MajorGoofinoff(at)aol.com
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 Posted: Fri Feb 10, 2006 5:01 pm Post subject: Yak Stuck Out... It's a BAD relay! |
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OK,
Here is the answer as to why my Yak would not fire the booster coil or the Air Solenoid.
The IGNITION RELAY -TKE52- in the relay box at station 6 is BAD.
The relay box is located behind the rear instrument panel. I disconnected the instrument air and power lines then removed the center instruments. If you have not notice when you undo the two thumb screws at the top of the instruments the panel will fold down and out. Down on the left and right hinges that the panel rotates on, you will find that each has a removable pin. This will allow you to pull the complete instrument package out of the way, with the exception of the heading compass. Just remove the three screws holding it in, and leave it there.
The relay box is located in the upper right hand side. Has two cannon plugs on the bottom, one large and one small, and lots of Russian safety wire. Remove the two cannon plugs, then remove the four screws holding the box to the bulkhead. Take box out and cut safety wire. Once you have done all of this, getting to the relay inside is easy.
After I sorted out what was what on the relay I reconnected the cannon plugs and powered up the airplane. Just as I expected my multi-meter show that 28 V power from the 10 Amp ignition breaker switch (the one down by the battery switch) was feeding into the relay and was ready and waiting to power the air solenoid and shower of sparks.
. Next I checked that each starter button when pressed would send power to the relay and they worked fine. From the bench check I did I suspected that the starter button power was not making it through the relay and in turn was not pulling the relay closed. I checked the ground terminal to make sure that the wire had good continuity and of course it did.
Only one thing left to due and that was jump the 28 V feed line to the air solenoid line. When I turned on the battery and flipped the ignition switch on the air solenoid made that lovely POP and sent air to spin the prop.
After having pulled this box, I would not want to do this in the field. I will keep that extra booster coil with the pig tail handy. Once you got the tool, its a quick fix.
Scott.
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