Anyone Know What This Does?

[ArtVandelay]

13 hours ago, jetdriven said:

I ran a wire from the gear switch to the davtron clock so it indicates an approximation of flight time....it counts when the gear handle is up..

That's funny you mention this. I had the "brilliant" idea to tie gear switch to my KT74 to use as switch to tell it when I'm off the ground instead of an airspeed switch. My avionics guys said no way!

[Yetti]

1 hour ago, Marauder said:

 

Just like the button we have on our 75 yokes?


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Nope the thottle button is fire button.  but you have to be able to select ordnance some how

[kerry]

3 hours ago, Marauder said:

 

We know it isn't that. There is a button on the co-pilot's yoke.


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Not PTT to outside frequency.  Try turning the intercom squelch down to the point where you don't hear each other talking on the head sets.  Then push the button and talk.  This is how you wire an intercom for open cockpit or loud noise airplanes.

[jetdriven]

2 hours ago, teejayevans said:

That's funny you mention this. I had the "brilliant" idea to tie gear switch to my KT74 to use as switch to tell it when I'm off the ground instead of an airspeed switch. My avionics guys said no way!

Becuase your transponder will go to ground mode when you put the gear down, not such a good idea. A squat switch is a better idea, but the wiring is more difficult to access. 

But a clock, it's not too critical. 

[peevee]

Is it Jose's old airplane? Might be the piss tube extension switch 

[carusoam]

The only other buttons I can think of that the O might have...

1) CWS - Control wheel steering.  A temporary disconnect of the AP. A black button.

2) AP disconnect.  A complete disconnect of the AP. A red button. Pushing this gives a beep as it releases control pressures.

These are yoke mounted buttons for KAP and KFC APs...

See if there is a log entry regarding the button at the time the AP was installed?

 

Thinking inside the box....  

Each piece of avionics possibly has functions that many of us can be unaware of. Not so much for the old analog radios.  But, Digital devices can have several ways of flip/flopping things...  like the simple king ADF with trip timer and a secondary timer...

3) FF totalizer reset...?

4) consider anything with a clock/timer in it.

5) consider anything with a popular goto function.  Like 1200 on the XPDR or 121.5 on the radio.

6) if the button were attached to a complex contactor device it could be switching nav data sources from Nav1 to Nav2 for the HSI.

7) wings level, or auto land. 

8) push the button and listen for things like 'traffic nearby' or 'bombs away' this may be a switch to allow something to connect to the intercom, or releasing something from the one piece belly mod...

9) does the XPDR have an auto ALT function with gear up?

10) know that a few previous owners have added every existing available feature. Others have left their JPI, not connect to their FF and GPS... 

 

That's My PP top 10 list for the day...

Also...

Can you tell if the switch is on/off or temporary? 5v or 12v? does the status change with the gear switch.

Best regards,

-a-

[Piloto]

It appears that it is used to activate an optional function when in the air. Check under back seats cushions for waste disposal bay doors.

José 

[1964-M20E]

I have a similar switch installed on mine it activates and changes modes on the Stec 30 AP system.

 

 

[RobertGary1]

Is this the gear horn test button?

 

-Robert

[bonal]

Has your friend tried pushing it and seen if anything happens. I wonder what would be safer in the air or on the ground. I would be very suspicious of any after market switch connection to landing gear system. Maybe smart to put up on stands a cycle the gear. You might also check inside the headliner there might be a chute packed in there and switch deployes and drops the gear.

[Marauder]

5 hours ago, bonal said:

Has your friend tried pushing it and seen if anything happens. I wonder what would be safer in the air or on the ground. I would be very suspicious of any after market switch connection to landing gear system. Maybe smart to put up on stands a cycle the gear. You might also check inside the headliner there might be a chute packed in there and switch deployes and drops the gear.

Nah, the chicken went flying yesterday and told me he didn't have the guts to push it in flight. I reckon he wants me on board to push the button and take the blame. I'm leaning towards the ADF timer theory myself. One end of the wire was headed towards the back of the ADF. We'll figure it out. I hope.

[jlunseth]

I also have a flight timer reset button connected to the ADF and it works well.  I thought that suggestion was a silly idea at first, but it makes sense if you don't want the flight timer to start running until you have some speed up during the takeoff roll.  The squat switch activating might have the same effect as hitting the reset button.  My timer starts earlier, probably as soon as the engine is started, so if I am going to use it for a flight where accuracy is needed, I have to remember to reset it when I start the takeoff roll.

[Hank]

I start timing when my I begin moving for the purpose of flight, which is when I start moving after engine start. At my uncontrolled home field, this can be as little as 2-3 minutes before takeoff; at busy commercial fields, it has been as long as 15-20 minutes before takeoff.

But you can start timing whenever you want . . .

[ArtVandelay]

My GTN and KT74 both have automatic flight timers, GP does as well and automatically creates a log entry, I configured it to add 12 minutes for taxiing.

[RobertGary1]

I hooked my hobbs to a signal line in the back of the alternator made for this purpose. So if the alternator is putting out the hobbs runs.

 

-Robert

[Guest]

53 minutes ago, RobertGary1 said:

I hooked my hobbs to a signal line in the back of the alternator made for this purpose. So if the alternator is putting out the hobbs runs.

 

-Robert

Wouldn't it make sense to power the Hobbs meter from an airspeed switch of some type?

Clarence

[Guitarmaster]

On 12/11/2016 at 10:01 AM, Yetti said:

Nope the thottle button is fire button.  but you have to be able to select ordnance some how

Ordinance selector.... I always wondered what that other button on the yoke was for!  Love me some Mooneyspace!!

[carusoam]

The mid 90s King ADF has a timer that comes on when the ADF powers up.  It has a second flight timer that requires a button on its face to be pushed...

Just sayin'

-a-

[ArtVandelay]

2 hours ago, M20Doc said:

Wouldn't it make sense to power the Hobbs meter from an airspeed switch of some type?

Clarence

If you were renting your plane, where would you hook the hobbs to?  

Me, I just hook it to the master.

[Hank]

I don't rent out my plane--it's got no Hobbs.

[thinwing]

On 12/11/2016 at 10:55 AM, peevee said:

Is it Jose's old airplane? Might be the piss tube extension switch 

No that is his orgasmotron...very useful