Kamis, 27 Juni 2013

How can someone lose both arms when a blackhawk tyre explodes? (Apparently this happened in Iraq)?

pressure washer accident on Power Washers for Transportation clean up
pressure washer accident image



Mark in Ja


This happened in Iraq according to a news article I read today. And another soilder was killed in the same incident. The helicopter was apparently on the ground.


Answer
This happened in my unit (E COMPANY 5-158th AVN) while I was downrange in OIF1 (2003-2004). The contributing factors were as follows......

1. The soldiers in question (1 of died in the incident, while one only lost both arms) were servicing (filling the tire with pressurized nitrogen)a main landing gear tire on a UH60A Blackhawk helicopter. They did not follow the proper procedures, which are clearly stated in the servicing manual (TM1-1520-237-23-1)

2. Soldier A (the fatality) was kneeling next to the tire, directly in front of the rim, instead of off to the side.

3. Soldier B (the one who lost his arms) was operating the tire inflation kit with his arms extended between the rim and the other soldier.

4. The UH60 uses a split rim design, which means the rim is two pieces (picture a car rim cut down the center vertically) held together (in the case of this rim) by 7 bolt, washer, and nut setups.

5. The nitrogen servicing cart has a low and a high pressure side, the low pressure side is capable of 50-300psig (pounds per square inch, guaged), while the high pressure side is capable of 150-3,000psig. When servicing a uh60 tire, one must take care to use the low pressure sude, since the tire is only supposed to be inflated to about 150psig.
6. The soldiers hooked the tire inflation kit to the high pressure side of the servicing cart. When they opened the valve on the tank and then tried to service the tire, they shot 3,000 psig into a tire and rim assembly designed for a much, much lower pressure. This overpressure caused the explosive failure of the rim hardware, resulting in the rim blowing apart, directly through Soldier B's arms, and into the chest of Soldier A. Only the quick reaction of a friend of mine did Soldier B manage to live. He used his blet and Soldier B's belt to turniquet the soldier's arms above the elbows. Soldier A was dead almost instantly from catching the rim in the chest at 3,000 pouns per square inch pressure.

While this was a tragic loss to the families involved, it was an accident. I almost made the same mistake myself, thank God, it was caught in time.

small engine problem...HELP??? my dad is going to kill me?




Tyler


I was pressure washing today with my 13 hp Honda washer. I somehow tipped over the machine by accident. It stalled out, and when i tried to start it again, the pull cord doesn't even budge. What could be causing this. After pulling the face plates off i can turn the flywheel almost a full rotation before it stops. Any advice/suggestions would be greatly appreciated.
the engine does turn over...i can see the piston going up and down when i took the spark plug out



Answer
Did you release the water pressure? Squeeze the trigger while it isn't running and let the water flow go to the hose pressure. Many of the pressure washers do not have an auto pressure release when the engine shuts off. With pressure built up it is impossible to pull start the engine.




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