P]

25 minutes ago, RescueMunchkin said:

What info are you looking for on it? It's a little switch that's clamped to the throttle cable plunger housing behind the cluster on the non quadrant planes. I found mine a big pita to adjust because of getting the angle of screwdriver and socket behind the gaps for access. I believe the switch is open when the throttle plunger is pulled back past a certain point to break the circuit and activate the alarm.

Good evening, I found the switch shortly after buying it as the alarm would go off randomly regardless of throttle position, removed switch, cleaned it then readjusted it...was just looking for info about it as I couldn't find anything in the poh other than the witing diagram..was wanting to see if it mentioned a specific MP setting so when I change out the throttle cable I can make the proper adjustment..it's mentioned in the 20J and 201 poh but not the 20e poh, and the MP settings are different between the J and 201

Edited Thursday at 03:26 AM by Matthew P

[N201MKTurbo]

That switch is there for you, not for Mooney. It is to keep you from landing gear up. You know how your airplane flies. You can figure out where it needs to be set.

[RescueMunchkin]

Agreed - adjust it to your liking so that you don't gear up while coming in to land and does not come on during your normal non landing operations.

[RescueMunchkin]

Also if yours randomly comes on, a possibility is that the switch has been tightened too far downwards to the floor (because of the amount of play in the adjustment track) and the throttle plunger isn't actuating the switch enough. This happened to me while i was making adjustments to mine and I had to wiggle the throttle control up and down to get the gear up alarm to turn off even at full throttle.

With the plane off, you can easily pull the throttle full closed, then slowly push it in until about halfway and you should be able to hear a very distinct "click" when the switch activates.  It'll click again when you pull the plunger out.  If you don't hear clicks during those then that's a sign it isn't engaging the switch correctly all the time.

[Hank]

1 hour ago, Matthew P said:

Good evening, I found the switch shortly after buying it as the alarm would go off randomly regardless of throttle position, removed switch, cleaned it then readjusted it...was just looking for info about it as I couldn't find anything in the poh other than the witing diagram..was wanting to see if it mentioned a specific MP setting so when I change out the throttle cable I can make the proper adjustment..it's mentioned in the 20J and 201 poh but not the 20e poh, and the MP settings are different between the J and 201

The answer will be in your Owners Manual, like below for my C:

This was in Section II: Systems Operations, under Insrruments. Your number may be 12", 13" or even 15", I've seen all three listed in various different Manuals. If you have the push-pull throttle, you have easy access to adjust the alarm point, in my C it is inside the throttle quadrant, and access is painstaking.

[Matthew P]

5 hours ago, RescueMunchkin said:

What info are you looking for on it? It's a little switch that's clamped to the throttle cable plunger housing behind the cluster on the non quadrant planes. I found mine a big pita to adjust because of getting the angle of screwdriver and socket behind the gaps for access. I believe the switch is open when the throttle plunger is pulled back past a certain point to break the circuit and activate the alarm.

Good evening, I found the switch shortly after buying it as the alarm would go off randomly regardless of throttle position, removed switch, cleaned it then readjusted it...was just looking for info about it as I couldn't find anything in the poh other than the witing diagram..was wanting to see if it mentioned a specific MP setting so when I change out the throttle cable I can make the proper adjustment..

[Matthew P]

Thanks guys, I see it now, not sure how I missed it.

[1964-M20E]

I suspect Mooney did this on the ground some how.  Maybe they jumped the gear position switch.  Short of that start the plane on the ramp set throttle 12 to 13"MP and lock in place shutdown the engine.  Move plane into hangar, place on jacks, retract the gear and adjust throttle position SW until the horn comes on.  Cycle the gear couple of times to verify.

[Matthew P]

51 minutes ago, 1964-M20E said:

I suspect Mooney did this on the ground some how.  Maybe they jumped the gear position switch.  Short of that start the plane on the ramp set throttle 12 to 13"MP and lock in place shutdown the engine.  Move plane into hangar, place on jacks, retract the gear and adjust throttle position SW until the horn comes on.  Cycle the gear couple of times to verify.

Great idea, thank you

[CaptainRamius]

Replaced last annual. Mounted behind left firewall.  Gear up/throttle back to I think 14" HG it beeps.  Made buy Sonalert.  Sonalert Warning Horn (box looked like it had been on shelf for 50 years.  I have a 65 M20C. Check AC Spruce, LASAR or?