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the argument was if the FTH depends on the density altitude or the pressure altitude
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First of all there was no argument. You are the sole voice of discontent. The engine sees density.
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FTH depends on pressure altitude
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FTH depends on density altitude. Only in an engine equipped with a density controller will it reflect just pressure altitude. AFAIK, they did not have them in WWII.
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If a turbo engine is rated at 310 HP up to 18,000', the altitude specified is pressure altitude?
False, the altitude specified is density altitude
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http://quizlet.com/2496371/print/