sentences:  During a run in a test cell one power section developed a major oil leak and an attempt to shut it down failed because the engine carried on running on the leaking oil.After many attempts to shut it down the offending power section could only be shut down by destroying the compressor with buckets of nuts and bolts thrown down the intake, proving the de-coupling system.First flight test of the T40 was in the Convair XP5Y flying boat on 18 April 1950 fitted with four T40-A-4 developing .