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Topic: bonehead mistake may have overheated bulb?
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Jack Ondracek
Film God
![](http://www.film-tech.com/ubbmembers/1466.jpg)
Posts: 2348
From: Port Orchard, WA, USA
Registered: Oct 2002
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posted 08-09-2008 10:07 PM
I had somewhat of a catastrophe last week. One of my exhaust fans quit, which caused a damper to close, pretty much sealing up the lamphouse. By the time I caught it, the whole back support assembly had melted. It took over an hour before I could touch anything in there.
Big Sky overnighted a new assembly. I had to take a blowtorch to the back of the bulb (well wrapped) to get it out of the lamphouse. Everyone's amazed the thing didn't blow up, taking a glass reflector with it.
Live and learn... The internal blower in the Big Sky L5 has a vane switch, but there's nothing in the stack. I did a "safety workaround", I thought, by using the exhaust fan's 120 volt supply to feed the control input of the power supply. The idea was, no voltage to the fan, no control voltage for the lamphouse. I didn't plan for what would happen if the fan motor conked out.
After looking the bulb over, I decided to retire it. It was new this year, which might be the only thing that kept it from exploding.
Haven't bought a separate vane switch in a long time. Wonder if that Christie switch can be fitted on a Big Sky??
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Jack Ondracek
Film God
![](http://www.film-tech.com/ubbmembers/1466.jpg)
Posts: 2348
From: Port Orchard, WA, USA
Registered: Oct 2002
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posted 08-10-2008 01:19 AM
I appreciate you thought, Jeremy. What makes me nervous about running that bulb is the reflector. It's glass, and about $2,000. If I lose a bulb (which I've already replaced), I'd have to add the cost of the reflector, too.
The wife says, if I put that bulb in and it blows, the cost comes out of my avgas budget. That's about 42 hours of flying, at today's prices.
Wife wins!
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