A 54-year-old man sustained serious injuries after falling 30ft from a factory roof.
The man, who had been working on the roof of the factory, near Daventry, on Monday, suffered chest, facial and head injuries as well as a fracture to his leg.
Derbyshire, Leicestershire & Rutland Air Ambulance (DLRAA) attended the incident, administering pain relief and anti-sickness drugs to the casualty.
They then put a splint on the fractured leg and immobilised the patient to prevent further movement and damage, before flying him to University Hospital Coventry and Warwickshire.
For more information about DLRAA and WNAA visit www.theairambulanceservice.org.uk.