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Old 05-03-2016, 06:41 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 933
Default FlightCom 403 Intercom Quit Working...

The FlightCom 403 in my RV-12 quit working. I removed the unit from the panel and heard something loose inside. I took off the top cover plate and discovered a nut and insulator bushing the holds a power transistor heatsink vibrated loose and fell on the circuit board. The remaining screw without its insulator allowed the power transistor to short-circuit against the metal case. The real problem is when the 403 quits working it prevents audio from the comm radio to reach the headsets.

A new (used) 403 is now on order and I will remove the top cover plate and put some adhesive on the exposed thread to prevent recurrence.

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Jim Stricker
Hinckley, Ohio
PPL/ASEL 1970 Sport Pilot since 2004
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC Jul 2012 - Bought Flying Oct 2015 with 48TT - Hobbs now 370

LSRM-A Certificate 2016
Special Thanks to EJ Trucks
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  #2  
Old 05-03-2016, 09:02 PM
Harvey rv12 Harvey rv12 is offline
 
Join Date: Apr 2015
Location: Seattle
Posts: 149
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Wow, great diagnosis!, to bad it fried the board.
Where did you find the used one?.
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Tom O.
RV-12, bought flying
Hoskins Field, 44T
Olympia WA

the bitterness of poor quality
lingers long after the cheap
price is forgotten.
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  #3  
Old 05-03-2016, 09:15 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 933
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eBay - $90.00 shipped
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Jim Stricker
Hinckley, Ohio
PPL/ASEL 1970 Sport Pilot since 2004
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC Jul 2012 - Bought Flying Oct 2015 with 48TT - Hobbs now 370

LSRM-A Certificate 2016
Special Thanks to EJ Trucks
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  #4  
Old 05-03-2016, 09:33 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,245
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The only time I ever lost comms was when my alternator and battery went out on my Cherokee. Naturally it was the one time I had left my portable comm at home. I shut off everything but the XPDR and had enough juice to squawk 7600 and fortunately got a steady green from the tower. Fortunate because I pretty much forgot all the other light signals! When selecting 7600 I inadvertently went thru 7500 which woke up the boys in PHX TRACON.
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