Electronic Lamp Dimmer AA5-B: Difference between revisions
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An exact replacement for the the high-power rheostat that controls the lighting in our planes hasn't been available for years. When mine became intermittent, I decided to install an electronic dimmer and obtain field approval via 337. | An exact replacement for the the high-power rheostat that controls the lighting in our planes hasn't been available for years. When mine became intermittent, I decided to install an electronic dimmer and obtain field approval via 337. | ||
I chose the model [http://www. | I chose the model [http://www.bandc.biz/dimmerinstallation30a14v.aspx] available through [http://www.bandcspecialty.com/index.html B and C Specialty] because it seemed well designed and engineered (by guru Bob Nuckolls of [http://www.aeroelectric.com Aeroelectric Connection]) and moderately priced. My friend Steve Williams and I did the installation, which was surprisingly easy. Our work was inspected by my IA, who obtained an unremarkable field approval. | ||
One item in the 337 parts description needs explanation: why overkill on the dimmer control (I used a 2-watt potentiometer)? Well, to maintain authenticity I wanted to reuse the orginal knob from the rheostat, but found that its shaft was far too large for the 1/2-watt potentiometer I had intended to use. So, I bought the smallest potentiomter whose shaft fit the knob--which turned out to be a 2-watt model. Even if you don't care about using the factory knob, I'd ''still'' recommend using a potentiometer with a large shaft, because a smaller shaft will wallow in the over-sized panel hole, which no IA in his right mind would approve. | One item in the 337 parts description needs explanation: why overkill on the dimmer control (I used a 2-watt potentiometer)? Well, to maintain authenticity I wanted to reuse the orginal knob from the rheostat, but found that its shaft was far too large for the 1/2-watt potentiometer I had intended to use. So, I bought the smallest potentiomter whose shaft fit the knob--which turned out to be a 2-watt model. Even if you don't care about using the factory knob, I'd ''still'' recommend using a potentiometer with a large shaft, because a smaller shaft will wallow in the over-sized panel hole, which no IA in his right mind would approve. | ||
Revision as of 15:42, 3 September 2014
An exact replacement for the the high-power rheostat that controls the lighting in our planes hasn't been available for years. When mine became intermittent, I decided to install an electronic dimmer and obtain field approval via 337.
I chose the model [1] available through B and C Specialty because it seemed well designed and engineered (by guru Bob Nuckolls of Aeroelectric Connection) and moderately priced. My friend Steve Williams and I did the installation, which was surprisingly easy. Our work was inspected by my IA, who obtained an unremarkable field approval.
One item in the 337 parts description needs explanation: why overkill on the dimmer control (I used a 2-watt potentiometer)? Well, to maintain authenticity I wanted to reuse the orginal knob from the rheostat, but found that its shaft was far too large for the 1/2-watt potentiometer I had intended to use. So, I bought the smallest potentiomter whose shaft fit the knob--which turned out to be a 2-watt model. Even if you don't care about using the factory knob, I'd still recommend using a potentiometer with a large shaft, because a smaller shaft will wallow in the over-sized panel hole, which no IA in his right mind would approve. The 337 for the Aero Electric Connection lam dimmer is at:
http://www.campbells.org/Airplanes/337s/index_Airplanes337s.html
