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YAK-52 gear light

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radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Sat May 29, 2010 6:06 pm Post subject: YAK-52 gear light

Does anyone have the part number for the YAK-52 gear light? I seem to  

remember it being an Osram item.

-Eric W.

viperdoc(at)mindspring.co
Guest

Posted: Sat May 29, 2010 6:32 pm Post subject: YAK-52 gear light

Eric,

Are you referring to the gear indicator light? If so go to auto zone and ask

them for a 24 volt bulb the they carry for the fire departments. Take your

old bulb with you so they can compare the bayonet. I do not remember the

part #.

Doc



--

radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Sat May 29, 2010 6:35 pm Post subject: YAK-52 gear light

Thanks, Doc



On May 29, 2010, at 10:32 PM, Roger Kemp M.D. wrote:



[quote] 

 >



 Eric,

 Are you referring to the gear indicator light? If so go to auto zone  

 and ask

 them for a 24 volt bulb the they carry for the fire departments.  

 Take your

 old bulb with you so they can compare the bayonet. I do not remember  

 the

 part #.

 Doc



 --

dsavarese0812(at)bellsout
Guest

Posted: Sun May 30, 2010 4:42 am Post subject: YAK-52 gear light

Osram OS3899.  Here's an link for them.  http://www.frontierlighting.com/product.jsp?part=2014&process=search&show=&

 [quote]   ---

radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Sun May 30, 2010 5:04 am Post subject: YAK-52 gear light

Thanks, Dennis and Doc.

On May 30, 2010, at 8:41 AM, A. Dennis Savarese wrote:

[quote]Osram OS3899.  Here's an link for them.  http://www.frontierlighting.com/product.jsp?part=2014&process=search&show=&

[quote]---

radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Sun May 30, 2010 2:41 pm Post subject: YAK-52 gear light

Hey, Dennis / Doc... I notice that lamp I took out was 2W (the Osram is 3W)... assuming that's a trivial difference. Also, is that the same lamp as used in the annunciator panel? If not, do you know the lamp part number equivilent for those? 



Lastly, my Hobbs is on the left main gear switch, which is not working... thought it was the switch adjustment, but it seems to be clicking when the up lock is tripped. So, I was guessing it's the switch (didn't put a meter on it yet), but I also wonder if the Hobbs was drawing too much current and tripped a fuse. I don't suppose the three gear indicator circuits are fused separately? 

Thanks again. -Eric



On May 30, 2010, at 8:41 AM, A. Dennis Savarese wrote:

[quote]Osram OS3899.  Here's an link for them.  http://www.frontierlighting.com/product.jsp?part=2014&process=search&show=&

[quote]---

dsavarese0812(at)bellsout
Guest

Posted: Sun May 30, 2010 4:39 pm Post subject: YAK-52 gear light

2W vs. 3W is no problem.  I do not know of a US  equivalent for the annunciator panel lamps.

  

 Push the microswitch button itself.   It should  click very distinctly when you depress the button.  Does the green light go  out when you retract the gear?   Does the lamp come on when you press  the press to lamp test button.  Put an ohm meter on the microswitch if you  suspect it to be bad.  You will have to pierce the wires with the ohm meter  leads.  Getting to the terminal block is a whole lot more  difficult.

  

 Dennis

 [quote]   ---

radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Sun May 30, 2010 5:35 pm Post subject: YAK-52 gear light

The lamp for the gear up is fine (using test button), and the microswitch on the uplock does click when you trip it  or press it. The down and locked light is not an issue (goes out when retracted. Are all gear lights on the same fuse?



On May 30, 2010, at 8:37 PM, A. Dennis Savarese wrote:

[quote]2W vs. 3W is no problem.  I do not know of a US equivalent for the annunciator panel lamps.

 

Push the microswitch button itself.   It should click very distinctly when you depress the button.  Does the green light go out when you retract the gear?   Does the lamp come on when you press the press to lamp test button.  Put an ohm meter on the microswitch if you suspect it to be bad.  You will have to pierce the wires with the ohm meter leads.  Getting to the terminal block is a whole lot more difficult.

