I did an EC155 flight around the Niger Delta once, with the outgoing Chairman of Shell, with his wife - he was doing a tour of the various Shell BUs before he retired. After landing I did a post flight inspection, and discovered that the fenestron hub was completely loose. It was exactly like a car wheel, when you are changing the tyre, and it's jacked up and the nuts are loosened. It transpired that the attachment bolts were torqued against paint and reverse wire locked. This was in the era that Eurocopter factory staff still drank beer and wine in the staff canteen for lunch......