Firstly, I would correct his English and explain that the word is "due" and secondly, I would explain statistics and probability to him!
If I roll a die three times and get sixes each time, what is the probability of me getting a six on the fourth roll?
Assuming I'm running a tight ship anyway (all maintenance and training up to date etc), and that the operation has been accident-free for the last x numbers of years, I would ensure that complacency doesn't set in and that standards are maintained.
Cheers
Whirls