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A Douglas DC-3 plane is suspending by 3 sling wires to the ceiling I beams 
at the Hong Kong Science Museum.  The plane weights around 7000Kg without 
internal decoration and equipment, except the propellers and their 
engines.  

However, we are told to have replacement of sling wires twice a year.  
Unfortunately, we have to close down the whole area during the working 
period and it will have lesser exhibits available to visitor.  Though the 
legal requirement of inspecting sling wire will be different from place to 
place.  Nevertheless, I am wondering how is the inspection or survey 
program in other museums that have similar heavy hanging objects?    

Thank you for your information.

CK WONG
Senior Technical Officer (Operation and Maintenance)
Hong Kong Science Museum

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