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#1
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Turbo waiting on taxiway. 100+, #8 million in line for takeoff
My one and only rear 'started to thermal runaway' was years ago at Hanscom AFB, when the place had 450+ based aircraft, was DEC helicopters' base, and a wild and wholly place to operate.
One Saturday I was number eight million in line for takeoff, 100+F on the taxiway. The rear engine started to get hotter and hotter. "Uh oh," I thought. I found the trick was to keep about 1,200 RPM or so on the front engine, to drive airflow into the top rear scoop, w flaps open. My turbo has the big juicy flaps and much more open space under the spinner too. Since then all fine, never an issue.
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David Wartofsky Potomac Airfield 10300 Glen Way Fort Washington, MD 20744 
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#2
02-16-25, 09:07 PM
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Experience Skymaster Pilots know, that all you normally have to do is to rev up the front engine once in awhile, when slow taxing in hot weather.
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General Sky Tree top Flying in C336, O2, 337A, P337G with IO-550's
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#3
02-17-25, 12:47 AM
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Thank you Gentlemen; This data on ground management and history is helpful.
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#4
02-17-25, 02:19 PM
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I would say my T337D experience has been the same as mentioned below. For the most part its a non issue, but every so often I find myself in a situation where I have to wait on the ground for a while before takeoff. When this happens its important to face into the wind, even if its an odd orientation. If you are sideways to the prevailing wind, and its above around 5-10 knots it can create a kind of dead air situation in the rear engine and it starts to head towards a thermal runaway. I also keep the engines full rich on the ground so I have unused fuel cooling it as well.
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