 

Dennis

[quote]---

yakplt(at)yahoo.com
Guest

Posted: Sun May 30, 2010 7:30 pm Post subject: YAK-52 gear light

I know Dennis is answering your questions, and his answers are always solid.  

  

 But... what might be interesting is to put power on the aircraft and then have someone click the up and lock switch and see if the up and locked light comes on, and the Hobbs meter starts running.  If it does.. that kinda means there might be nothing wrong with the switch at all, and either it is out of adjustment, or... the gear is actually not going all the way up.  In other words, it might actually be telling you the truth.  The switch has nothing at all to do with the gear going up or down, so there is no safety risk I can think of doing that.  

  

 Not likely, but always a remote possibility. 

  

 Mark

 



--- On Sun, 5/30/10, Eric Wobschall <eric(at)buffaloskyline.com> wrote:



 [quote]

From: Eric Wobschall <eric(at)buffaloskyline.com>

Subject: Re: YAK-52 gear light

To: yak-list(at)matronics.com

Date: Sunday, May 30, 2010, 9:28 PM



 The lamp for the gear up is fine (using test button), and the microswitch on the uplock does click when you trip it  or press it. The down and locked light is not an issue (goes out when retracted. Are all gear lights on the same fuse?  

 



 

  On May 30, 2010, at 8:37 PM, A. Dennis Savarese wrote:

 [quote]  2W vs. 3W is no problem.  I do not know of a US equivalent for the annunciator panel lamps.

  

 Push the microswitch button itself.   It should click very distinctly when you depress the button.  Does the green light go out when you retract the gear?   Does the lamp come on when you press the press to lamp test button.  Put an ohm meter on the microswitch if you suspect it to be bad.  You will have to pierce the wires with the ohm meter leads.  Getting to the terminal block is a whole lot more difficult.

  

 Dennis

 [quote] ---

radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Sun May 30, 2010 7:54 pm Post subject: YAK-52 gear light

Worth a try, Mark... Thanks...

On May 30, 2010, at 11:26 PM, Yak Pilot wrote:

[quote]I know Dennis is answering your questions, and his answers are always solid.  

  

 But... what might be interesting is to put power on the aircraft and then have someone click the up and lock switch and see if the up and locked light comes on, and the Hobbs meter starts running.  If it does.. that kinda means there might be nothing wrong with the switch at all, and either it is out of adjustment, or... the gear is actually not going all the way up.  In other words, it might actually be telling you the truth.  The switch has nothing at all to do with the gear going up or down, so there is no safety risk I can think of doing that.  

  

 Not likely, but always a remote possibility. 

  

 Mark

 



--- On Sun, 5/30/10, Eric Wobschall <eric(at)buffaloskyline.com (eric(at)buffaloskyline.com)> wrote:



 [quote]

From: Eric Wobschall <eric(at)buffaloskyline.com (eric(at)buffaloskyline.com)>

Subject: Re: YAK-52 gear light

To: yak-list(at)matronics.com (yak-list(at)matronics.com)

Date: Sunday, May 30, 2010, 9:28 PM



 The lamp for the gear up is fine (using test button), and the microswitch on the uplock does click when you trip it  or press it. The down and locked light is not an issue (goes out when retracted. Are all gear lights on the same fuse? 

 



 

  On May 30, 2010, at 8:37 PM, A. Dennis Savarese wrote:

 [quote]  2W vs. 3W is no problem.  I do not know of a US equivalent for the annunciator panel lamps.

  

 Push the microswitch button itself.   It should click very distinctly when you depress the button.  Does the green light go out when you retract the gear?   Does the lamp come on when you press the press to lamp test button.  Put an ohm meter on the microswitch if you suspect it to be bad.  You will have to pierce the wires with the ohm meter leads.  Getting to the terminal block is a whole lot more difficult.

