I've always done it this way!
the following pages can be found an example of what happens when
we do not pay attention to detail, and do not follow instructions
KC-135 Aircraft was being pressurized at ground level. The outflow
valves which are used to regulate the pressure of the aircraft were
capped off during a 5 year overhaul and never opened back up. The
post-investigation revealed: that a civilian depot technician who,
"had always done it that way," was using a homemade gauge,
and no procedure.
technician's 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. As the technician continued to
pressurize the aircraft, and as the needle was on its second trip
around the gauge the aircraft went "boom" - the rear hatch
was blown over 70 yards away, behind a blast fence!
no one was reported as being injured.
was a good "Lessons Learned" for making sure we have trained
people, who have the right tools, and who are following detailed
procedures. And it should serve as a reminder that just because
you've always done it that way, it does not make it the "right"