blaine beaven Posted November 24, 2014 Report Posted November 24, 2014 Hi, I recently bought a 78J. In the pilot yoke, right horn there is a white button labelled map light. It pushes in and spins. When I depress it or spin it no light comes on. I am guessing the bulb is burned out. What I am wondering is where the bulb is located, so I can change it. Thanks! Blaine Sent from my iPhone using Tapatalk Quote
jfdez Posted November 24, 2014 Report Posted November 24, 2014 The bulbs is in the yolk itself. Shines from below it. Quote
kevinw Posted November 24, 2014 Report Posted November 24, 2014 I had the same issue when I bought my J. Looked all over for it. Turned out the light was actually on, just very dim and unnoticeable in daylight. Quote
blaine beaven Posted November 24, 2014 Author Report Posted November 24, 2014 Ok thanks. I have flown it at night and haven't seen it on or light up, so I am guessing it is burnt out. I've noticed a small hole in the bottom of the yoke... something to investigate next summer, when it isn't freezing out! Quote
M20F-1968 Posted November 24, 2014 Report Posted November 24, 2014 If it is like mine, the nav lights also must be on for it to operate. John Breda 1 Quote
OR75 Posted November 24, 2014 Report Posted November 24, 2014 You access the bulb by removing the front Mooney placard/cover in the front of the yoke . Helps to read paper sitting on your laps if you still do that. Quote
dcastor Posted November 25, 2014 Report Posted November 25, 2014 Great topic... I've wondered about this button myself, but as I've had other issues to worry about this one didn't yet reach the point where it concerned me. I'll have to try it with the nav lights on and in the dark. 1 Quote
PTK Posted December 4, 2014 Report Posted December 4, 2014 Is there an LED replacement for this bulb? Quote
kortopates Posted December 4, 2014 Report Posted December 4, 2014 Is there an LED replacement for this bulb? Yes, you can get LED versions of the bulb from Spruce or any of the big electronic outlets (Mouser, Digikey, Newark etc). I use an LED bulb in my yoke light. Often the map light stops working when the bulb is still good. The base of the bulb can get a little corroded; especially within a loose socket that just needs a little finger tightening. Sometimes the entire bulb and screw in circular metal retainer both fall out together onto the floor and become lost. Plus its not unusual for the pilot to have no idea what the little retainer found on the floor belongs too and then it never finds its way back before becoming permanently lost and forgotten. So if you don't see a bulb, and just an open whole, look all around the cockpit floor carefully and you might get lucky. Quote
LANCECASPER Posted December 22, 2014 Report Posted December 22, 2014 Any idea what the GE or led part number is on this bulb? Quote
LANCECASPER Posted December 22, 2014 Report Posted December 22, 2014 Ok, I'll answer my own question. It looks like this part number (11-09629) from Aircraft Spruce (LED Replacement) will replace the map lights in the yoke and the landing gear indicator light on the floor also. I'll know for sure when I get them in a few days. Quote
BorealOne Posted December 23, 2014 Report Posted December 23, 2014 And what part number was that? Quote
LANCECASPER Posted December 23, 2014 Report Posted December 23, 2014 And what part number was that? 11-09629 1 Quote
OR75 Posted December 23, 2014 Report Posted December 23, 2014 Is the led light much brighter than the incandescent ? It would be a good feature for the gear indicator Quote
Rustler Posted December 24, 2014 Report Posted December 24, 2014 Might look at https://www.superbrightleds.com/search/led-products/T1-3%204/. Quote
LANCECASPER Posted December 25, 2014 Report Posted December 25, 2014 Might look at https://www.superbrightleds.com/search/led-products/T1-3%204/. I did, but the only one that they have that has the correct base is this one: https://www.superbrightleds.com/moreinfo/subminiature-bulbs/led-product/11/ It should work for Mooneys with 12v systems, but I couldn't find one for 24v, which is what I needed. Quote
LANCECASPER Posted December 29, 2014 Report Posted December 29, 2014 Ok, I'll answer my own question. It looks like this part number (11-09629) from Aircraft Spruce (LED Replacement) will replace the map lights in the yoke and the landing gear indicator light on the floor also. I'll know for sure when I get them in a few days. The LED map lights came in from Aircraft Spruce and I replaced the pilot's side. Make a big difference in the amount of light plus should never have to be replaced. Next I want to replace the one in the Gear Down indicator. Quote
DonMuncy Posted December 29, 2014 Report Posted December 29, 2014 For you guys talking about the gear down indicator light, bear in mind that the K model book (erroneously in my opinion) call for a 28 volt bulb for 12 volt planes. On my plane, even though the light functioned, it was so dim as to be totally useless. I replaced it with the 12 volt equivalent, and it is now great. 1 Quote
NotarPilot Posted January 14, 2015 Report Posted January 14, 2015 I am missing the little assembly that screws in under the yoke and holds the bulb in place. Is this a metal piece? And does anyone think it could be 3D printed with plastic? Quote
LANCECASPER Posted January 15, 2015 Report Posted January 15, 2015 I think you'll find something that will work here: http://sloanled.com/indicators/downloads/SloanLEDIndicatorsCatalog.pdf Quote
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