  

 Dennis

 [quote] ---

dsavarese0812(at)bellsout
Guest

Posted: Mon May 31, 2010 3:57 am Post subject: YAK-52 gear light

Have you adjusted the arm that engages the button on the micro  switch as Mark suggested?   What about putting an ohm meter on the  micro switch to verify operation?  There is no common fuse because if there  was and the fuse was blown, all of the gear lights would be out.

 Dennis

 [quote]   ---

radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Mon May 31, 2010 4:35 am Post subject: YAK-52 gear light

Got it...I'll check all of that...

On May 31, 2010, at 7:56 AM, A. Dennis Savarese wrote:

[quote]Have you adjusted the arm that engages the button on the micro switch as Mark suggested?   What about putting an ohm meter on the micro switch to verify operation?  There is no common fuse because if there was and the fuse was blown, all of the gear lights would be out.

Dennis

[quote]---

radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Mon May 31, 2010 4:36 am Post subject: YAK-52 gear light

I thought the switch was depressed with the gear extended. With the common (to all gear lights) circuit you described, it's either adjustment or switch, and since it seems to have clicked on extension, I'm guessing switch. I'll put a meter on it.



Thanks.



On May 31, 2010, at 7:56 AM, A. Dennis Savarese wrote:

[quote]Have you adjusted the arm that engages the button on the micro switch as Mark suggested?   What about putting an ohm meter on the micro switch to verify operation?  There is no common fuse because if there was and the fuse was blown, all of the gear lights would be out.

Dennis

[quote]---

mark.bitterlich(at)navy.m
Guest

Posted: Tue Jun 01, 2010 9:07 am Post subject: YAK-52 gear light

Now I am confused.... 



My memory says that there are two switches.  One for down and locked,

the other for up and locked.  



Which one is your hobs meter hooked to, and which light exactly is not

working?  



I was under the impression that you were wired into the UP and locked

switch.  



Mark

   



--

radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Tue Jun 01, 2010 1:53 pm Post subject: YAK-52 gear light

Yeah, I'm confused, too. I can hear the Hobbs ticking when the up-lock  

is tripped, but the light doesn't light. The light DOES light when I  

depress the test button (this is when the gear light switch and  

battery master are on). I examined the wiring harness where the Hobbs  

is tapped in, and it looks fine (transparent butt splice).



Any theories?

On Jun 1, 2010, at 1:04 PM, Bitterlich, Mark G CIV Det Cherry Point,  

MALS-14 64E wrote:



[quote] 

 Point, MALS-14 64E" <mark.bitterlich(at)navy.mil>



 Now I am confused....



 My memory says that there are two switches.  One for down and locked,

 the other for up and locked.



 Which one is your hobs meter hooked to, and which light exactly is not

 working?



 I was under the impression that you were wired into the UP and locked

 switch.



 Mark

 --

mark.bitterlich(at)navy.m
Guest

Posted: Wed Jun 02, 2010 8:39 am Post subject: YAK-52 gear light

Reason says that if the uplock gets tripped and the Hobbs starts

ticking, then the switch is probably good.  But then we come to the

light not working.  Logic there says that the wire from the switch to

the light must be bad then.  



But not so fast.  



The Hobbs meter is a very VERY low current draw item.  It is possible

that you could have a big voltage drop and the Hobbs meter could still

work.  



There comes a time when test equipment is called for, and this is one of

them.  Make it easy on you to start...   You should be able to get to

the hobbs meter connections fairly easily.  Trip the up and lock switch

and put your DC VOLT METER on the hobbs and read the voltage.  It should

be the same as battery voltage, I.E. about 24 volts.  If this tests

good, you know your switch and wiring is good up to the splice point

that you just examined.  We are then looking at something being wrong

from that splice point up to the bulb assembly.  Dennis has copies of

those schematics, I do not have any handy sorry to say.  Seems to me

something get a little complicated in there somewhere due to the test

and check function of those lights, where a relay is involved, etc.  If

the voltage checks good at the splice point, we are going to need

accurate schematics.  Dennis? 



Mark

--

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