skullcap Posted June 12, 2004 Report Share Posted June 12, 2004 VR; That a/c had a bleed valve tach box failure, this was not detected for two years due to everyone thinking that the pilot had vortex ring. The truth came out when the company which bought the wreck went to overhaul the tach box and found that a diode had burnt out. If the driver had had some gauges in the floor he would have be able to tell that the bleed valve had not closed and topped the engine which caused the low rotor problem. He thought that his engine had failed like had happened not too long before to a sister ship, lowered collective and pulled at the bottom, walked away sans helicopter. Shoulder harness and helmet saved his life, floor of cabin buckled, cabin roof broke open, was not pretty. His story was true and no one would believe him, I did because I was there to do the investigation, he had dropped one of the bags already and was heading off to drop another when the rotor rpm decayed, pretty hard to get into VR state on takeoff over flat terrain. The bags were all on top of each other but there was one that was not hooked to carousel and under all the rest, showing that infact he had released one bag. Kodiak data showed average rate of descent on final to be under 300 fpm as well. Seemed like no brainer to me but the investigation was dropped as was easier and cheaper to blame the pilot for VR state. Lesson-do not stop the investigation unless you are COMPLETELY satisfied with the results. sc Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.