Extract from a wing manual
"IN REGULAR CONDITIONS OF USE* A COMPLETE OVERHAUL OF THE
WING IS ESSENTIAL EVERY 150 FLYING HOURS** AND AFTER ANY HEAVY
LANDING. THIS OVERHAUL INCLUDING COMPLETE SAIL AND STRUCTURE
DISMANTLING, REPLACEMENT OF ALL SCREWS AND NUTS AND A
SYSTEMATIC CONTROL, MUST BE CARRIED OUT IN OUR WORKSHOPS OR
IN AN AUTHORIZED TECHNICAL STATION***. IT IS NECESSARY FOR
SAFETY.
* A peculiar use (mountain, tropics, sea environments and rough
fields) requires a superior frequency, i.e. every year and every
100 hours.
Or at least every two years if the wing flies less than 150 hours.* Whose operators follow a specific technical training in ourworkshops. An updated list is available on demand."
What does this entail and what does it cost?
