I have 45 years experience as an LAE working with many types and can say with certainty that the 1011 was the most difficult to maintain.It was loved by aircrew as a pilots aircraft but for us it was a nightmare even when new - I have done more landing gear swings than with any other type. When operated with 747s I estimate it took at least 25% more manhours to keep it serviceable - I did not grieve when my company took it out of service.Ask any old hand about mixing ejectors and watch them turn purple!The hydraulic systems were fragile,pneumatics just as bad and the APU was an overcomplicated disaster - easily replaced was its saving grace.Great aeroplane to fly in but to maintain - no thanks.