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Aircraft Pressure Check
Dangers
Take a look at this aircraft that was over pressurized at ground level.
The outflow valves which are used to maintain the pressure of the aircraft
were capped off during a 5 year overhaul and never opened back up. The
post-investigation on this one revealed...one of the causes was a civilian
depot technician who, "had always done it that way," was using a
homemade gauge, no T.O. In fact, his gauge didn't even have a max
"peg" for the needle and so it was no surprise he missed it when
the needle went around the gauge the first time. Now, as the technician
continued to pressurize the aircraft, and as the needle was on its second
trip around the gauge, the aircraft ruptured. The rear hatch was blown
over 70 yards away, behind a blast fence!
  
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