I learned about Maintenance from that . .
On one of the safety posters, that used to be around the hangar, was the slogan 'Don't Assume,
Check! If we're honest we've all assumed at sometime or other. 'Familiarity breeds contempt' is very true.
A Sgt armourer nearly killed himself, carrying out pull-off checks on the seat -pan handle. He took another armourer's word that the cartridges had been removed. It was the nav's seat on a PR9 and luckily he was thrown back, away from the seat. The laid down safety procedures had been severely ignored!